From 010dad209a918a900fd640840d700e07ec3cdd7c Mon Sep 17 00:00:00 2001
From: Slavek Kabrda <slavek.kabrda@datadoghq.com>
Date: Thu, 20 Feb 2020 16:13:53 +0100
Subject: [PATCH] [go-experimental] Add model constructors to initialize
 non-container vars with defaults (#5175)

* [go-experimental] Add model constructors to initialize non-container vars with defaults

* Add docstring and extend model_doc to include the constructor

* Make variable names in constructor follow Go naming guidelines

* Provide 2 different constructurs as suggested + couple fixes to generate constructors right under all circumstances

* Fix defaults for enums

* Properly escape vars that have reserved names
---
 .../GoClientExperimentalCodegen.java          | 60 +++++++++++++++++--
 .../resources/go-experimental/model.mustache  | 38 ++++++++++++
 .../go-experimental/model_doc.mustache        | 17 ++++++
 .../docs/AdditionalPropertiesAnyType.md       | 17 ++++++
 .../docs/AdditionalPropertiesArray.md         | 17 ++++++
 .../docs/AdditionalPropertiesBoolean.md       | 17 ++++++
 .../docs/AdditionalPropertiesClass.md         | 17 ++++++
 .../docs/AdditionalPropertiesInteger.md       | 17 ++++++
 .../docs/AdditionalPropertiesNumber.md        | 17 ++++++
 .../docs/AdditionalPropertiesObject.md        | 17 ++++++
 .../docs/AdditionalPropertiesString.md        | 17 ++++++
 .../go-petstore/docs/Animal.md                | 19 +++++-
 .../go-petstore/docs/ApiResponse.md           | 17 ++++++
 .../docs/ArrayOfArrayOfNumberOnly.md          | 17 ++++++
 .../go-petstore/docs/ArrayOfNumberOnly.md     | 17 ++++++
 .../go-petstore/docs/ArrayTest.md             | 17 ++++++
 .../go-petstore/docs/BigCat.md                | 17 ++++++
 .../go-petstore/docs/BigCatAllOf.md           | 17 ++++++
 .../go-petstore/docs/Capitalization.md        | 17 ++++++
 .../go-experimental/go-petstore/docs/Cat.md   | 17 ++++++
 .../go-petstore/docs/CatAllOf.md              | 17 ++++++
 .../go-petstore/docs/Category.md              | 19 +++++-
 .../go-petstore/docs/ClassModel.md            | 17 ++++++
 .../go-petstore/docs/Client.md                | 17 ++++++
 .../go-experimental/go-petstore/docs/Dog.md   | 17 ++++++
 .../go-petstore/docs/DogAllOf.md              | 17 ++++++
 .../go-petstore/docs/EnumArrays.md            | 17 ++++++
 .../go-petstore/docs/EnumTest.md              | 17 ++++++
 .../go-petstore/docs/FakeApi.md               |  8 +--
 .../go-experimental/go-petstore/docs/File.md  | 17 ++++++
 .../go-petstore/docs/FileSchemaTestClass.md   | 17 ++++++
 .../go-petstore/docs/FormatTest.md            | 17 ++++++
 .../go-petstore/docs/HasOnlyReadOnly.md       | 17 ++++++
 .../go-experimental/go-petstore/docs/List.md  | 17 ++++++
 .../go-petstore/docs/MapTest.md               | 17 ++++++
 ...dPropertiesAndAdditionalPropertiesClass.md | 17 ++++++
 .../go-petstore/docs/Model200Response.md      | 17 ++++++
 .../go-experimental/go-petstore/docs/Name.md  | 17 ++++++
 .../go-petstore/docs/NumberOnly.md            | 17 ++++++
 .../go-experimental/go-petstore/docs/Order.md | 17 ++++++
 .../go-petstore/docs/OuterComposite.md        | 17 ++++++
 .../go-experimental/go-petstore/docs/Pet.md   | 17 ++++++
 .../go-petstore/docs/ReadOnlyFirst.md         | 17 ++++++
 .../go-petstore/docs/Return.md                | 17 ++++++
 .../go-petstore/docs/SpecialModelName.md      | 17 ++++++
 .../go-experimental/go-petstore/docs/Tag.md   | 17 ++++++
 .../go-petstore/docs/TypeHolderDefault.md     | 19 +++++-
 .../go-petstore/docs/TypeHolderExample.md     | 17 ++++++
 .../go-experimental/go-petstore/docs/User.md  | 17 ++++++
 .../go-petstore/docs/XmlItem.md               | 17 ++++++
 .../go-petstore/model_200_response.go         | 17 ++++++
 .../model_additional_properties_any_type.go   | 17 ++++++
 .../model_additional_properties_array.go      | 17 ++++++
 .../model_additional_properties_boolean.go    | 17 ++++++
 .../model_additional_properties_class.go      | 17 ++++++
 .../model_additional_properties_integer.go    | 17 ++++++
 .../model_additional_properties_number.go     | 17 ++++++
 .../model_additional_properties_object.go     | 17 ++++++
 .../model_additional_properties_string.go     | 17 ++++++
 .../go-petstore/model_animal.go               | 22 +++++++
 .../go-petstore/model_api_response.go         | 17 ++++++
 .../model_array_of_array_of_number_only.go    | 17 ++++++
 .../go-petstore/model_array_of_number_only.go | 17 ++++++
 .../go-petstore/model_array_test_.go          | 17 ++++++
 .../go-petstore/model_big_cat.go              | 17 ++++++
 .../go-petstore/model_big_cat_all_of.go       | 17 ++++++
 .../go-petstore/model_capitalization.go       | 17 ++++++
 .../go-experimental/go-petstore/model_cat.go  | 17 ++++++
 .../go-petstore/model_cat_all_of.go           | 17 ++++++
 .../go-petstore/model_category.go             | 20 +++++++
 .../go-petstore/model_class_model.go          | 17 ++++++
 .../go-petstore/model_client.go               | 17 ++++++
 .../go-experimental/go-petstore/model_dog.go  | 17 ++++++
 .../go-petstore/model_dog_all_of.go           | 17 ++++++
 .../go-petstore/model_enum_arrays.go          | 17 ++++++
 .../go-petstore/model_enum_test_.go           | 18 ++++++
 .../go-experimental/go-petstore/model_file.go | 17 ++++++
 .../model_file_schema_test_class.go           | 17 ++++++
 .../go-petstore/model_format_test_.go         | 21 +++++++
 .../go-petstore/model_has_only_read_only.go   | 17 ++++++
 .../go-experimental/go-petstore/model_list.go | 17 ++++++
 .../go-petstore/model_map_test_.go            | 17 ++++++
 ...perties_and_additional_properties_class.go | 17 ++++++
 .../go-experimental/go-petstore/model_name.go | 18 ++++++
 .../go-petstore/model_number_only.go          | 17 ++++++
 .../go-petstore/model_order.go                | 21 +++++++
 .../go-petstore/model_outer_composite.go      | 17 ++++++
 .../go-experimental/go-petstore/model_pet.go  | 19 ++++++
 .../go-petstore/model_read_only_first.go      | 17 ++++++
 .../go-petstore/model_return.go               | 17 ++++++
 .../go-petstore/model_special_model_name.go   | 17 ++++++
 .../go-experimental/go-petstore/model_tag.go  | 17 ++++++
 .../go-petstore/model_type_holder_default.go  | 26 ++++++++
 .../go-petstore/model_type_holder_example.go  | 23 +++++++
 .../go-experimental/go-petstore/model_user.go | 17 ++++++
 .../go-petstore/model_xml_item.go             | 17 ++++++
 .../docs/AdditionalPropertiesClass.md         | 17 ++++++
 .../go-petstore/docs/Animal.md                | 19 +++++-
 .../go-petstore/docs/ApiResponse.md           | 17 ++++++
 .../docs/ArrayOfArrayOfNumberOnly.md          | 17 ++++++
 .../go-petstore/docs/ArrayOfNumberOnly.md     | 17 ++++++
 .../go-petstore/docs/ArrayTest.md             | 17 ++++++
 .../go-petstore/docs/Capitalization.md        | 17 ++++++
 .../go-experimental/go-petstore/docs/Cat.md   | 17 ++++++
 .../go-petstore/docs/CatAllOf.md              | 17 ++++++
 .../go-petstore/docs/Category.md              | 19 +++++-
 .../go-petstore/docs/ClassModel.md            | 17 ++++++
 .../go-petstore/docs/Client.md                | 17 ++++++
 .../go-experimental/go-petstore/docs/Dog.md   | 17 ++++++
 .../go-petstore/docs/DogAllOf.md              | 17 ++++++
 .../go-petstore/docs/EnumArrays.md            | 17 ++++++
 .../go-petstore/docs/EnumTest.md              | 21 ++++++-
 .../go-petstore/docs/FakeApi.md               |  8 +--
 .../go-experimental/go-petstore/docs/File.md  | 17 ++++++
 .../go-petstore/docs/FileSchemaTestClass.md   | 17 ++++++
 .../go-experimental/go-petstore/docs/Foo.md   | 19 +++++-
 .../go-petstore/docs/FormatTest.md            | 17 ++++++
 .../go-petstore/docs/HasOnlyReadOnly.md       | 17 ++++++
 .../go-petstore/docs/HealthCheckResult.md     | 17 ++++++
 .../go-petstore/docs/InlineObject.md          | 17 ++++++
 .../go-petstore/docs/InlineObject1.md         | 17 ++++++
 .../go-petstore/docs/InlineObject2.md         | 19 +++++-
 .../go-petstore/docs/InlineObject3.md         | 17 ++++++
 .../go-petstore/docs/InlineObject4.md         | 17 ++++++
 .../go-petstore/docs/InlineObject5.md         | 17 ++++++
 .../go-petstore/docs/InlineResponseDefault.md | 17 ++++++
 .../go-experimental/go-petstore/docs/List.md  | 17 ++++++
 .../go-petstore/docs/MapTest.md               | 17 ++++++
 ...dPropertiesAndAdditionalPropertiesClass.md | 17 ++++++
 .../go-petstore/docs/Model200Response.md      | 17 ++++++
 .../go-experimental/go-petstore/docs/Name.md  | 17 ++++++
 .../go-petstore/docs/NullableClass.md         | 17 ++++++
 .../go-petstore/docs/NumberOnly.md            | 17 ++++++
 .../go-experimental/go-petstore/docs/Order.md | 17 ++++++
 .../go-petstore/docs/OuterComposite.md        | 17 ++++++
 .../go-experimental/go-petstore/docs/Pet.md   | 17 ++++++
 .../go-petstore/docs/ReadOnlyFirst.md         | 17 ++++++
 .../go-petstore/docs/Return.md                | 17 ++++++
 .../go-petstore/docs/SpecialModelName.md      | 17 ++++++
 .../go-experimental/go-petstore/docs/Tag.md   | 17 ++++++
 .../go-experimental/go-petstore/docs/User.md  | 17 ++++++
 .../go-petstore/model_200_response.go         | 17 ++++++
 .../go-petstore/model__special_model_name_.go | 17 ++++++
 .../model_additional_properties_class.go      | 17 ++++++
 .../go-petstore/model_animal.go               | 22 +++++++
 .../go-petstore/model_api_response.go         | 17 ++++++
 .../model_array_of_array_of_number_only.go    | 17 ++++++
 .../go-petstore/model_array_of_number_only.go | 17 ++++++
 .../go-petstore/model_array_test_.go          | 17 ++++++
 .../go-petstore/model_capitalization.go       | 17 ++++++
 .../go-experimental/go-petstore/model_cat.go  | 17 ++++++
 .../go-petstore/model_cat_all_of.go           | 17 ++++++
 .../go-petstore/model_category.go             | 20 +++++++
 .../go-petstore/model_class_model.go          | 17 ++++++
 .../go-petstore/model_client.go               | 17 ++++++
 .../go-experimental/go-petstore/model_dog.go  | 17 ++++++
 .../go-petstore/model_dog_all_of.go           | 17 ++++++
 .../go-petstore/model_enum_arrays.go          | 17 ++++++
 .../go-petstore/model_enum_test_.go           | 26 ++++++++
 .../go-experimental/go-petstore/model_file.go | 17 ++++++
 .../model_file_schema_test_class.go           | 17 ++++++
 .../go-experimental/go-petstore/model_foo.go  | 21 +++++++
 .../go-petstore/model_format_test_.go         | 21 +++++++
 .../go-petstore/model_has_only_read_only.go   | 17 ++++++
 .../go-petstore/model_health_check_result.go  | 17 ++++++
 .../go-petstore/model_inline_object.go        | 17 ++++++
 .../go-petstore/model_inline_object_1.go      | 17 ++++++
 .../go-petstore/model_inline_object_2.go      | 21 +++++++
 .../go-petstore/model_inline_object_3.go      | 21 +++++++
 .../go-petstore/model_inline_object_4.go      | 19 ++++++
 .../go-petstore/model_inline_object_5.go      | 18 ++++++
 .../model_inline_response_default.go          | 17 ++++++
 .../go-experimental/go-petstore/model_list.go | 17 ++++++
 .../go-petstore/model_map_test_.go            | 17 ++++++
 ...perties_and_additional_properties_class.go | 17 ++++++
 .../go-experimental/go-petstore/model_name.go | 18 ++++++
 .../go-petstore/model_nullable_class.go       | 17 ++++++
 .../go-petstore/model_number_only.go          | 17 ++++++
 .../go-petstore/model_order.go                | 21 +++++++
 .../go-petstore/model_outer_composite.go      | 17 ++++++
 .../go-experimental/go-petstore/model_pet.go  | 19 ++++++
 .../go-petstore/model_read_only_first.go      | 17 ++++++
 .../go-petstore/model_return.go               | 17 ++++++
 .../go-experimental/go-petstore/model_tag.go  | 17 ++++++
 .../go-experimental/go-petstore/model_user.go | 17 ++++++
 185 files changed, 3266 insertions(+), 21 deletions(-)

diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/GoClientExperimentalCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/GoClientExperimentalCodegen.java
index 64801956c08..25cab60eba2 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/GoClientExperimentalCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/GoClientExperimentalCodegen.java
@@ -16,6 +16,7 @@
 
 package org.openapitools.codegen.languages;
 
+import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.security.SecurityScheme;
 import org.openapitools.codegen.CodegenModel;
 import org.openapitools.codegen.CodegenProperty;
@@ -23,14 +24,12 @@ import org.openapitools.codegen.CodegenSecurity;
 import org.openapitools.codegen.SupportingFile;
 import org.openapitools.codegen.meta.GeneratorMetadata;
 import org.openapitools.codegen.meta.Stability;
+import org.openapitools.codegen.utils.ModelUtils;
 import org.openapitools.codegen.utils.ProcessUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.Arrays;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 
 import static org.openapitools.codegen.utils.StringUtils.camelize;
 
@@ -97,6 +96,59 @@ public class GoClientExperimentalCodegen extends GoClientCodegen {
         return camelize(toModel(name, false));
     }
 
+    public String escapeReservedWord(String name) {
+        if (this.reservedWordsMappings().containsKey(name)) {
+            return this.reservedWordsMappings().get(name);
+        }
+        return name + '_';
+    }
+
+    @Override
+    public String toEnumDefaultValue(String value, String datatype) {
+        String prefix = "";
+        if (enumClassPrefix) {
+            prefix = datatype.toUpperCase(Locale.ROOT) + "_";
+        }
+        return prefix + value;
+    }
+
+    @Override
+    public void updateCodegenPropertyEnum(CodegenProperty var) {
+        // make sure the inline enums have plain defaults (e.g. string, int, float)
+        String enumDefault = null;
+        if (var.isEnum && var.defaultValue != null) {
+            enumDefault = var.defaultValue;
+        }
+        super.updateCodegenPropertyEnum(var);
+        if (var.isEnum && enumDefault != null) {
+            var.defaultValue = enumDefault;
+        }
+    }
+
+    @Override
+    public String toDefaultValue(Schema p) {
+        p = ModelUtils.getReferencedSchema(this.openAPI, p);
+        if (ModelUtils.isStringSchema(p)) {
+            if (p.getDefault() != null) {
+                return "\"" + escapeText((String) p.getDefault()) + "\"";
+            }
+            return null;
+        }
+
+        return super.toDefaultValue(p);
+    }
+
+    @Override
+    public CodegenProperty fromProperty(String name, Schema p) {
+        CodegenProperty prop = super.fromProperty(name, p);
+        String cc = camelize(prop.name, true);
+        if (isReservedWord(cc)) {
+            cc = escapeReservedWord(cc);
+        }
+        prop.nameInCamelCase = cc;
+        return prop;
+    }
+
     @Override
     public Map<String, Object> postProcessModels(Map<String, Object> objs) {
 
diff --git a/modules/openapi-generator/src/main/resources/go-experimental/model.mustache b/modules/openapi-generator/src/main/resources/go-experimental/model.mustache
index bdb0cc433f2..d7737fc33fb 100644
--- a/modules/openapi-generator/src/main/resources/go-experimental/model.mustache
+++ b/modules/openapi-generator/src/main/resources/go-experimental/model.mustache
@@ -52,6 +52,44 @@ type {{classname}} struct {
 
 {{^isEnum}}
 {{^vendorExtensions.x-is-one-of-interface}}
+// New{{classname}} instantiates a new {{classname}} object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func New{{classname}}({{#vars}}{{#required}}{{nameInCamelCase}} {{dataType}}, {{/required}}{{/vars}}) *{{classname}} {
+    this := {{classname}}{}
+{{#vars}}
+{{#required}}
+    this.{{name}} = {{nameInCamelCase}}
+{{/required}}
+{{^required}}
+{{#defaultValue}}
+{{^isContainer}}
+    var {{nameInCamelCase}} {{{dataType}}} = {{#isNullable}}{{{dataType}}}{Value: {{/isNullable}}{{{.}}}{{#isNullable}} }{{/isNullable}}
+    this.{{name}} = {{^required}}&{{/required}}{{nameInCamelCase}}
+{{/isContainer}}
+{{/defaultValue}}
+{{/required}}
+{{/vars}}
+    return &this
+}
+
+// New{{classname}}WithDefaults instantiates a new {{classname}} object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func New{{classname}}WithDefaults() *{{classname}} {
+    this := {{classname}}{}
+{{#vars}}
+{{#defaultValue}}
+{{^isContainer}}
+    var {{nameInCamelCase}} {{{dataType}}} = {{#isNullable}}{{{dataType}}}{Value: {{/isNullable}}{{{.}}}{{#isNullable}} }{{/isNullable}}
+    this.{{name}} = {{^required}}&{{/required}}{{nameInCamelCase}}
+{{/isContainer}}
+{{/defaultValue}}
+{{/vars}}
+    return &this
+}
+
 {{#vars}}
 {{#required}}
 // Get{{name}} returns the {{name}} field value
diff --git a/modules/openapi-generator/src/main/resources/go-experimental/model_doc.mustache b/modules/openapi-generator/src/main/resources/go-experimental/model_doc.mustache
index 8b7683a8b26..d65510b0e74 100644
--- a/modules/openapi-generator/src/main/resources/go-experimental/model_doc.mustache
+++ b/modules/openapi-generator/src/main/resources/go-experimental/model_doc.mustache
@@ -16,6 +16,23 @@ Name | Type | Description | Notes
 ## Methods
 
 {{^vendorExtensions.x-is-one-of-interface}}
+### New{{classname}}
+
+`func New{{classname}}({{#vars}}{{#required}}{{nameInCamelCase}} {{dataType}}, {{/required}}{{/vars}}) *{{classname}}`
+
+New{{classname}} instantiates a new {{classname}} object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### New{{classname}}WithDefaults
+
+`func New{{classname}}WithDefaults() *{{classname}}`
+
+New{{classname}}WithDefaults instantiates a new {{classname}} object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 {{#vars}}
 ### Get{{name}}
 
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesAnyType.md b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesAnyType.md
index d6a64a17629..d8844341836 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesAnyType.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesAnyType.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewAdditionalPropertiesAnyType
+
+`func NewAdditionalPropertiesAnyType() *AdditionalPropertiesAnyType`
+
+NewAdditionalPropertiesAnyType instantiates a new AdditionalPropertiesAnyType object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewAdditionalPropertiesAnyTypeWithDefaults
+
+`func NewAdditionalPropertiesAnyTypeWithDefaults() *AdditionalPropertiesAnyType`
+
+NewAdditionalPropertiesAnyTypeWithDefaults instantiates a new AdditionalPropertiesAnyType object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *AdditionalPropertiesAnyType) GetName() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesArray.md b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesArray.md
index 8fa3956c6cb..abf35273f07 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesArray.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesArray.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewAdditionalPropertiesArray
+
+`func NewAdditionalPropertiesArray() *AdditionalPropertiesArray`
+
+NewAdditionalPropertiesArray instantiates a new AdditionalPropertiesArray object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewAdditionalPropertiesArrayWithDefaults
+
+`func NewAdditionalPropertiesArrayWithDefaults() *AdditionalPropertiesArray`
+
+NewAdditionalPropertiesArrayWithDefaults instantiates a new AdditionalPropertiesArray object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *AdditionalPropertiesArray) GetName() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesBoolean.md b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesBoolean.md
index dab05846a08..96c7719026b 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesBoolean.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesBoolean.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewAdditionalPropertiesBoolean
+
+`func NewAdditionalPropertiesBoolean() *AdditionalPropertiesBoolean`
+
+NewAdditionalPropertiesBoolean instantiates a new AdditionalPropertiesBoolean object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewAdditionalPropertiesBooleanWithDefaults
+
+`func NewAdditionalPropertiesBooleanWithDefaults() *AdditionalPropertiesBoolean`
+
+NewAdditionalPropertiesBooleanWithDefaults instantiates a new AdditionalPropertiesBoolean object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *AdditionalPropertiesBoolean) GetName() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesClass.md b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesClass.md
index 8b22e0ef339..e682a1bcff7 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesClass.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesClass.md
@@ -18,6 +18,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewAdditionalPropertiesClass
+
+`func NewAdditionalPropertiesClass() *AdditionalPropertiesClass`
+
+NewAdditionalPropertiesClass instantiates a new AdditionalPropertiesClass object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewAdditionalPropertiesClassWithDefaults
+
+`func NewAdditionalPropertiesClassWithDefaults() *AdditionalPropertiesClass`
+
+NewAdditionalPropertiesClassWithDefaults instantiates a new AdditionalPropertiesClass object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetMapString
 
 `func (o *AdditionalPropertiesClass) GetMapString() map[string]string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesInteger.md b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesInteger.md
index 9bed1f72584..8ce65eab96b 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesInteger.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesInteger.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewAdditionalPropertiesInteger
+
+`func NewAdditionalPropertiesInteger() *AdditionalPropertiesInteger`
+
+NewAdditionalPropertiesInteger instantiates a new AdditionalPropertiesInteger object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewAdditionalPropertiesIntegerWithDefaults
+
+`func NewAdditionalPropertiesIntegerWithDefaults() *AdditionalPropertiesInteger`
+
+NewAdditionalPropertiesIntegerWithDefaults instantiates a new AdditionalPropertiesInteger object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *AdditionalPropertiesInteger) GetName() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesNumber.md b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesNumber.md
index efc3cc156c1..18f9a942e99 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesNumber.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesNumber.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewAdditionalPropertiesNumber
+
+`func NewAdditionalPropertiesNumber() *AdditionalPropertiesNumber`
+
+NewAdditionalPropertiesNumber instantiates a new AdditionalPropertiesNumber object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewAdditionalPropertiesNumberWithDefaults
+
+`func NewAdditionalPropertiesNumberWithDefaults() *AdditionalPropertiesNumber`
+
+NewAdditionalPropertiesNumberWithDefaults instantiates a new AdditionalPropertiesNumber object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *AdditionalPropertiesNumber) GetName() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesObject.md b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesObject.md
index af396344684..0d511d3bf0e 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesObject.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesObject.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewAdditionalPropertiesObject
+
+`func NewAdditionalPropertiesObject() *AdditionalPropertiesObject`
+
+NewAdditionalPropertiesObject instantiates a new AdditionalPropertiesObject object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewAdditionalPropertiesObjectWithDefaults
+
+`func NewAdditionalPropertiesObjectWithDefaults() *AdditionalPropertiesObject`
+
+NewAdditionalPropertiesObjectWithDefaults instantiates a new AdditionalPropertiesObject object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *AdditionalPropertiesObject) GetName() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesString.md b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesString.md
index 0934f9bf504..6533cd5f734 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesString.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesString.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewAdditionalPropertiesString
+
+`func NewAdditionalPropertiesString() *AdditionalPropertiesString`
+
+NewAdditionalPropertiesString instantiates a new AdditionalPropertiesString object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewAdditionalPropertiesStringWithDefaults
+
+`func NewAdditionalPropertiesStringWithDefaults() *AdditionalPropertiesString`
+
+NewAdditionalPropertiesStringWithDefaults instantiates a new AdditionalPropertiesString object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *AdditionalPropertiesString) GetName() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Animal.md b/samples/client/petstore/go-experimental/go-petstore/docs/Animal.md
index 55133b29745..8bccff5eb4d 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Animal.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Animal.md
@@ -5,10 +5,27 @@
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **ClassName** | Pointer to **string** |  | 
-**Color** | Pointer to **string** |  | [optional] [default to red]
+**Color** | Pointer to **string** |  | [optional] [default to "red"]
 
 ## Methods
 
+### NewAnimal
+
+`func NewAnimal(className string, ) *Animal`
+
+NewAnimal instantiates a new Animal object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewAnimalWithDefaults
+
+`func NewAnimalWithDefaults() *Animal`
+
+NewAnimalWithDefaults instantiates a new Animal object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetClassName
 
 `func (o *Animal) GetClassName() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/ApiResponse.md b/samples/client/petstore/go-experimental/go-petstore/docs/ApiResponse.md
index b0c891bbc96..aeb34407fa4 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/ApiResponse.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/ApiResponse.md
@@ -10,6 +10,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewApiResponse
+
+`func NewApiResponse() *ApiResponse`
+
+NewApiResponse instantiates a new ApiResponse object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewApiResponseWithDefaults
+
+`func NewApiResponseWithDefaults() *ApiResponse`
+
+NewApiResponseWithDefaults instantiates a new ApiResponse object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetCode
 
 `func (o *ApiResponse) GetCode() int32`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/ArrayOfArrayOfNumberOnly.md b/samples/client/petstore/go-experimental/go-petstore/docs/ArrayOfArrayOfNumberOnly.md
index 64ad908ea3b..882bdf15eab 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/ArrayOfArrayOfNumberOnly.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/ArrayOfArrayOfNumberOnly.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewArrayOfArrayOfNumberOnly
+
+`func NewArrayOfArrayOfNumberOnly() *ArrayOfArrayOfNumberOnly`
+
+NewArrayOfArrayOfNumberOnly instantiates a new ArrayOfArrayOfNumberOnly object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewArrayOfArrayOfNumberOnlyWithDefaults
+
+`func NewArrayOfArrayOfNumberOnlyWithDefaults() *ArrayOfArrayOfNumberOnly`
+
+NewArrayOfArrayOfNumberOnlyWithDefaults instantiates a new ArrayOfArrayOfNumberOnly object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetArrayArrayNumber
 
 `func (o *ArrayOfArrayOfNumberOnly) GetArrayArrayNumber() [][]float32`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/ArrayOfNumberOnly.md b/samples/client/petstore/go-experimental/go-petstore/docs/ArrayOfNumberOnly.md
index 0ce95922a5e..7355a0ce13e 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/ArrayOfNumberOnly.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/ArrayOfNumberOnly.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewArrayOfNumberOnly
+
+`func NewArrayOfNumberOnly() *ArrayOfNumberOnly`
+
+NewArrayOfNumberOnly instantiates a new ArrayOfNumberOnly object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewArrayOfNumberOnlyWithDefaults
+
+`func NewArrayOfNumberOnlyWithDefaults() *ArrayOfNumberOnly`
+
+NewArrayOfNumberOnlyWithDefaults instantiates a new ArrayOfNumberOnly object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetArrayNumber
 
 `func (o *ArrayOfNumberOnly) GetArrayNumber() []float32`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/ArrayTest.md b/samples/client/petstore/go-experimental/go-petstore/docs/ArrayTest.md
index f7020fadea3..e2b623a2412 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/ArrayTest.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/ArrayTest.md
@@ -10,6 +10,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewArrayTest
+
+`func NewArrayTest() *ArrayTest`
+
+NewArrayTest instantiates a new ArrayTest object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewArrayTestWithDefaults
+
+`func NewArrayTestWithDefaults() *ArrayTest`
+
+NewArrayTestWithDefaults instantiates a new ArrayTest object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetArrayOfString
 
 `func (o *ArrayTest) GetArrayOfString() []string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/BigCat.md b/samples/client/petstore/go-experimental/go-petstore/docs/BigCat.md
index 1f1f446d027..86ca5fd22b6 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/BigCat.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/BigCat.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewBigCat
+
+`func NewBigCat() *BigCat`
+
+NewBigCat instantiates a new BigCat object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewBigCatWithDefaults
+
+`func NewBigCatWithDefaults() *BigCat`
+
+NewBigCatWithDefaults instantiates a new BigCat object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetKind
 
 `func (o *BigCat) GetKind() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/BigCatAllOf.md b/samples/client/petstore/go-experimental/go-petstore/docs/BigCatAllOf.md
index c886448d38d..bc15e3fc18f 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/BigCatAllOf.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/BigCatAllOf.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewBigCatAllOf
+
+`func NewBigCatAllOf() *BigCatAllOf`
+
+NewBigCatAllOf instantiates a new BigCatAllOf object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewBigCatAllOfWithDefaults
+
+`func NewBigCatAllOfWithDefaults() *BigCatAllOf`
+
+NewBigCatAllOfWithDefaults instantiates a new BigCatAllOf object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetKind
 
 `func (o *BigCatAllOf) GetKind() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Capitalization.md b/samples/client/petstore/go-experimental/go-petstore/docs/Capitalization.md
index a4772d74006..45c74e97903 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Capitalization.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Capitalization.md
@@ -13,6 +13,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewCapitalization
+
+`func NewCapitalization() *Capitalization`
+
+NewCapitalization instantiates a new Capitalization object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewCapitalizationWithDefaults
+
+`func NewCapitalizationWithDefaults() *Capitalization`
+
+NewCapitalizationWithDefaults instantiates a new Capitalization object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetSmallCamel
 
 `func (o *Capitalization) GetSmallCamel() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Cat.md b/samples/client/petstore/go-experimental/go-petstore/docs/Cat.md
index c7ea3b3adfb..415cabfdce7 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Cat.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Cat.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewCat
+
+`func NewCat() *Cat`
+
+NewCat instantiates a new Cat object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewCatWithDefaults
+
+`func NewCatWithDefaults() *Cat`
+
+NewCatWithDefaults instantiates a new Cat object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetDeclawed
 
 `func (o *Cat) GetDeclawed() bool`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/CatAllOf.md b/samples/client/petstore/go-experimental/go-petstore/docs/CatAllOf.md
index 85f40d251d9..62d0919f473 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/CatAllOf.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/CatAllOf.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewCatAllOf
+
+`func NewCatAllOf() *CatAllOf`
+
+NewCatAllOf instantiates a new CatAllOf object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewCatAllOfWithDefaults
+
+`func NewCatAllOfWithDefaults() *CatAllOf`
+
+NewCatAllOfWithDefaults instantiates a new CatAllOf object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetDeclawed
 
 `func (o *CatAllOf) GetDeclawed() bool`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Category.md b/samples/client/petstore/go-experimental/go-petstore/docs/Category.md
index 88b525bade1..7f77b6cc7a2 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Category.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Category.md
@@ -5,10 +5,27 @@
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **Id** | Pointer to **int64** |  | [optional] 
-**Name** | Pointer to **string** |  | [default to default-name]
+**Name** | Pointer to **string** |  | [default to "default-name"]
 
 ## Methods
 
+### NewCategory
+
+`func NewCategory(name string, ) *Category`
+
+NewCategory instantiates a new Category object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewCategoryWithDefaults
+
+`func NewCategoryWithDefaults() *Category`
+
+NewCategoryWithDefaults instantiates a new Category object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetId
 
 `func (o *Category) GetId() int64`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/ClassModel.md b/samples/client/petstore/go-experimental/go-petstore/docs/ClassModel.md
index d9c4f41e98b..11a115ee706 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/ClassModel.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/ClassModel.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewClassModel
+
+`func NewClassModel() *ClassModel`
+
+NewClassModel instantiates a new ClassModel object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewClassModelWithDefaults
+
+`func NewClassModelWithDefaults() *ClassModel`
+
+NewClassModelWithDefaults instantiates a new ClassModel object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetClass
 
 `func (o *ClassModel) GetClass() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Client.md b/samples/client/petstore/go-experimental/go-petstore/docs/Client.md
index 5ed3098fd49..187225fe5ad 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Client.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Client.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewClient
+
+`func NewClient() *Client`
+
+NewClient instantiates a new Client object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewClientWithDefaults
+
+`func NewClientWithDefaults() *Client`
+
+NewClientWithDefaults instantiates a new Client object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetClient
 
 `func (o *Client) GetClient() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Dog.md b/samples/client/petstore/go-experimental/go-petstore/docs/Dog.md
index ddc5be776dc..1251c1b134f 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Dog.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Dog.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewDog
+
+`func NewDog() *Dog`
+
+NewDog instantiates a new Dog object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewDogWithDefaults
+
+`func NewDogWithDefaults() *Dog`
+
+NewDogWithDefaults instantiates a new Dog object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetBreed
 
 `func (o *Dog) GetBreed() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/DogAllOf.md b/samples/client/petstore/go-experimental/go-petstore/docs/DogAllOf.md
index a3169521cec..177637eeaa8 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/DogAllOf.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/DogAllOf.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewDogAllOf
+
+`func NewDogAllOf() *DogAllOf`
+
+NewDogAllOf instantiates a new DogAllOf object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewDogAllOfWithDefaults
+
+`func NewDogAllOfWithDefaults() *DogAllOf`
+
+NewDogAllOfWithDefaults instantiates a new DogAllOf object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetBreed
 
 `func (o *DogAllOf) GetBreed() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/EnumArrays.md b/samples/client/petstore/go-experimental/go-petstore/docs/EnumArrays.md
index 31d7b2b9faa..684a0f982b5 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/EnumArrays.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/EnumArrays.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewEnumArrays
+
+`func NewEnumArrays() *EnumArrays`
+
+NewEnumArrays instantiates a new EnumArrays object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewEnumArraysWithDefaults
+
+`func NewEnumArraysWithDefaults() *EnumArrays`
+
+NewEnumArraysWithDefaults instantiates a new EnumArrays object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetJustSymbol
 
 `func (o *EnumArrays) GetJustSymbol() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/EnumTest.md b/samples/client/petstore/go-experimental/go-petstore/docs/EnumTest.md
index d0e7aebc42d..8eabc13126c 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/EnumTest.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/EnumTest.md
@@ -12,6 +12,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewEnumTest
+
+`func NewEnumTest(enumStringRequired string, ) *EnumTest`
+
+NewEnumTest instantiates a new EnumTest object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewEnumTestWithDefaults
+
+`func NewEnumTestWithDefaults() *EnumTest`
+
+NewEnumTestWithDefaults instantiates a new EnumTest object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetEnumString
 
 `func (o *EnumTest) GetEnumString() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/FakeApi.md b/samples/client/petstore/go-experimental/go-petstore/docs/FakeApi.md
index c81d4523824..c9d3b6cd625 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/FakeApi.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/FakeApi.md
@@ -404,13 +404,13 @@ Other parameters are passed through a pointer to a apiTestEnumParametersRequest
 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **enumHeaderStringArray** | [**[]string**](string.md) | Header parameter enum test (string array) | 
- **enumHeaderString** | **string** | Header parameter enum test (string) | [default to -efg]
+ **enumHeaderString** | **string** | Header parameter enum test (string) | [default to &quot;-efg&quot;]
  **enumQueryStringArray** | [**[]string**](string.md) | Query parameter enum test (string array) | 
- **enumQueryString** | **string** | Query parameter enum test (string) | [default to -efg]
+ **enumQueryString** | **string** | Query parameter enum test (string) | [default to &quot;-efg&quot;]
  **enumQueryInteger** | **int32** | Query parameter enum test (double) | 
  **enumQueryDouble** | **float64** | Query parameter enum test (double) | 
- **enumFormStringArray** | [**[]string**](string.md) | Form parameter enum test (string array) | [default to $]
- **enumFormString** | **string** | Form parameter enum test (string) | [default to -efg]
+ **enumFormStringArray** | [**[]string**](string.md) | Form parameter enum test (string array) | [default to &quot;$&quot;]
+ **enumFormString** | **string** | Form parameter enum test (string) | [default to &quot;-efg&quot;]
 
 ### Return type
 
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/File.md b/samples/client/petstore/go-experimental/go-petstore/docs/File.md
index 454b159609c..507191f19b6 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/File.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/File.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewFile
+
+`func NewFile() *File`
+
+NewFile instantiates a new File object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewFileWithDefaults
+
+`func NewFileWithDefaults() *File`
+
+NewFileWithDefaults instantiates a new File object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetSourceURI
 
 `func (o *File) GetSourceURI() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/FileSchemaTestClass.md b/samples/client/petstore/go-experimental/go-petstore/docs/FileSchemaTestClass.md
index d4a4da7206c..37f671ef8f8 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/FileSchemaTestClass.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/FileSchemaTestClass.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewFileSchemaTestClass
+
+`func NewFileSchemaTestClass() *FileSchemaTestClass`
+
+NewFileSchemaTestClass instantiates a new FileSchemaTestClass object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewFileSchemaTestClassWithDefaults
+
+`func NewFileSchemaTestClassWithDefaults() *FileSchemaTestClass`
+
+NewFileSchemaTestClassWithDefaults instantiates a new FileSchemaTestClass object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetFile
 
 `func (o *FileSchemaTestClass) GetFile() File`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/FormatTest.md b/samples/client/petstore/go-experimental/go-petstore/docs/FormatTest.md
index c1633f9cae2..f7226cc51eb 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/FormatTest.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/FormatTest.md
@@ -21,6 +21,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewFormatTest
+
+`func NewFormatTest(number float32, byte_ string, date string, password string, ) *FormatTest`
+
+NewFormatTest instantiates a new FormatTest object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewFormatTestWithDefaults
+
+`func NewFormatTestWithDefaults() *FormatTest`
+
+NewFormatTestWithDefaults instantiates a new FormatTest object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetInteger
 
 `func (o *FormatTest) GetInteger() int32`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/HasOnlyReadOnly.md b/samples/client/petstore/go-experimental/go-petstore/docs/HasOnlyReadOnly.md
index b5502272ce3..84d8266d59f 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/HasOnlyReadOnly.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/HasOnlyReadOnly.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewHasOnlyReadOnly
+
+`func NewHasOnlyReadOnly() *HasOnlyReadOnly`
+
+NewHasOnlyReadOnly instantiates a new HasOnlyReadOnly object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewHasOnlyReadOnlyWithDefaults
+
+`func NewHasOnlyReadOnlyWithDefaults() *HasOnlyReadOnly`
+
+NewHasOnlyReadOnlyWithDefaults instantiates a new HasOnlyReadOnly object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetBar
 
 `func (o *HasOnlyReadOnly) GetBar() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/List.md b/samples/client/petstore/go-experimental/go-petstore/docs/List.md
index ca8849936e7..4d914555e33 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/List.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/List.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewList
+
+`func NewList() *List`
+
+NewList instantiates a new List object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewListWithDefaults
+
+`func NewListWithDefaults() *List`
+
+NewListWithDefaults instantiates a new List object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetVar123List
 
 `func (o *List) GetVar123List() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/MapTest.md b/samples/client/petstore/go-experimental/go-petstore/docs/MapTest.md
index 6c84c2e89c2..c752f6e86b5 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/MapTest.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/MapTest.md
@@ -11,6 +11,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewMapTest
+
+`func NewMapTest() *MapTest`
+
+NewMapTest instantiates a new MapTest object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewMapTestWithDefaults
+
+`func NewMapTestWithDefaults() *MapTest`
+
+NewMapTestWithDefaults instantiates a new MapTest object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetMapMapOfString
 
 `func (o *MapTest) GetMapMapOfString() map[string]map[string]string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/MixedPropertiesAndAdditionalPropertiesClass.md b/samples/client/petstore/go-experimental/go-petstore/docs/MixedPropertiesAndAdditionalPropertiesClass.md
index 49f7c8eb768..2a1eb5eaba3 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/MixedPropertiesAndAdditionalPropertiesClass.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/MixedPropertiesAndAdditionalPropertiesClass.md
@@ -10,6 +10,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewMixedPropertiesAndAdditionalPropertiesClass
+
+`func NewMixedPropertiesAndAdditionalPropertiesClass() *MixedPropertiesAndAdditionalPropertiesClass`
+
+NewMixedPropertiesAndAdditionalPropertiesClass instantiates a new MixedPropertiesAndAdditionalPropertiesClass object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewMixedPropertiesAndAdditionalPropertiesClassWithDefaults
+
+`func NewMixedPropertiesAndAdditionalPropertiesClassWithDefaults() *MixedPropertiesAndAdditionalPropertiesClass`
+
+NewMixedPropertiesAndAdditionalPropertiesClassWithDefaults instantiates a new MixedPropertiesAndAdditionalPropertiesClass object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetUuid
 
 `func (o *MixedPropertiesAndAdditionalPropertiesClass) GetUuid() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Model200Response.md b/samples/client/petstore/go-experimental/go-petstore/docs/Model200Response.md
index d0bde7b7f7b..00bce3a9909 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Model200Response.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Model200Response.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewModel200Response
+
+`func NewModel200Response() *Model200Response`
+
+NewModel200Response instantiates a new Model200Response object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewModel200ResponseWithDefaults
+
+`func NewModel200ResponseWithDefaults() *Model200Response`
+
+NewModel200ResponseWithDefaults instantiates a new Model200Response object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *Model200Response) GetName() int32`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Name.md b/samples/client/petstore/go-experimental/go-petstore/docs/Name.md
index 6104c42bebd..cbcab366761 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Name.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Name.md
@@ -11,6 +11,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewName
+
+`func NewName(name int32, ) *Name`
+
+NewName instantiates a new Name object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewNameWithDefaults
+
+`func NewNameWithDefaults() *Name`
+
+NewNameWithDefaults instantiates a new Name object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *Name) GetName() int32`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/NumberOnly.md b/samples/client/petstore/go-experimental/go-petstore/docs/NumberOnly.md
index c8dcac264c2..2a30b0b1283 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/NumberOnly.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/NumberOnly.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewNumberOnly
+
+`func NewNumberOnly() *NumberOnly`
+
+NewNumberOnly instantiates a new NumberOnly object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewNumberOnlyWithDefaults
+
+`func NewNumberOnlyWithDefaults() *NumberOnly`
+
+NewNumberOnlyWithDefaults instantiates a new NumberOnly object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetJustNumber
 
 `func (o *NumberOnly) GetJustNumber() float32`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Order.md b/samples/client/petstore/go-experimental/go-petstore/docs/Order.md
index 8aa8bbd1ee5..71bb824a6ca 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Order.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Order.md
@@ -13,6 +13,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewOrder
+
+`func NewOrder() *Order`
+
+NewOrder instantiates a new Order object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewOrderWithDefaults
+
+`func NewOrderWithDefaults() *Order`
+
+NewOrderWithDefaults instantiates a new Order object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetId
 
 `func (o *Order) GetId() int64`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/OuterComposite.md b/samples/client/petstore/go-experimental/go-petstore/docs/OuterComposite.md
index f8908022282..e91d7b978ae 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/OuterComposite.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/OuterComposite.md
@@ -10,6 +10,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewOuterComposite
+
+`func NewOuterComposite() *OuterComposite`
+
+NewOuterComposite instantiates a new OuterComposite object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewOuterCompositeWithDefaults
+
+`func NewOuterCompositeWithDefaults() *OuterComposite`
+
+NewOuterCompositeWithDefaults instantiates a new OuterComposite object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetMyNumber
 
 `func (o *OuterComposite) GetMyNumber() float32`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Pet.md b/samples/client/petstore/go-experimental/go-petstore/docs/Pet.md
index dba9589f9d7..faa1e31e870 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Pet.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Pet.md
@@ -13,6 +13,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewPet
+
+`func NewPet(name string, photoUrls []string, ) *Pet`
+
+NewPet instantiates a new Pet object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewPetWithDefaults
+
+`func NewPetWithDefaults() *Pet`
+
+NewPetWithDefaults instantiates a new Pet object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetId
 
 `func (o *Pet) GetId() int64`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/ReadOnlyFirst.md b/samples/client/petstore/go-experimental/go-petstore/docs/ReadOnlyFirst.md
index ce2ff23bc61..c0ee88a7036 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/ReadOnlyFirst.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/ReadOnlyFirst.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewReadOnlyFirst
+
+`func NewReadOnlyFirst() *ReadOnlyFirst`
+
+NewReadOnlyFirst instantiates a new ReadOnlyFirst object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewReadOnlyFirstWithDefaults
+
+`func NewReadOnlyFirstWithDefaults() *ReadOnlyFirst`
+
+NewReadOnlyFirstWithDefaults instantiates a new ReadOnlyFirst object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetBar
 
 `func (o *ReadOnlyFirst) GetBar() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Return.md b/samples/client/petstore/go-experimental/go-petstore/docs/Return.md
index 1facabb6bbf..1437ef84e52 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Return.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Return.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewReturn
+
+`func NewReturn() *Return`
+
+NewReturn instantiates a new Return object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewReturnWithDefaults
+
+`func NewReturnWithDefaults() *Return`
+
+NewReturnWithDefaults instantiates a new Return object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetReturn
 
 `func (o *Return) GetReturn() int32`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/SpecialModelName.md b/samples/client/petstore/go-experimental/go-petstore/docs/SpecialModelName.md
index 34d8d8d89c7..c273842c32b 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/SpecialModelName.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/SpecialModelName.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewSpecialModelName
+
+`func NewSpecialModelName() *SpecialModelName`
+
+NewSpecialModelName instantiates a new SpecialModelName object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewSpecialModelNameWithDefaults
+
+`func NewSpecialModelNameWithDefaults() *SpecialModelName`
+
+NewSpecialModelNameWithDefaults instantiates a new SpecialModelName object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetSpecialPropertyName
 
 `func (o *SpecialModelName) GetSpecialPropertyName() int64`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/Tag.md b/samples/client/petstore/go-experimental/go-petstore/docs/Tag.md
index bf868298a5e..84b8770dac0 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/Tag.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/Tag.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewTag
+
+`func NewTag() *Tag`
+
+NewTag instantiates a new Tag object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewTagWithDefaults
+
+`func NewTagWithDefaults() *Tag`
+
+NewTagWithDefaults instantiates a new Tag object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetId
 
 `func (o *Tag) GetId() int64`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/TypeHolderDefault.md b/samples/client/petstore/go-experimental/go-petstore/docs/TypeHolderDefault.md
index 85097ef9fbe..e75e6b96ae6 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/TypeHolderDefault.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/TypeHolderDefault.md
@@ -4,7 +4,7 @@
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**StringItem** | Pointer to **string** |  | [default to what]
+**StringItem** | Pointer to **string** |  | [default to "what"]
 **NumberItem** | Pointer to **float32** |  | 
 **IntegerItem** | Pointer to **int32** |  | 
 **BoolItem** | Pointer to **bool** |  | [default to true]
@@ -12,6 +12,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewTypeHolderDefault
+
+`func NewTypeHolderDefault(stringItem string, numberItem float32, integerItem int32, boolItem bool, arrayItem []int32, ) *TypeHolderDefault`
+
+NewTypeHolderDefault instantiates a new TypeHolderDefault object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewTypeHolderDefaultWithDefaults
+
+`func NewTypeHolderDefaultWithDefaults() *TypeHolderDefault`
+
+NewTypeHolderDefaultWithDefaults instantiates a new TypeHolderDefault object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetStringItem
 
 `func (o *TypeHolderDefault) GetStringItem() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/TypeHolderExample.md b/samples/client/petstore/go-experimental/go-petstore/docs/TypeHolderExample.md
index 3f9349a9b9a..1c19f186fc7 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/TypeHolderExample.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/TypeHolderExample.md
@@ -13,6 +13,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewTypeHolderExample
+
+`func NewTypeHolderExample(stringItem string, numberItem float32, floatItem float32, integerItem int32, boolItem bool, arrayItem []int32, ) *TypeHolderExample`
+
+NewTypeHolderExample instantiates a new TypeHolderExample object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewTypeHolderExampleWithDefaults
+
+`func NewTypeHolderExampleWithDefaults() *TypeHolderExample`
+
+NewTypeHolderExampleWithDefaults instantiates a new TypeHolderExample object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetStringItem
 
 `func (o *TypeHolderExample) GetStringItem() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/User.md b/samples/client/petstore/go-experimental/go-petstore/docs/User.md
index 8b93a65d8ab..e9720af9fb7 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/User.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/User.md
@@ -15,6 +15,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewUser
+
+`func NewUser() *User`
+
+NewUser instantiates a new User object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewUserWithDefaults
+
+`func NewUserWithDefaults() *User`
+
+NewUserWithDefaults instantiates a new User object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetId
 
 `func (o *User) GetId() int64`
diff --git a/samples/client/petstore/go-experimental/go-petstore/docs/XmlItem.md b/samples/client/petstore/go-experimental/go-petstore/docs/XmlItem.md
index 99c95015d5f..6798de558fb 100644
--- a/samples/client/petstore/go-experimental/go-petstore/docs/XmlItem.md
+++ b/samples/client/petstore/go-experimental/go-petstore/docs/XmlItem.md
@@ -36,6 +36,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewXmlItem
+
+`func NewXmlItem() *XmlItem`
+
+NewXmlItem instantiates a new XmlItem object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewXmlItemWithDefaults
+
+`func NewXmlItemWithDefaults() *XmlItem`
+
+NewXmlItemWithDefaults instantiates a new XmlItem object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetAttributeString
 
 `func (o *XmlItem) GetAttributeString() string`
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_200_response.go b/samples/client/petstore/go-experimental/go-petstore/model_200_response.go
index b4e9becc59c..8c2c0f493c0 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_200_response.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_200_response.go
@@ -20,6 +20,23 @@ type Model200Response struct {
 	Class *string `json:"class,omitempty"`
 }
 
+// NewModel200Response instantiates a new Model200Response object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewModel200Response() *Model200Response {
+    this := Model200Response{}
+    return &this
+}
+
+// NewModel200ResponseWithDefaults instantiates a new Model200Response object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewModel200ResponseWithDefaults() *Model200Response {
+    this := Model200Response{}
+    return &this
+}
+
 // GetName returns the Name field value if set, zero value otherwise.
 func (o *Model200Response) GetName() int32 {
 	if o == nil || o.Name == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_any_type.go b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_any_type.go
index 72a28831595..6c3d6a60e3b 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_any_type.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_any_type.go
@@ -19,6 +19,23 @@ type AdditionalPropertiesAnyType struct {
 	Name *string `json:"name,omitempty"`
 }
 
+// NewAdditionalPropertiesAnyType instantiates a new AdditionalPropertiesAnyType object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewAdditionalPropertiesAnyType() *AdditionalPropertiesAnyType {
+    this := AdditionalPropertiesAnyType{}
+    return &this
+}
+
+// NewAdditionalPropertiesAnyTypeWithDefaults instantiates a new AdditionalPropertiesAnyType object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewAdditionalPropertiesAnyTypeWithDefaults() *AdditionalPropertiesAnyType {
+    this := AdditionalPropertiesAnyType{}
+    return &this
+}
+
 // GetName returns the Name field value if set, zero value otherwise.
 func (o *AdditionalPropertiesAnyType) GetName() string {
 	if o == nil || o.Name == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_array.go b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_array.go
index 1a20f680cb9..c6e4f9716c5 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_array.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_array.go
@@ -19,6 +19,23 @@ type AdditionalPropertiesArray struct {
 	Name *string `json:"name,omitempty"`
 }
 
+// NewAdditionalPropertiesArray instantiates a new AdditionalPropertiesArray object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewAdditionalPropertiesArray() *AdditionalPropertiesArray {
+    this := AdditionalPropertiesArray{}
+    return &this
+}
+
+// NewAdditionalPropertiesArrayWithDefaults instantiates a new AdditionalPropertiesArray object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewAdditionalPropertiesArrayWithDefaults() *AdditionalPropertiesArray {
+    this := AdditionalPropertiesArray{}
+    return &this
+}
+
 // GetName returns the Name field value if set, zero value otherwise.
 func (o *AdditionalPropertiesArray) GetName() string {
 	if o == nil || o.Name == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_boolean.go b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_boolean.go
index 218547d406c..7115a99e8f6 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_boolean.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_boolean.go
@@ -19,6 +19,23 @@ type AdditionalPropertiesBoolean struct {
 	Name *string `json:"name,omitempty"`
 }
 
+// NewAdditionalPropertiesBoolean instantiates a new AdditionalPropertiesBoolean object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewAdditionalPropertiesBoolean() *AdditionalPropertiesBoolean {
+    this := AdditionalPropertiesBoolean{}
+    return &this
+}
+
+// NewAdditionalPropertiesBooleanWithDefaults instantiates a new AdditionalPropertiesBoolean object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewAdditionalPropertiesBooleanWithDefaults() *AdditionalPropertiesBoolean {
+    this := AdditionalPropertiesBoolean{}
+    return &this
+}
+
 // GetName returns the Name field value if set, zero value otherwise.
 func (o *AdditionalPropertiesBoolean) GetName() string {
 	if o == nil || o.Name == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_class.go b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_class.go
index 1a9c27fbd66..21a01f1b92f 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_class.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_class.go
@@ -29,6 +29,23 @@ type AdditionalPropertiesClass struct {
 	Anytype3 *map[string]interface{} `json:"anytype_3,omitempty"`
 }
 
+// NewAdditionalPropertiesClass instantiates a new AdditionalPropertiesClass object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewAdditionalPropertiesClass() *AdditionalPropertiesClass {
+    this := AdditionalPropertiesClass{}
+    return &this
+}
+
+// NewAdditionalPropertiesClassWithDefaults instantiates a new AdditionalPropertiesClass object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewAdditionalPropertiesClassWithDefaults() *AdditionalPropertiesClass {
+    this := AdditionalPropertiesClass{}
+    return &this
+}
+
 // GetMapString returns the MapString field value if set, zero value otherwise.
 func (o *AdditionalPropertiesClass) GetMapString() map[string]string {
 	if o == nil || o.MapString == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_integer.go b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_integer.go
index 40e13711d00..26323e4ff51 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_integer.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_integer.go
@@ -19,6 +19,23 @@ type AdditionalPropertiesInteger struct {
 	Name *string `json:"name,omitempty"`
 }
 
+// NewAdditionalPropertiesInteger instantiates a new AdditionalPropertiesInteger object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewAdditionalPropertiesInteger() *AdditionalPropertiesInteger {
+    this := AdditionalPropertiesInteger{}
+    return &this
+}
+
+// NewAdditionalPropertiesIntegerWithDefaults instantiates a new AdditionalPropertiesInteger object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewAdditionalPropertiesIntegerWithDefaults() *AdditionalPropertiesInteger {
+    this := AdditionalPropertiesInteger{}
+    return &this
+}
+
 // GetName returns the Name field value if set, zero value otherwise.
 func (o *AdditionalPropertiesInteger) GetName() string {
 	if o == nil || o.Name == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_number.go b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_number.go
index 36cd75cd687..3e25a072407 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_number.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_number.go
@@ -19,6 +19,23 @@ type AdditionalPropertiesNumber struct {
 	Name *string `json:"name,omitempty"`
 }
 
+// NewAdditionalPropertiesNumber instantiates a new AdditionalPropertiesNumber object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewAdditionalPropertiesNumber() *AdditionalPropertiesNumber {
+    this := AdditionalPropertiesNumber{}
+    return &this
+}
+
+// NewAdditionalPropertiesNumberWithDefaults instantiates a new AdditionalPropertiesNumber object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewAdditionalPropertiesNumberWithDefaults() *AdditionalPropertiesNumber {
+    this := AdditionalPropertiesNumber{}
+    return &this
+}
+
 // GetName returns the Name field value if set, zero value otherwise.
 func (o *AdditionalPropertiesNumber) GetName() string {
 	if o == nil || o.Name == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_object.go b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_object.go
index 3b284106f61..3b460ec5f3b 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_object.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_object.go
@@ -19,6 +19,23 @@ type AdditionalPropertiesObject struct {
 	Name *string `json:"name,omitempty"`
 }
 
+// NewAdditionalPropertiesObject instantiates a new AdditionalPropertiesObject object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewAdditionalPropertiesObject() *AdditionalPropertiesObject {
+    this := AdditionalPropertiesObject{}
+    return &this
+}
+
+// NewAdditionalPropertiesObjectWithDefaults instantiates a new AdditionalPropertiesObject object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewAdditionalPropertiesObjectWithDefaults() *AdditionalPropertiesObject {
+    this := AdditionalPropertiesObject{}
+    return &this
+}
+
 // GetName returns the Name field value if set, zero value otherwise.
 func (o *AdditionalPropertiesObject) GetName() string {
 	if o == nil || o.Name == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_string.go b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_string.go
index c0e754757bd..5165cb2e1b3 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_string.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_additional_properties_string.go
@@ -19,6 +19,23 @@ type AdditionalPropertiesString struct {
 	Name *string `json:"name,omitempty"`
 }
 
+// NewAdditionalPropertiesString instantiates a new AdditionalPropertiesString object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewAdditionalPropertiesString() *AdditionalPropertiesString {
+    this := AdditionalPropertiesString{}
+    return &this
+}
+
+// NewAdditionalPropertiesStringWithDefaults instantiates a new AdditionalPropertiesString object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewAdditionalPropertiesStringWithDefaults() *AdditionalPropertiesString {
+    this := AdditionalPropertiesString{}
+    return &this
+}
+
 // GetName returns the Name field value if set, zero value otherwise.
 func (o *AdditionalPropertiesString) GetName() string {
 	if o == nil || o.Name == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_animal.go b/samples/client/petstore/go-experimental/go-petstore/model_animal.go
index b54f59dbe61..47a4ba3a23a 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_animal.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_animal.go
@@ -20,6 +20,28 @@ type Animal struct {
 	Color *string `json:"color,omitempty"`
 }
 
+// NewAnimal instantiates a new Animal object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewAnimal(className string, ) *Animal {
+    this := Animal{}
+    this.ClassName = className
+    var color string = "red"
+    this.Color = &color
+    return &this
+}
+
+// NewAnimalWithDefaults instantiates a new Animal object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewAnimalWithDefaults() *Animal {
+    this := Animal{}
+    var color string = "red"
+    this.Color = &color
+    return &this
+}
+
 // GetClassName returns the ClassName field value
 func (o *Animal) GetClassName() string {
 	if o == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_api_response.go b/samples/client/petstore/go-experimental/go-petstore/model_api_response.go
index 0b9eab9f759..f150cfafa43 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_api_response.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_api_response.go
@@ -21,6 +21,23 @@ type ApiResponse struct {
 	Message *string `json:"message,omitempty"`
 }
 
+// NewApiResponse instantiates a new ApiResponse object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewApiResponse() *ApiResponse {
+    this := ApiResponse{}
+    return &this
+}
+
+// NewApiResponseWithDefaults instantiates a new ApiResponse object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewApiResponseWithDefaults() *ApiResponse {
+    this := ApiResponse{}
+    return &this
+}
+
 // GetCode returns the Code field value if set, zero value otherwise.
 func (o *ApiResponse) GetCode() int32 {
 	if o == nil || o.Code == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_array_of_array_of_number_only.go b/samples/client/petstore/go-experimental/go-petstore/model_array_of_array_of_number_only.go
index f2dbbb1f21e..cc9815c9873 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_array_of_array_of_number_only.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_array_of_array_of_number_only.go
@@ -19,6 +19,23 @@ type ArrayOfArrayOfNumberOnly struct {
 	ArrayArrayNumber *[][]float32 `json:"ArrayArrayNumber,omitempty"`
 }
 
+// NewArrayOfArrayOfNumberOnly instantiates a new ArrayOfArrayOfNumberOnly object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewArrayOfArrayOfNumberOnly() *ArrayOfArrayOfNumberOnly {
+    this := ArrayOfArrayOfNumberOnly{}
+    return &this
+}
+
+// NewArrayOfArrayOfNumberOnlyWithDefaults instantiates a new ArrayOfArrayOfNumberOnly object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewArrayOfArrayOfNumberOnlyWithDefaults() *ArrayOfArrayOfNumberOnly {
+    this := ArrayOfArrayOfNumberOnly{}
+    return &this
+}
+
 // GetArrayArrayNumber returns the ArrayArrayNumber field value if set, zero value otherwise.
 func (o *ArrayOfArrayOfNumberOnly) GetArrayArrayNumber() [][]float32 {
 	if o == nil || o.ArrayArrayNumber == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_array_of_number_only.go b/samples/client/petstore/go-experimental/go-petstore/model_array_of_number_only.go
index 9268a2ae608..49c1292100d 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_array_of_number_only.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_array_of_number_only.go
@@ -19,6 +19,23 @@ type ArrayOfNumberOnly struct {
 	ArrayNumber *[]float32 `json:"ArrayNumber,omitempty"`
 }
 
+// NewArrayOfNumberOnly instantiates a new ArrayOfNumberOnly object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewArrayOfNumberOnly() *ArrayOfNumberOnly {
+    this := ArrayOfNumberOnly{}
+    return &this
+}
+
+// NewArrayOfNumberOnlyWithDefaults instantiates a new ArrayOfNumberOnly object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewArrayOfNumberOnlyWithDefaults() *ArrayOfNumberOnly {
+    this := ArrayOfNumberOnly{}
+    return &this
+}
+
 // GetArrayNumber returns the ArrayNumber field value if set, zero value otherwise.
 func (o *ArrayOfNumberOnly) GetArrayNumber() []float32 {
 	if o == nil || o.ArrayNumber == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_array_test_.go b/samples/client/petstore/go-experimental/go-petstore/model_array_test_.go
index 84123ef137b..545d8338e88 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_array_test_.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_array_test_.go
@@ -21,6 +21,23 @@ type ArrayTest struct {
 	ArrayArrayOfModel *[][]ReadOnlyFirst `json:"array_array_of_model,omitempty"`
 }
 
+// NewArrayTest instantiates a new ArrayTest object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewArrayTest() *ArrayTest {
+    this := ArrayTest{}
+    return &this
+}
+
+// NewArrayTestWithDefaults instantiates a new ArrayTest object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewArrayTestWithDefaults() *ArrayTest {
+    this := ArrayTest{}
+    return &this
+}
+
 // GetArrayOfString returns the ArrayOfString field value if set, zero value otherwise.
 func (o *ArrayTest) GetArrayOfString() []string {
 	if o == nil || o.ArrayOfString == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_big_cat.go b/samples/client/petstore/go-experimental/go-petstore/model_big_cat.go
index 1960c5f32f6..28ba49d4af1 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_big_cat.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_big_cat.go
@@ -20,6 +20,23 @@ type BigCat struct {
 	Kind *string `json:"kind,omitempty"`
 }
 
+// NewBigCat instantiates a new BigCat object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewBigCat() *BigCat {
+    this := BigCat{}
+    return &this
+}
+
+// NewBigCatWithDefaults instantiates a new BigCat object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewBigCatWithDefaults() *BigCat {
+    this := BigCat{}
+    return &this
+}
+
 // GetKind returns the Kind field value if set, zero value otherwise.
 func (o *BigCat) GetKind() string {
 	if o == nil || o.Kind == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_big_cat_all_of.go b/samples/client/petstore/go-experimental/go-petstore/model_big_cat_all_of.go
index 2b1c83d7739..eccdf4fb4a2 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_big_cat_all_of.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_big_cat_all_of.go
@@ -19,6 +19,23 @@ type BigCatAllOf struct {
 	Kind *string `json:"kind,omitempty"`
 }
 
+// NewBigCatAllOf instantiates a new BigCatAllOf object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewBigCatAllOf() *BigCatAllOf {
+    this := BigCatAllOf{}
+    return &this
+}
+
+// NewBigCatAllOfWithDefaults instantiates a new BigCatAllOf object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewBigCatAllOfWithDefaults() *BigCatAllOf {
+    this := BigCatAllOf{}
+    return &this
+}
+
 // GetKind returns the Kind field value if set, zero value otherwise.
 func (o *BigCatAllOf) GetKind() string {
 	if o == nil || o.Kind == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_capitalization.go b/samples/client/petstore/go-experimental/go-petstore/model_capitalization.go
index 8288d903b7b..d1198ae8602 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_capitalization.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_capitalization.go
@@ -25,6 +25,23 @@ type Capitalization struct {
 	ATT_NAME *string `json:"ATT_NAME,omitempty"`
 }
 
+// NewCapitalization instantiates a new Capitalization object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewCapitalization() *Capitalization {
+    this := Capitalization{}
+    return &this
+}
+
+// NewCapitalizationWithDefaults instantiates a new Capitalization object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewCapitalizationWithDefaults() *Capitalization {
+    this := Capitalization{}
+    return &this
+}
+
 // GetSmallCamel returns the SmallCamel field value if set, zero value otherwise.
 func (o *Capitalization) GetSmallCamel() string {
 	if o == nil || o.SmallCamel == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_cat.go b/samples/client/petstore/go-experimental/go-petstore/model_cat.go
index 0303bc0826a..4660d0cca09 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_cat.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_cat.go
@@ -20,6 +20,23 @@ type Cat struct {
 	Declawed *bool `json:"declawed,omitempty"`
 }
 
+// NewCat instantiates a new Cat object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewCat() *Cat {
+    this := Cat{}
+    return &this
+}
+
+// NewCatWithDefaults instantiates a new Cat object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewCatWithDefaults() *Cat {
+    this := Cat{}
+    return &this
+}
+
 // GetDeclawed returns the Declawed field value if set, zero value otherwise.
 func (o *Cat) GetDeclawed() bool {
 	if o == nil || o.Declawed == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_cat_all_of.go b/samples/client/petstore/go-experimental/go-petstore/model_cat_all_of.go
index 60ba5b0259f..27e6189a1e6 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_cat_all_of.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_cat_all_of.go
@@ -19,6 +19,23 @@ type CatAllOf struct {
 	Declawed *bool `json:"declawed,omitempty"`
 }
 
+// NewCatAllOf instantiates a new CatAllOf object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewCatAllOf() *CatAllOf {
+    this := CatAllOf{}
+    return &this
+}
+
+// NewCatAllOfWithDefaults instantiates a new CatAllOf object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewCatAllOfWithDefaults() *CatAllOf {
+    this := CatAllOf{}
+    return &this
+}
+
 // GetDeclawed returns the Declawed field value if set, zero value otherwise.
 func (o *CatAllOf) GetDeclawed() bool {
 	if o == nil || o.Declawed == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_category.go b/samples/client/petstore/go-experimental/go-petstore/model_category.go
index 0bf8c0a2fd2..f3a22034c48 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_category.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_category.go
@@ -20,6 +20,26 @@ type Category struct {
 	Name string `json:"name"`
 }
 
+// NewCategory instantiates a new Category object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewCategory(name string, ) *Category {
+    this := Category{}
+    this.Name = name
+    return &this
+}
+
+// NewCategoryWithDefaults instantiates a new Category object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewCategoryWithDefaults() *Category {
+    this := Category{}
+    var name string = "default-name"
+    this.Name = name
+    return &this
+}
+
 // GetId returns the Id field value if set, zero value otherwise.
 func (o *Category) GetId() int64 {
 	if o == nil || o.Id == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_class_model.go b/samples/client/petstore/go-experimental/go-petstore/model_class_model.go
index 1621fc4acbd..cdc48b1bd9d 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_class_model.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_class_model.go
@@ -19,6 +19,23 @@ type ClassModel struct {
 	Class *string `json:"_class,omitempty"`
 }
 
+// NewClassModel instantiates a new ClassModel object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewClassModel() *ClassModel {
+    this := ClassModel{}
+    return &this
+}
+
+// NewClassModelWithDefaults instantiates a new ClassModel object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewClassModelWithDefaults() *ClassModel {
+    this := ClassModel{}
+    return &this
+}
+
 // GetClass returns the Class field value if set, zero value otherwise.
 func (o *ClassModel) GetClass() string {
 	if o == nil || o.Class == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_client.go b/samples/client/petstore/go-experimental/go-petstore/model_client.go
index 45f3fce18b4..447c7e2da53 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_client.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_client.go
@@ -19,6 +19,23 @@ type Client struct {
 	Client *string `json:"client,omitempty"`
 }
 
+// NewClient instantiates a new Client object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewClient() *Client {
+    this := Client{}
+    return &this
+}
+
+// NewClientWithDefaults instantiates a new Client object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewClientWithDefaults() *Client {
+    this := Client{}
+    return &this
+}
+
 // GetClient returns the Client field value if set, zero value otherwise.
 func (o *Client) GetClient() string {
 	if o == nil || o.Client == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_dog.go b/samples/client/petstore/go-experimental/go-petstore/model_dog.go
index 17682057389..4bbfbc208de 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_dog.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_dog.go
@@ -20,6 +20,23 @@ type Dog struct {
 	Breed *string `json:"breed,omitempty"`
 }
 
+// NewDog instantiates a new Dog object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewDog() *Dog {
+    this := Dog{}
+    return &this
+}
+
+// NewDogWithDefaults instantiates a new Dog object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewDogWithDefaults() *Dog {
+    this := Dog{}
+    return &this
+}
+
 // GetBreed returns the Breed field value if set, zero value otherwise.
 func (o *Dog) GetBreed() string {
 	if o == nil || o.Breed == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_dog_all_of.go b/samples/client/petstore/go-experimental/go-petstore/model_dog_all_of.go
index c88dfaca2e0..27cc1210b4b 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_dog_all_of.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_dog_all_of.go
@@ -19,6 +19,23 @@ type DogAllOf struct {
 	Breed *string `json:"breed,omitempty"`
 }
 
+// NewDogAllOf instantiates a new DogAllOf object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewDogAllOf() *DogAllOf {
+    this := DogAllOf{}
+    return &this
+}
+
+// NewDogAllOfWithDefaults instantiates a new DogAllOf object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewDogAllOfWithDefaults() *DogAllOf {
+    this := DogAllOf{}
+    return &this
+}
+
 // GetBreed returns the Breed field value if set, zero value otherwise.
 func (o *DogAllOf) GetBreed() string {
 	if o == nil || o.Breed == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_enum_arrays.go b/samples/client/petstore/go-experimental/go-petstore/model_enum_arrays.go
index 181a9287220..fe411a091b5 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_enum_arrays.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_enum_arrays.go
@@ -20,6 +20,23 @@ type EnumArrays struct {
 	ArrayEnum *[]string `json:"array_enum,omitempty"`
 }
 
+// NewEnumArrays instantiates a new EnumArrays object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewEnumArrays() *EnumArrays {
+    this := EnumArrays{}
+    return &this
+}
+
+// NewEnumArraysWithDefaults instantiates a new EnumArrays object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewEnumArraysWithDefaults() *EnumArrays {
+    this := EnumArrays{}
+    return &this
+}
+
 // GetJustSymbol returns the JustSymbol field value if set, zero value otherwise.
 func (o *EnumArrays) GetJustSymbol() string {
 	if o == nil || o.JustSymbol == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_enum_test_.go b/samples/client/petstore/go-experimental/go-petstore/model_enum_test_.go
index c774c9b8f4f..322b3cc7599 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_enum_test_.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_enum_test_.go
@@ -23,6 +23,24 @@ type EnumTest struct {
 	OuterEnum *OuterEnum `json:"outerEnum,omitempty"`
 }
 
+// NewEnumTest instantiates a new EnumTest object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewEnumTest(enumStringRequired string, ) *EnumTest {
+    this := EnumTest{}
+    this.EnumStringRequired = enumStringRequired
+    return &this
+}
+
+// NewEnumTestWithDefaults instantiates a new EnumTest object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewEnumTestWithDefaults() *EnumTest {
+    this := EnumTest{}
+    return &this
+}
+
 // GetEnumString returns the EnumString field value if set, zero value otherwise.
 func (o *EnumTest) GetEnumString() string {
 	if o == nil || o.EnumString == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_file.go b/samples/client/petstore/go-experimental/go-petstore/model_file.go
index 23da628abcc..82e4bc173f8 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_file.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_file.go
@@ -20,6 +20,23 @@ type File struct {
 	SourceURI *string `json:"sourceURI,omitempty"`
 }
 
+// NewFile instantiates a new File object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewFile() *File {
+    this := File{}
+    return &this
+}
+
+// NewFileWithDefaults instantiates a new File object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewFileWithDefaults() *File {
+    this := File{}
+    return &this
+}
+
 // GetSourceURI returns the SourceURI field value if set, zero value otherwise.
 func (o *File) GetSourceURI() string {
 	if o == nil || o.SourceURI == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_file_schema_test_class.go b/samples/client/petstore/go-experimental/go-petstore/model_file_schema_test_class.go
index 50145af1223..74fbd77e22d 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_file_schema_test_class.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_file_schema_test_class.go
@@ -20,6 +20,23 @@ type FileSchemaTestClass struct {
 	Files *[]File `json:"files,omitempty"`
 }
 
+// NewFileSchemaTestClass instantiates a new FileSchemaTestClass object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewFileSchemaTestClass() *FileSchemaTestClass {
+    this := FileSchemaTestClass{}
+    return &this
+}
+
+// NewFileSchemaTestClassWithDefaults instantiates a new FileSchemaTestClass object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewFileSchemaTestClassWithDefaults() *FileSchemaTestClass {
+    this := FileSchemaTestClass{}
+    return &this
+}
+
 // GetFile returns the File field value if set, zero value otherwise.
 func (o *FileSchemaTestClass) GetFile() File {
 	if o == nil || o.File == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_format_test_.go b/samples/client/petstore/go-experimental/go-petstore/model_format_test_.go
index 608a083d7eb..18255609dc9 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_format_test_.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_format_test_.go
@@ -34,6 +34,27 @@ type FormatTest struct {
 	BigDecimal *float64 `json:"BigDecimal,omitempty"`
 }
 
+// NewFormatTest instantiates a new FormatTest object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewFormatTest(number float32, byte_ string, date string, password string, ) *FormatTest {
+    this := FormatTest{}
+    this.Number = number
+    this.Byte = byte_
+    this.Date = date
+    this.Password = password
+    return &this
+}
+
+// NewFormatTestWithDefaults instantiates a new FormatTest object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewFormatTestWithDefaults() *FormatTest {
+    this := FormatTest{}
+    return &this
+}
+
 // GetInteger returns the Integer field value if set, zero value otherwise.
 func (o *FormatTest) GetInteger() int32 {
 	if o == nil || o.Integer == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_has_only_read_only.go b/samples/client/petstore/go-experimental/go-petstore/model_has_only_read_only.go
index 5394aa4007d..b6d1dd64eee 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_has_only_read_only.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_has_only_read_only.go
@@ -20,6 +20,23 @@ type HasOnlyReadOnly struct {
 	Foo *string `json:"foo,omitempty"`
 }
 
+// NewHasOnlyReadOnly instantiates a new HasOnlyReadOnly object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewHasOnlyReadOnly() *HasOnlyReadOnly {
+    this := HasOnlyReadOnly{}
+    return &this
+}
+
+// NewHasOnlyReadOnlyWithDefaults instantiates a new HasOnlyReadOnly object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewHasOnlyReadOnlyWithDefaults() *HasOnlyReadOnly {
+    this := HasOnlyReadOnly{}
+    return &this
+}
+
 // GetBar returns the Bar field value if set, zero value otherwise.
 func (o *HasOnlyReadOnly) GetBar() string {
 	if o == nil || o.Bar == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_list.go b/samples/client/petstore/go-experimental/go-petstore/model_list.go
index 6259d7507a3..228c9d61fba 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_list.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_list.go
@@ -19,6 +19,23 @@ type List struct {
 	Var123List *string `json:"123-list,omitempty"`
 }
 
+// NewList instantiates a new List object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewList() *List {
+    this := List{}
+    return &this
+}
+
+// NewListWithDefaults instantiates a new List object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewListWithDefaults() *List {
+    this := List{}
+    return &this
+}
+
 // GetVar123List returns the Var123List field value if set, zero value otherwise.
 func (o *List) GetVar123List() string {
 	if o == nil || o.Var123List == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_map_test_.go b/samples/client/petstore/go-experimental/go-petstore/model_map_test_.go
index 820f2641347..e78ae4bf9b8 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_map_test_.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_map_test_.go
@@ -22,6 +22,23 @@ type MapTest struct {
 	IndirectMap *map[string]bool `json:"indirect_map,omitempty"`
 }
 
+// NewMapTest instantiates a new MapTest object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewMapTest() *MapTest {
+    this := MapTest{}
+    return &this
+}
+
+// NewMapTestWithDefaults instantiates a new MapTest object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewMapTestWithDefaults() *MapTest {
+    this := MapTest{}
+    return &this
+}
+
 // GetMapMapOfString returns the MapMapOfString field value if set, zero value otherwise.
 func (o *MapTest) GetMapMapOfString() map[string]map[string]string {
 	if o == nil || o.MapMapOfString == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_mixed_properties_and_additional_properties_class.go b/samples/client/petstore/go-experimental/go-petstore/model_mixed_properties_and_additional_properties_class.go
index c4a7dba8182..95a311b6543 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_mixed_properties_and_additional_properties_class.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_mixed_properties_and_additional_properties_class.go
@@ -22,6 +22,23 @@ type MixedPropertiesAndAdditionalPropertiesClass struct {
 	Map *map[string]Animal `json:"map,omitempty"`
 }
 
+// NewMixedPropertiesAndAdditionalPropertiesClass instantiates a new MixedPropertiesAndAdditionalPropertiesClass object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewMixedPropertiesAndAdditionalPropertiesClass() *MixedPropertiesAndAdditionalPropertiesClass {
+    this := MixedPropertiesAndAdditionalPropertiesClass{}
+    return &this
+}
+
+// NewMixedPropertiesAndAdditionalPropertiesClassWithDefaults instantiates a new MixedPropertiesAndAdditionalPropertiesClass object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewMixedPropertiesAndAdditionalPropertiesClassWithDefaults() *MixedPropertiesAndAdditionalPropertiesClass {
+    this := MixedPropertiesAndAdditionalPropertiesClass{}
+    return &this
+}
+
 // GetUuid returns the Uuid field value if set, zero value otherwise.
 func (o *MixedPropertiesAndAdditionalPropertiesClass) GetUuid() string {
 	if o == nil || o.Uuid == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_name.go b/samples/client/petstore/go-experimental/go-petstore/model_name.go
index 2f3716aad24..c205987518c 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_name.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_name.go
@@ -22,6 +22,24 @@ type Name struct {
 	Var123Number *int32 `json:"123Number,omitempty"`
 }
 
+// NewName instantiates a new Name object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewName(name int32, ) *Name {
+    this := Name{}
+    this.Name = name
+    return &this
+}
+
+// NewNameWithDefaults instantiates a new Name object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewNameWithDefaults() *Name {
+    this := Name{}
+    return &this
+}
+
 // GetName returns the Name field value
 func (o *Name) GetName() int32 {
 	if o == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_number_only.go b/samples/client/petstore/go-experimental/go-petstore/model_number_only.go
index afa9c1b403a..576dcff8040 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_number_only.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_number_only.go
@@ -19,6 +19,23 @@ type NumberOnly struct {
 	JustNumber *float32 `json:"JustNumber,omitempty"`
 }
 
+// NewNumberOnly instantiates a new NumberOnly object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewNumberOnly() *NumberOnly {
+    this := NumberOnly{}
+    return &this
+}
+
+// NewNumberOnlyWithDefaults instantiates a new NumberOnly object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewNumberOnlyWithDefaults() *NumberOnly {
+    this := NumberOnly{}
+    return &this
+}
+
 // GetJustNumber returns the JustNumber field value if set, zero value otherwise.
 func (o *NumberOnly) GetJustNumber() float32 {
 	if o == nil || o.JustNumber == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_order.go b/samples/client/petstore/go-experimental/go-petstore/model_order.go
index 448d6a975a4..aa4da6cf1b7 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_order.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_order.go
@@ -26,6 +26,27 @@ type Order struct {
 	Complete *bool `json:"complete,omitempty"`
 }
 
+// NewOrder instantiates a new Order object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewOrder() *Order {
+    this := Order{}
+    var complete bool = false
+    this.Complete = &complete
+    return &this
+}
+
+// NewOrderWithDefaults instantiates a new Order object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewOrderWithDefaults() *Order {
+    this := Order{}
+    var complete bool = false
+    this.Complete = &complete
+    return &this
+}
+
 // GetId returns the Id field value if set, zero value otherwise.
 func (o *Order) GetId() int64 {
 	if o == nil || o.Id == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_outer_composite.go b/samples/client/petstore/go-experimental/go-petstore/model_outer_composite.go
index 423d3e5ad37..a9a28d74233 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_outer_composite.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_outer_composite.go
@@ -21,6 +21,23 @@ type OuterComposite struct {
 	MyBoolean *bool `json:"my_boolean,omitempty"`
 }
 
+// NewOuterComposite instantiates a new OuterComposite object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewOuterComposite() *OuterComposite {
+    this := OuterComposite{}
+    return &this
+}
+
+// NewOuterCompositeWithDefaults instantiates a new OuterComposite object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewOuterCompositeWithDefaults() *OuterComposite {
+    this := OuterComposite{}
+    return &this
+}
+
 // GetMyNumber returns the MyNumber field value if set, zero value otherwise.
 func (o *OuterComposite) GetMyNumber() float32 {
 	if o == nil || o.MyNumber == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_pet.go b/samples/client/petstore/go-experimental/go-petstore/model_pet.go
index 7c1228c8b61..be788718449 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_pet.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_pet.go
@@ -25,6 +25,25 @@ type Pet struct {
 	Status *string `json:"status,omitempty"`
 }
 
+// NewPet instantiates a new Pet object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewPet(name string, photoUrls []string, ) *Pet {
+    this := Pet{}
+    this.Name = name
+    this.PhotoUrls = photoUrls
+    return &this
+}
+
+// NewPetWithDefaults instantiates a new Pet object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewPetWithDefaults() *Pet {
+    this := Pet{}
+    return &this
+}
+
 // GetId returns the Id field value if set, zero value otherwise.
 func (o *Pet) GetId() int64 {
 	if o == nil || o.Id == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_read_only_first.go b/samples/client/petstore/go-experimental/go-petstore/model_read_only_first.go
index 424ef8b81f3..d2668d83041 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_read_only_first.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_read_only_first.go
@@ -20,6 +20,23 @@ type ReadOnlyFirst struct {
 	Baz *string `json:"baz,omitempty"`
 }
 
+// NewReadOnlyFirst instantiates a new ReadOnlyFirst object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewReadOnlyFirst() *ReadOnlyFirst {
+    this := ReadOnlyFirst{}
+    return &this
+}
+
+// NewReadOnlyFirstWithDefaults instantiates a new ReadOnlyFirst object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewReadOnlyFirstWithDefaults() *ReadOnlyFirst {
+    this := ReadOnlyFirst{}
+    return &this
+}
+
 // GetBar returns the Bar field value if set, zero value otherwise.
 func (o *ReadOnlyFirst) GetBar() string {
 	if o == nil || o.Bar == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_return.go b/samples/client/petstore/go-experimental/go-petstore/model_return.go
index 785303c992d..304c5ffafee 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_return.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_return.go
@@ -19,6 +19,23 @@ type Return struct {
 	Return *int32 `json:"return,omitempty"`
 }
 
+// NewReturn instantiates a new Return object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewReturn() *Return {
+    this := Return{}
+    return &this
+}
+
+// NewReturnWithDefaults instantiates a new Return object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewReturnWithDefaults() *Return {
+    this := Return{}
+    return &this
+}
+
 // GetReturn returns the Return field value if set, zero value otherwise.
 func (o *Return) GetReturn() int32 {
 	if o == nil || o.Return == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_special_model_name.go b/samples/client/petstore/go-experimental/go-petstore/model_special_model_name.go
index e1827cee896..90de43b900f 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_special_model_name.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_special_model_name.go
@@ -19,6 +19,23 @@ type SpecialModelName struct {
 	SpecialPropertyName *int64 `json:"$special[property.name],omitempty"`
 }
 
+// NewSpecialModelName instantiates a new SpecialModelName object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewSpecialModelName() *SpecialModelName {
+    this := SpecialModelName{}
+    return &this
+}
+
+// NewSpecialModelNameWithDefaults instantiates a new SpecialModelName object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewSpecialModelNameWithDefaults() *SpecialModelName {
+    this := SpecialModelName{}
+    return &this
+}
+
 // GetSpecialPropertyName returns the SpecialPropertyName field value if set, zero value otherwise.
 func (o *SpecialModelName) GetSpecialPropertyName() int64 {
 	if o == nil || o.SpecialPropertyName == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_tag.go b/samples/client/petstore/go-experimental/go-petstore/model_tag.go
index bcb30265ab2..abfc6737323 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_tag.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_tag.go
@@ -20,6 +20,23 @@ type Tag struct {
 	Name *string `json:"name,omitempty"`
 }
 
+// NewTag instantiates a new Tag object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewTag() *Tag {
+    this := Tag{}
+    return &this
+}
+
+// NewTagWithDefaults instantiates a new Tag object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewTagWithDefaults() *Tag {
+    this := Tag{}
+    return &this
+}
+
 // GetId returns the Id field value if set, zero value otherwise.
 func (o *Tag) GetId() int64 {
 	if o == nil || o.Id == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_type_holder_default.go b/samples/client/petstore/go-experimental/go-petstore/model_type_holder_default.go
index e57edcc4aa6..5ee112c7218 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_type_holder_default.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_type_holder_default.go
@@ -23,6 +23,32 @@ type TypeHolderDefault struct {
 	ArrayItem []int32 `json:"array_item"`
 }
 
+// NewTypeHolderDefault instantiates a new TypeHolderDefault object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewTypeHolderDefault(stringItem string, numberItem float32, integerItem int32, boolItem bool, arrayItem []int32, ) *TypeHolderDefault {
+    this := TypeHolderDefault{}
+    this.StringItem = stringItem
+    this.NumberItem = numberItem
+    this.IntegerItem = integerItem
+    this.BoolItem = boolItem
+    this.ArrayItem = arrayItem
+    return &this
+}
+
+// NewTypeHolderDefaultWithDefaults instantiates a new TypeHolderDefault object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewTypeHolderDefaultWithDefaults() *TypeHolderDefault {
+    this := TypeHolderDefault{}
+    var stringItem string = "what"
+    this.StringItem = stringItem
+    var boolItem bool = true
+    this.BoolItem = boolItem
+    return &this
+}
+
 // GetStringItem returns the StringItem field value
 func (o *TypeHolderDefault) GetStringItem() string {
 	if o == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_type_holder_example.go b/samples/client/petstore/go-experimental/go-petstore/model_type_holder_example.go
index 3837bcdbb60..d5b4e3e5a28 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_type_holder_example.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_type_holder_example.go
@@ -24,6 +24,29 @@ type TypeHolderExample struct {
 	ArrayItem []int32 `json:"array_item"`
 }
 
+// NewTypeHolderExample instantiates a new TypeHolderExample object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewTypeHolderExample(stringItem string, numberItem float32, floatItem float32, integerItem int32, boolItem bool, arrayItem []int32, ) *TypeHolderExample {
+    this := TypeHolderExample{}
+    this.StringItem = stringItem
+    this.NumberItem = numberItem
+    this.FloatItem = floatItem
+    this.IntegerItem = integerItem
+    this.BoolItem = boolItem
+    this.ArrayItem = arrayItem
+    return &this
+}
+
+// NewTypeHolderExampleWithDefaults instantiates a new TypeHolderExample object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewTypeHolderExampleWithDefaults() *TypeHolderExample {
+    this := TypeHolderExample{}
+    return &this
+}
+
 // GetStringItem returns the StringItem field value
 func (o *TypeHolderExample) GetStringItem() string {
 	if o == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_user.go b/samples/client/petstore/go-experimental/go-petstore/model_user.go
index a427f7f7c24..54ed39fb709 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_user.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_user.go
@@ -27,6 +27,23 @@ type User struct {
 	UserStatus *int32 `json:"userStatus,omitempty"`
 }
 
+// NewUser instantiates a new User object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewUser() *User {
+    this := User{}
+    return &this
+}
+
+// NewUserWithDefaults instantiates a new User object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewUserWithDefaults() *User {
+    this := User{}
+    return &this
+}
+
 // GetId returns the Id field value if set, zero value otherwise.
 func (o *User) GetId() int64 {
 	if o == nil || o.Id == nil {
diff --git a/samples/client/petstore/go-experimental/go-petstore/model_xml_item.go b/samples/client/petstore/go-experimental/go-petstore/model_xml_item.go
index 6f81fca2b94..26addf9c27e 100644
--- a/samples/client/petstore/go-experimental/go-petstore/model_xml_item.go
+++ b/samples/client/petstore/go-experimental/go-petstore/model_xml_item.go
@@ -47,6 +47,23 @@ type XmlItem struct {
 	PrefixNsWrappedArray *[]int32 `json:"prefix_ns_wrapped_array,omitempty"`
 }
 
+// NewXmlItem instantiates a new XmlItem object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewXmlItem() *XmlItem {
+    this := XmlItem{}
+    return &this
+}
+
+// NewXmlItemWithDefaults instantiates a new XmlItem object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewXmlItemWithDefaults() *XmlItem {
+    this := XmlItem{}
+    return &this
+}
+
 // GetAttributeString returns the AttributeString field value if set, zero value otherwise.
 func (o *XmlItem) GetAttributeString() string {
 	if o == nil || o.AttributeString == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesClass.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesClass.md
index 264d926fced..484cf4c0edb 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesClass.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/AdditionalPropertiesClass.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewAdditionalPropertiesClass
+
+`func NewAdditionalPropertiesClass() *AdditionalPropertiesClass`
+
+NewAdditionalPropertiesClass instantiates a new AdditionalPropertiesClass object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewAdditionalPropertiesClassWithDefaults
+
+`func NewAdditionalPropertiesClassWithDefaults() *AdditionalPropertiesClass`
+
+NewAdditionalPropertiesClassWithDefaults instantiates a new AdditionalPropertiesClass object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetMapProperty
 
 `func (o *AdditionalPropertiesClass) GetMapProperty() map[string]string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Animal.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Animal.md
index 55133b29745..8bccff5eb4d 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Animal.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Animal.md
@@ -5,10 +5,27 @@
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **ClassName** | Pointer to **string** |  | 
-**Color** | Pointer to **string** |  | [optional] [default to red]
+**Color** | Pointer to **string** |  | [optional] [default to "red"]
 
 ## Methods
 
+### NewAnimal
+
+`func NewAnimal(className string, ) *Animal`
+
+NewAnimal instantiates a new Animal object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewAnimalWithDefaults
+
+`func NewAnimalWithDefaults() *Animal`
+
+NewAnimalWithDefaults instantiates a new Animal object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetClassName
 
 `func (o *Animal) GetClassName() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ApiResponse.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ApiResponse.md
index b0c891bbc96..aeb34407fa4 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ApiResponse.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ApiResponse.md
@@ -10,6 +10,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewApiResponse
+
+`func NewApiResponse() *ApiResponse`
+
+NewApiResponse instantiates a new ApiResponse object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewApiResponseWithDefaults
+
+`func NewApiResponseWithDefaults() *ApiResponse`
+
+NewApiResponseWithDefaults instantiates a new ApiResponse object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetCode
 
 `func (o *ApiResponse) GetCode() int32`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayOfArrayOfNumberOnly.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayOfArrayOfNumberOnly.md
index 64ad908ea3b..882bdf15eab 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayOfArrayOfNumberOnly.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayOfArrayOfNumberOnly.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewArrayOfArrayOfNumberOnly
+
+`func NewArrayOfArrayOfNumberOnly() *ArrayOfArrayOfNumberOnly`
+
+NewArrayOfArrayOfNumberOnly instantiates a new ArrayOfArrayOfNumberOnly object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewArrayOfArrayOfNumberOnlyWithDefaults
+
+`func NewArrayOfArrayOfNumberOnlyWithDefaults() *ArrayOfArrayOfNumberOnly`
+
+NewArrayOfArrayOfNumberOnlyWithDefaults instantiates a new ArrayOfArrayOfNumberOnly object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetArrayArrayNumber
 
 `func (o *ArrayOfArrayOfNumberOnly) GetArrayArrayNumber() [][]float32`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayOfNumberOnly.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayOfNumberOnly.md
index 0ce95922a5e..7355a0ce13e 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayOfNumberOnly.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayOfNumberOnly.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewArrayOfNumberOnly
+
+`func NewArrayOfNumberOnly() *ArrayOfNumberOnly`
+
+NewArrayOfNumberOnly instantiates a new ArrayOfNumberOnly object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewArrayOfNumberOnlyWithDefaults
+
+`func NewArrayOfNumberOnlyWithDefaults() *ArrayOfNumberOnly`
+
+NewArrayOfNumberOnlyWithDefaults instantiates a new ArrayOfNumberOnly object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetArrayNumber
 
 `func (o *ArrayOfNumberOnly) GetArrayNumber() []float32`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayTest.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayTest.md
index f7020fadea3..e2b623a2412 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayTest.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ArrayTest.md
@@ -10,6 +10,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewArrayTest
+
+`func NewArrayTest() *ArrayTest`
+
+NewArrayTest instantiates a new ArrayTest object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewArrayTestWithDefaults
+
+`func NewArrayTestWithDefaults() *ArrayTest`
+
+NewArrayTestWithDefaults instantiates a new ArrayTest object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetArrayOfString
 
 `func (o *ArrayTest) GetArrayOfString() []string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Capitalization.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Capitalization.md
index a4772d74006..45c74e97903 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Capitalization.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Capitalization.md
@@ -13,6 +13,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewCapitalization
+
+`func NewCapitalization() *Capitalization`
+
+NewCapitalization instantiates a new Capitalization object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewCapitalizationWithDefaults
+
+`func NewCapitalizationWithDefaults() *Capitalization`
+
+NewCapitalizationWithDefaults instantiates a new Capitalization object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetSmallCamel
 
 `func (o *Capitalization) GetSmallCamel() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Cat.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Cat.md
index c7ea3b3adfb..415cabfdce7 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Cat.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Cat.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewCat
+
+`func NewCat() *Cat`
+
+NewCat instantiates a new Cat object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewCatWithDefaults
+
+`func NewCatWithDefaults() *Cat`
+
+NewCatWithDefaults instantiates a new Cat object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetDeclawed
 
 `func (o *Cat) GetDeclawed() bool`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/CatAllOf.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/CatAllOf.md
index 85f40d251d9..62d0919f473 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/CatAllOf.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/CatAllOf.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewCatAllOf
+
+`func NewCatAllOf() *CatAllOf`
+
+NewCatAllOf instantiates a new CatAllOf object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewCatAllOfWithDefaults
+
+`func NewCatAllOfWithDefaults() *CatAllOf`
+
+NewCatAllOfWithDefaults instantiates a new CatAllOf object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetDeclawed
 
 `func (o *CatAllOf) GetDeclawed() bool`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Category.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Category.md
index 88b525bade1..7f77b6cc7a2 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Category.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Category.md
@@ -5,10 +5,27 @@
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **Id** | Pointer to **int64** |  | [optional] 
-**Name** | Pointer to **string** |  | [default to default-name]
+**Name** | Pointer to **string** |  | [default to "default-name"]
 
 ## Methods
 
+### NewCategory
+
+`func NewCategory(name string, ) *Category`
+
+NewCategory instantiates a new Category object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewCategoryWithDefaults
+
+`func NewCategoryWithDefaults() *Category`
+
+NewCategoryWithDefaults instantiates a new Category object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetId
 
 `func (o *Category) GetId() int64`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ClassModel.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ClassModel.md
index d9c4f41e98b..11a115ee706 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ClassModel.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ClassModel.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewClassModel
+
+`func NewClassModel() *ClassModel`
+
+NewClassModel instantiates a new ClassModel object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewClassModelWithDefaults
+
+`func NewClassModelWithDefaults() *ClassModel`
+
+NewClassModelWithDefaults instantiates a new ClassModel object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetClass
 
 `func (o *ClassModel) GetClass() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Client.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Client.md
index 5ed3098fd49..187225fe5ad 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Client.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Client.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewClient
+
+`func NewClient() *Client`
+
+NewClient instantiates a new Client object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewClientWithDefaults
+
+`func NewClientWithDefaults() *Client`
+
+NewClientWithDefaults instantiates a new Client object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetClient
 
 `func (o *Client) GetClient() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Dog.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Dog.md
index ddc5be776dc..1251c1b134f 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Dog.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Dog.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewDog
+
+`func NewDog() *Dog`
+
+NewDog instantiates a new Dog object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewDogWithDefaults
+
+`func NewDogWithDefaults() *Dog`
+
+NewDogWithDefaults instantiates a new Dog object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetBreed
 
 `func (o *Dog) GetBreed() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/DogAllOf.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/DogAllOf.md
index a3169521cec..177637eeaa8 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/DogAllOf.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/DogAllOf.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewDogAllOf
+
+`func NewDogAllOf() *DogAllOf`
+
+NewDogAllOf instantiates a new DogAllOf object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewDogAllOfWithDefaults
+
+`func NewDogAllOfWithDefaults() *DogAllOf`
+
+NewDogAllOfWithDefaults instantiates a new DogAllOf object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetBreed
 
 `func (o *DogAllOf) GetBreed() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/EnumArrays.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/EnumArrays.md
index 31d7b2b9faa..684a0f982b5 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/EnumArrays.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/EnumArrays.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewEnumArrays
+
+`func NewEnumArrays() *EnumArrays`
+
+NewEnumArrays instantiates a new EnumArrays object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewEnumArraysWithDefaults
+
+`func NewEnumArraysWithDefaults() *EnumArrays`
+
+NewEnumArraysWithDefaults instantiates a new EnumArrays object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetJustSymbol
 
 `func (o *EnumArrays) GetJustSymbol() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/EnumTest.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/EnumTest.md
index ef2a67c39ff..5b9e283f079 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/EnumTest.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/EnumTest.md
@@ -10,11 +10,28 @@ Name | Type | Description | Notes
 **EnumNumber** | Pointer to **float64** |  | [optional] 
 **OuterEnum** | Pointer to [**NullableOuterEnum**](OuterEnum.md) |  | [optional] 
 **OuterEnumInteger** | Pointer to [**OuterEnumInteger**](OuterEnumInteger.md) |  | [optional] 
-**OuterEnumDefaultValue** | Pointer to [**OuterEnumDefaultValue**](OuterEnumDefaultValue.md) |  | [optional] 
-**OuterEnumIntegerDefaultValue** | Pointer to [**OuterEnumIntegerDefaultValue**](OuterEnumIntegerDefaultValue.md) |  | [optional] 
+**OuterEnumDefaultValue** | Pointer to [**OuterEnumDefaultValue**](OuterEnumDefaultValue.md) |  | [optional] [default to "placed"]
+**OuterEnumIntegerDefaultValue** | Pointer to [**OuterEnumIntegerDefaultValue**](OuterEnumIntegerDefaultValue.md) |  | [optional] [default to OUTERENUMINTEGERDEFAULTVALUE__0]
 
 ## Methods
 
+### NewEnumTest
+
+`func NewEnumTest(enumStringRequired string, ) *EnumTest`
+
+NewEnumTest instantiates a new EnumTest object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewEnumTestWithDefaults
+
+`func NewEnumTestWithDefaults() *EnumTest`
+
+NewEnumTestWithDefaults instantiates a new EnumTest object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetEnumString
 
 `func (o *EnumTest) GetEnumString() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FakeApi.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FakeApi.md
index ca236912338..e21a291e134 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FakeApi.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FakeApi.md
@@ -398,13 +398,13 @@ Other parameters are passed through a pointer to a apiTestEnumParametersRequest
 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **enumHeaderStringArray** | [**[]string**](string.md) | Header parameter enum test (string array) | 
- **enumHeaderString** | **string** | Header parameter enum test (string) | [default to -efg]
+ **enumHeaderString** | **string** | Header parameter enum test (string) | [default to &quot;-efg&quot;]
  **enumQueryStringArray** | [**[]string**](string.md) | Query parameter enum test (string array) | 
- **enumQueryString** | **string** | Query parameter enum test (string) | [default to -efg]
+ **enumQueryString** | **string** | Query parameter enum test (string) | [default to &quot;-efg&quot;]
  **enumQueryInteger** | **int32** | Query parameter enum test (double) | 
  **enumQueryDouble** | **float64** | Query parameter enum test (double) | 
- **enumFormStringArray** | [**[]string**](string.md) | Form parameter enum test (string array) | [default to $]
- **enumFormString** | **string** | Form parameter enum test (string) | [default to -efg]
+ **enumFormStringArray** | [**[]string**](string.md) | Form parameter enum test (string array) | [default to &quot;$&quot;]
+ **enumFormString** | **string** | Form parameter enum test (string) | [default to &quot;-efg&quot;]
 
 ### Return type
 
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/File.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/File.md
index 454b159609c..507191f19b6 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/File.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/File.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewFile
+
+`func NewFile() *File`
+
+NewFile instantiates a new File object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewFileWithDefaults
+
+`func NewFileWithDefaults() *File`
+
+NewFileWithDefaults instantiates a new File object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetSourceURI
 
 `func (o *File) GetSourceURI() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FileSchemaTestClass.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FileSchemaTestClass.md
index d4a4da7206c..37f671ef8f8 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FileSchemaTestClass.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FileSchemaTestClass.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewFileSchemaTestClass
+
+`func NewFileSchemaTestClass() *FileSchemaTestClass`
+
+NewFileSchemaTestClass instantiates a new FileSchemaTestClass object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewFileSchemaTestClassWithDefaults
+
+`func NewFileSchemaTestClassWithDefaults() *FileSchemaTestClass`
+
+NewFileSchemaTestClassWithDefaults instantiates a new FileSchemaTestClass object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetFile
 
 `func (o *FileSchemaTestClass) GetFile() File`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Foo.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Foo.md
index 82e3c253f2e..cc5a7d167c1 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Foo.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Foo.md
@@ -4,10 +4,27 @@
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**Bar** | Pointer to **string** |  | [optional] [default to bar]
+**Bar** | Pointer to **string** |  | [optional] [default to "bar"]
 
 ## Methods
 
+### NewFoo
+
+`func NewFoo() *Foo`
+
+NewFoo instantiates a new Foo object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewFooWithDefaults
+
+`func NewFooWithDefaults() *Foo`
+
+NewFooWithDefaults instantiates a new Foo object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetBar
 
 `func (o *Foo) GetBar() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FormatTest.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FormatTest.md
index 861d7aa3eb1..39ddbd49dd0 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FormatTest.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/FormatTest.md
@@ -22,6 +22,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewFormatTest
+
+`func NewFormatTest(number float32, byte_ string, date string, password string, ) *FormatTest`
+
+NewFormatTest instantiates a new FormatTest object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewFormatTestWithDefaults
+
+`func NewFormatTestWithDefaults() *FormatTest`
+
+NewFormatTestWithDefaults instantiates a new FormatTest object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetInteger
 
 `func (o *FormatTest) GetInteger() int32`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/HasOnlyReadOnly.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/HasOnlyReadOnly.md
index b5502272ce3..84d8266d59f 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/HasOnlyReadOnly.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/HasOnlyReadOnly.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewHasOnlyReadOnly
+
+`func NewHasOnlyReadOnly() *HasOnlyReadOnly`
+
+NewHasOnlyReadOnly instantiates a new HasOnlyReadOnly object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewHasOnlyReadOnlyWithDefaults
+
+`func NewHasOnlyReadOnlyWithDefaults() *HasOnlyReadOnly`
+
+NewHasOnlyReadOnlyWithDefaults instantiates a new HasOnlyReadOnly object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetBar
 
 `func (o *HasOnlyReadOnly) GetBar() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/HealthCheckResult.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/HealthCheckResult.md
index 15ad0d68cc4..e6e68f1ee87 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/HealthCheckResult.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/HealthCheckResult.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewHealthCheckResult
+
+`func NewHealthCheckResult() *HealthCheckResult`
+
+NewHealthCheckResult instantiates a new HealthCheckResult object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewHealthCheckResultWithDefaults
+
+`func NewHealthCheckResultWithDefaults() *HealthCheckResult`
+
+NewHealthCheckResultWithDefaults instantiates a new HealthCheckResult object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetNullableMessage
 
 `func (o *HealthCheckResult) GetNullableMessage() NullableString`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject.md
index 0c93a8999ad..c66650dd342 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewInlineObject
+
+`func NewInlineObject() *InlineObject`
+
+NewInlineObject instantiates a new InlineObject object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewInlineObjectWithDefaults
+
+`func NewInlineObjectWithDefaults() *InlineObject`
+
+NewInlineObjectWithDefaults instantiates a new InlineObject object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *InlineObject) GetName() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject1.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject1.md
index f30ef94a837..1caf7147c74 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject1.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject1.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewInlineObject1
+
+`func NewInlineObject1() *InlineObject1`
+
+NewInlineObject1 instantiates a new InlineObject1 object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewInlineObject1WithDefaults
+
+`func NewInlineObject1WithDefaults() *InlineObject1`
+
+NewInlineObject1WithDefaults instantiates a new InlineObject1 object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetAdditionalMetadata
 
 `func (o *InlineObject1) GetAdditionalMetadata() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject2.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject2.md
index 62a7142a4d0..c2ce332c6dd 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject2.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject2.md
@@ -5,10 +5,27 @@
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **EnumFormStringArray** | Pointer to **[]string** | Form parameter enum test (string array) | [optional] 
-**EnumFormString** | Pointer to **string** | Form parameter enum test (string) | [optional] [default to ENUM_FORM_STRING_EFG]
+**EnumFormString** | Pointer to **string** | Form parameter enum test (string) | [optional] [default to "-efg"]
 
 ## Methods
 
+### NewInlineObject2
+
+`func NewInlineObject2() *InlineObject2`
+
+NewInlineObject2 instantiates a new InlineObject2 object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewInlineObject2WithDefaults
+
+`func NewInlineObject2WithDefaults() *InlineObject2`
+
+NewInlineObject2WithDefaults instantiates a new InlineObject2 object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetEnumFormStringArray
 
 `func (o *InlineObject2) GetEnumFormStringArray() []string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject3.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject3.md
index 911b0ffb918..4511d3c1640 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject3.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject3.md
@@ -21,6 +21,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewInlineObject3
+
+`func NewInlineObject3(number float32, double float64, patternWithoutDelimiter string, byte_ string, ) *InlineObject3`
+
+NewInlineObject3 instantiates a new InlineObject3 object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewInlineObject3WithDefaults
+
+`func NewInlineObject3WithDefaults() *InlineObject3`
+
+NewInlineObject3WithDefaults instantiates a new InlineObject3 object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetInteger
 
 `func (o *InlineObject3) GetInteger() int32`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject4.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject4.md
index 8316407b652..b555af12b9c 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject4.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject4.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewInlineObject4
+
+`func NewInlineObject4(param string, param2 string, ) *InlineObject4`
+
+NewInlineObject4 instantiates a new InlineObject4 object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewInlineObject4WithDefaults
+
+`func NewInlineObject4WithDefaults() *InlineObject4`
+
+NewInlineObject4WithDefaults instantiates a new InlineObject4 object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetParam
 
 `func (o *InlineObject4) GetParam() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject5.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject5.md
index 24aa799df39..874abaef97e 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject5.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineObject5.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewInlineObject5
+
+`func NewInlineObject5(requiredFile *os.File, ) *InlineObject5`
+
+NewInlineObject5 instantiates a new InlineObject5 object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewInlineObject5WithDefaults
+
+`func NewInlineObject5WithDefaults() *InlineObject5`
+
+NewInlineObject5WithDefaults instantiates a new InlineObject5 object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetAdditionalMetadata
 
 `func (o *InlineObject5) GetAdditionalMetadata() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineResponseDefault.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineResponseDefault.md
index 714067d561b..14f1b0493b7 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineResponseDefault.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/InlineResponseDefault.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewInlineResponseDefault
+
+`func NewInlineResponseDefault() *InlineResponseDefault`
+
+NewInlineResponseDefault instantiates a new InlineResponseDefault object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewInlineResponseDefaultWithDefaults
+
+`func NewInlineResponseDefaultWithDefaults() *InlineResponseDefault`
+
+NewInlineResponseDefaultWithDefaults instantiates a new InlineResponseDefault object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetString
 
 `func (o *InlineResponseDefault) GetString() Foo`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/List.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/List.md
index ca8849936e7..4d914555e33 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/List.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/List.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewList
+
+`func NewList() *List`
+
+NewList instantiates a new List object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewListWithDefaults
+
+`func NewListWithDefaults() *List`
+
+NewListWithDefaults instantiates a new List object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetVar123List
 
 `func (o *List) GetVar123List() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/MapTest.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/MapTest.md
index 6c84c2e89c2..c752f6e86b5 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/MapTest.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/MapTest.md
@@ -11,6 +11,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewMapTest
+
+`func NewMapTest() *MapTest`
+
+NewMapTest instantiates a new MapTest object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewMapTestWithDefaults
+
+`func NewMapTestWithDefaults() *MapTest`
+
+NewMapTestWithDefaults instantiates a new MapTest object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetMapMapOfString
 
 `func (o *MapTest) GetMapMapOfString() map[string]map[string]string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/MixedPropertiesAndAdditionalPropertiesClass.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/MixedPropertiesAndAdditionalPropertiesClass.md
index 49f7c8eb768..2a1eb5eaba3 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/MixedPropertiesAndAdditionalPropertiesClass.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/MixedPropertiesAndAdditionalPropertiesClass.md
@@ -10,6 +10,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewMixedPropertiesAndAdditionalPropertiesClass
+
+`func NewMixedPropertiesAndAdditionalPropertiesClass() *MixedPropertiesAndAdditionalPropertiesClass`
+
+NewMixedPropertiesAndAdditionalPropertiesClass instantiates a new MixedPropertiesAndAdditionalPropertiesClass object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewMixedPropertiesAndAdditionalPropertiesClassWithDefaults
+
+`func NewMixedPropertiesAndAdditionalPropertiesClassWithDefaults() *MixedPropertiesAndAdditionalPropertiesClass`
+
+NewMixedPropertiesAndAdditionalPropertiesClassWithDefaults instantiates a new MixedPropertiesAndAdditionalPropertiesClass object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetUuid
 
 `func (o *MixedPropertiesAndAdditionalPropertiesClass) GetUuid() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Model200Response.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Model200Response.md
index d0bde7b7f7b..00bce3a9909 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Model200Response.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Model200Response.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewModel200Response
+
+`func NewModel200Response() *Model200Response`
+
+NewModel200Response instantiates a new Model200Response object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewModel200ResponseWithDefaults
+
+`func NewModel200ResponseWithDefaults() *Model200Response`
+
+NewModel200ResponseWithDefaults instantiates a new Model200Response object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *Model200Response) GetName() int32`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Name.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Name.md
index 6104c42bebd..cbcab366761 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Name.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Name.md
@@ -11,6 +11,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewName
+
+`func NewName(name int32, ) *Name`
+
+NewName instantiates a new Name object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewNameWithDefaults
+
+`func NewNameWithDefaults() *Name`
+
+NewNameWithDefaults instantiates a new Name object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetName
 
 `func (o *Name) GetName() int32`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/NullableClass.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/NullableClass.md
index 0aed469d7c7..8c686e6955f 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/NullableClass.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/NullableClass.md
@@ -19,6 +19,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewNullableClass
+
+`func NewNullableClass() *NullableClass`
+
+NewNullableClass instantiates a new NullableClass object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewNullableClassWithDefaults
+
+`func NewNullableClassWithDefaults() *NullableClass`
+
+NewNullableClassWithDefaults instantiates a new NullableClass object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetIntegerProp
 
 `func (o *NullableClass) GetIntegerProp() NullableInt32`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/NumberOnly.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/NumberOnly.md
index c8dcac264c2..2a30b0b1283 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/NumberOnly.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/NumberOnly.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewNumberOnly
+
+`func NewNumberOnly() *NumberOnly`
+
+NewNumberOnly instantiates a new NumberOnly object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewNumberOnlyWithDefaults
+
+`func NewNumberOnlyWithDefaults() *NumberOnly`
+
+NewNumberOnlyWithDefaults instantiates a new NumberOnly object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetJustNumber
 
 `func (o *NumberOnly) GetJustNumber() float32`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Order.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Order.md
index 8aa8bbd1ee5..71bb824a6ca 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Order.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Order.md
@@ -13,6 +13,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewOrder
+
+`func NewOrder() *Order`
+
+NewOrder instantiates a new Order object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewOrderWithDefaults
+
+`func NewOrderWithDefaults() *Order`
+
+NewOrderWithDefaults instantiates a new Order object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetId
 
 `func (o *Order) GetId() int64`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/OuterComposite.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/OuterComposite.md
index f8908022282..e91d7b978ae 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/OuterComposite.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/OuterComposite.md
@@ -10,6 +10,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewOuterComposite
+
+`func NewOuterComposite() *OuterComposite`
+
+NewOuterComposite instantiates a new OuterComposite object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewOuterCompositeWithDefaults
+
+`func NewOuterCompositeWithDefaults() *OuterComposite`
+
+NewOuterCompositeWithDefaults instantiates a new OuterComposite object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetMyNumber
 
 `func (o *OuterComposite) GetMyNumber() float32`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Pet.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Pet.md
index dba9589f9d7..faa1e31e870 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Pet.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Pet.md
@@ -13,6 +13,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewPet
+
+`func NewPet(name string, photoUrls []string, ) *Pet`
+
+NewPet instantiates a new Pet object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewPetWithDefaults
+
+`func NewPetWithDefaults() *Pet`
+
+NewPetWithDefaults instantiates a new Pet object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetId
 
 `func (o *Pet) GetId() int64`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ReadOnlyFirst.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ReadOnlyFirst.md
index ce2ff23bc61..c0ee88a7036 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ReadOnlyFirst.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/ReadOnlyFirst.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewReadOnlyFirst
+
+`func NewReadOnlyFirst() *ReadOnlyFirst`
+
+NewReadOnlyFirst instantiates a new ReadOnlyFirst object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewReadOnlyFirstWithDefaults
+
+`func NewReadOnlyFirstWithDefaults() *ReadOnlyFirst`
+
+NewReadOnlyFirstWithDefaults instantiates a new ReadOnlyFirst object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetBar
 
 `func (o *ReadOnlyFirst) GetBar() string`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Return.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Return.md
index 1facabb6bbf..1437ef84e52 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Return.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Return.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewReturn
+
+`func NewReturn() *Return`
+
+NewReturn instantiates a new Return object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewReturnWithDefaults
+
+`func NewReturnWithDefaults() *Return`
+
+NewReturnWithDefaults instantiates a new Return object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetReturn
 
 `func (o *Return) GetReturn() int32`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/SpecialModelName.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/SpecialModelName.md
index 34d8d8d89c7..c273842c32b 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/SpecialModelName.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/SpecialModelName.md
@@ -8,6 +8,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewSpecialModelName
+
+`func NewSpecialModelName() *SpecialModelName`
+
+NewSpecialModelName instantiates a new SpecialModelName object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewSpecialModelNameWithDefaults
+
+`func NewSpecialModelNameWithDefaults() *SpecialModelName`
+
+NewSpecialModelNameWithDefaults instantiates a new SpecialModelName object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetSpecialPropertyName
 
 `func (o *SpecialModelName) GetSpecialPropertyName() int64`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Tag.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Tag.md
index bf868298a5e..84b8770dac0 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Tag.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/Tag.md
@@ -9,6 +9,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewTag
+
+`func NewTag() *Tag`
+
+NewTag instantiates a new Tag object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewTagWithDefaults
+
+`func NewTagWithDefaults() *Tag`
+
+NewTagWithDefaults instantiates a new Tag object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetId
 
 `func (o *Tag) GetId() int64`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/User.md b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/User.md
index 8b93a65d8ab..e9720af9fb7 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/User.md
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/docs/User.md
@@ -15,6 +15,23 @@ Name | Type | Description | Notes
 
 ## Methods
 
+### NewUser
+
+`func NewUser() *User`
+
+NewUser instantiates a new User object
+This constructor will assign default values to properties that have it defined,
+and makes sure properties required by API are set, but the set of arguments
+will change when the set of required properties is changed
+
+### NewUserWithDefaults
+
+`func NewUserWithDefaults() *User`
+
+NewUserWithDefaults instantiates a new User object
+This constructor will only assign default values to properties that have it defined,
+but it doesn't guarantee that properties required by API are set
+
 ### GetId
 
 `func (o *User) GetId() int64`
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_200_response.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_200_response.go
index b4e9becc59c..8c2c0f493c0 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_200_response.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_200_response.go
@@ -20,6 +20,23 @@ type Model200Response struct {
 	Class *string `json:"class,omitempty"`
 }
 
+// NewModel200Response instantiates a new Model200Response object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewModel200Response() *Model200Response {
+    this := Model200Response{}
+    return &this
+}
+
+// NewModel200ResponseWithDefaults instantiates a new Model200Response object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewModel200ResponseWithDefaults() *Model200Response {
+    this := Model200Response{}
+    return &this
+}
+
 // GetName returns the Name field value if set, zero value otherwise.
 func (o *Model200Response) GetName() int32 {
 	if o == nil || o.Name == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model__special_model_name_.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model__special_model_name_.go
index e1827cee896..90de43b900f 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model__special_model_name_.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model__special_model_name_.go
@@ -19,6 +19,23 @@ type SpecialModelName struct {
 	SpecialPropertyName *int64 `json:"$special[property.name],omitempty"`
 }
 
+// NewSpecialModelName instantiates a new SpecialModelName object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewSpecialModelName() *SpecialModelName {
+    this := SpecialModelName{}
+    return &this
+}
+
+// NewSpecialModelNameWithDefaults instantiates a new SpecialModelName object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewSpecialModelNameWithDefaults() *SpecialModelName {
+    this := SpecialModelName{}
+    return &this
+}
+
 // GetSpecialPropertyName returns the SpecialPropertyName field value if set, zero value otherwise.
 func (o *SpecialModelName) GetSpecialPropertyName() int64 {
 	if o == nil || o.SpecialPropertyName == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_additional_properties_class.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_additional_properties_class.go
index d224074b290..55234aacb77 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_additional_properties_class.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_additional_properties_class.go
@@ -20,6 +20,23 @@ type AdditionalPropertiesClass struct {
 	MapOfMapProperty *map[string]map[string]string `json:"map_of_map_property,omitempty"`
 }
 
+// NewAdditionalPropertiesClass instantiates a new AdditionalPropertiesClass object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewAdditionalPropertiesClass() *AdditionalPropertiesClass {
+    this := AdditionalPropertiesClass{}
+    return &this
+}
+
+// NewAdditionalPropertiesClassWithDefaults instantiates a new AdditionalPropertiesClass object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewAdditionalPropertiesClassWithDefaults() *AdditionalPropertiesClass {
+    this := AdditionalPropertiesClass{}
+    return &this
+}
+
 // GetMapProperty returns the MapProperty field value if set, zero value otherwise.
 func (o *AdditionalPropertiesClass) GetMapProperty() map[string]string {
 	if o == nil || o.MapProperty == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_animal.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_animal.go
index b54f59dbe61..47a4ba3a23a 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_animal.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_animal.go
@@ -20,6 +20,28 @@ type Animal struct {
 	Color *string `json:"color,omitempty"`
 }
 
+// NewAnimal instantiates a new Animal object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewAnimal(className string, ) *Animal {
+    this := Animal{}
+    this.ClassName = className
+    var color string = "red"
+    this.Color = &color
+    return &this
+}
+
+// NewAnimalWithDefaults instantiates a new Animal object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewAnimalWithDefaults() *Animal {
+    this := Animal{}
+    var color string = "red"
+    this.Color = &color
+    return &this
+}
+
 // GetClassName returns the ClassName field value
 func (o *Animal) GetClassName() string {
 	if o == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_api_response.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_api_response.go
index 0b9eab9f759..f150cfafa43 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_api_response.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_api_response.go
@@ -21,6 +21,23 @@ type ApiResponse struct {
 	Message *string `json:"message,omitempty"`
 }
 
+// NewApiResponse instantiates a new ApiResponse object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewApiResponse() *ApiResponse {
+    this := ApiResponse{}
+    return &this
+}
+
+// NewApiResponseWithDefaults instantiates a new ApiResponse object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewApiResponseWithDefaults() *ApiResponse {
+    this := ApiResponse{}
+    return &this
+}
+
 // GetCode returns the Code field value if set, zero value otherwise.
 func (o *ApiResponse) GetCode() int32 {
 	if o == nil || o.Code == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_of_array_of_number_only.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_of_array_of_number_only.go
index f2dbbb1f21e..cc9815c9873 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_of_array_of_number_only.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_of_array_of_number_only.go
@@ -19,6 +19,23 @@ type ArrayOfArrayOfNumberOnly struct {
 	ArrayArrayNumber *[][]float32 `json:"ArrayArrayNumber,omitempty"`
 }
 
+// NewArrayOfArrayOfNumberOnly instantiates a new ArrayOfArrayOfNumberOnly object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewArrayOfArrayOfNumberOnly() *ArrayOfArrayOfNumberOnly {
+    this := ArrayOfArrayOfNumberOnly{}
+    return &this
+}
+
+// NewArrayOfArrayOfNumberOnlyWithDefaults instantiates a new ArrayOfArrayOfNumberOnly object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewArrayOfArrayOfNumberOnlyWithDefaults() *ArrayOfArrayOfNumberOnly {
+    this := ArrayOfArrayOfNumberOnly{}
+    return &this
+}
+
 // GetArrayArrayNumber returns the ArrayArrayNumber field value if set, zero value otherwise.
 func (o *ArrayOfArrayOfNumberOnly) GetArrayArrayNumber() [][]float32 {
 	if o == nil || o.ArrayArrayNumber == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_of_number_only.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_of_number_only.go
index 9268a2ae608..49c1292100d 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_of_number_only.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_of_number_only.go
@@ -19,6 +19,23 @@ type ArrayOfNumberOnly struct {
 	ArrayNumber *[]float32 `json:"ArrayNumber,omitempty"`
 }
 
+// NewArrayOfNumberOnly instantiates a new ArrayOfNumberOnly object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewArrayOfNumberOnly() *ArrayOfNumberOnly {
+    this := ArrayOfNumberOnly{}
+    return &this
+}
+
+// NewArrayOfNumberOnlyWithDefaults instantiates a new ArrayOfNumberOnly object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewArrayOfNumberOnlyWithDefaults() *ArrayOfNumberOnly {
+    this := ArrayOfNumberOnly{}
+    return &this
+}
+
 // GetArrayNumber returns the ArrayNumber field value if set, zero value otherwise.
 func (o *ArrayOfNumberOnly) GetArrayNumber() []float32 {
 	if o == nil || o.ArrayNumber == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_test_.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_test_.go
index 84123ef137b..545d8338e88 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_test_.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_test_.go
@@ -21,6 +21,23 @@ type ArrayTest struct {
 	ArrayArrayOfModel *[][]ReadOnlyFirst `json:"array_array_of_model,omitempty"`
 }
 
+// NewArrayTest instantiates a new ArrayTest object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewArrayTest() *ArrayTest {
+    this := ArrayTest{}
+    return &this
+}
+
+// NewArrayTestWithDefaults instantiates a new ArrayTest object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewArrayTestWithDefaults() *ArrayTest {
+    this := ArrayTest{}
+    return &this
+}
+
 // GetArrayOfString returns the ArrayOfString field value if set, zero value otherwise.
 func (o *ArrayTest) GetArrayOfString() []string {
 	if o == nil || o.ArrayOfString == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_capitalization.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_capitalization.go
index 8288d903b7b..d1198ae8602 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_capitalization.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_capitalization.go
@@ -25,6 +25,23 @@ type Capitalization struct {
 	ATT_NAME *string `json:"ATT_NAME,omitempty"`
 }
 
+// NewCapitalization instantiates a new Capitalization object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewCapitalization() *Capitalization {
+    this := Capitalization{}
+    return &this
+}
+
+// NewCapitalizationWithDefaults instantiates a new Capitalization object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewCapitalizationWithDefaults() *Capitalization {
+    this := Capitalization{}
+    return &this
+}
+
 // GetSmallCamel returns the SmallCamel field value if set, zero value otherwise.
 func (o *Capitalization) GetSmallCamel() string {
 	if o == nil || o.SmallCamel == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_cat.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_cat.go
index 0303bc0826a..4660d0cca09 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_cat.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_cat.go
@@ -20,6 +20,23 @@ type Cat struct {
 	Declawed *bool `json:"declawed,omitempty"`
 }
 
+// NewCat instantiates a new Cat object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewCat() *Cat {
+    this := Cat{}
+    return &this
+}
+
+// NewCatWithDefaults instantiates a new Cat object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewCatWithDefaults() *Cat {
+    this := Cat{}
+    return &this
+}
+
 // GetDeclawed returns the Declawed field value if set, zero value otherwise.
 func (o *Cat) GetDeclawed() bool {
 	if o == nil || o.Declawed == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_cat_all_of.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_cat_all_of.go
index 60ba5b0259f..27e6189a1e6 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_cat_all_of.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_cat_all_of.go
@@ -19,6 +19,23 @@ type CatAllOf struct {
 	Declawed *bool `json:"declawed,omitempty"`
 }
 
+// NewCatAllOf instantiates a new CatAllOf object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewCatAllOf() *CatAllOf {
+    this := CatAllOf{}
+    return &this
+}
+
+// NewCatAllOfWithDefaults instantiates a new CatAllOf object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewCatAllOfWithDefaults() *CatAllOf {
+    this := CatAllOf{}
+    return &this
+}
+
 // GetDeclawed returns the Declawed field value if set, zero value otherwise.
 func (o *CatAllOf) GetDeclawed() bool {
 	if o == nil || o.Declawed == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_category.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_category.go
index 0bf8c0a2fd2..f3a22034c48 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_category.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_category.go
@@ -20,6 +20,26 @@ type Category struct {
 	Name string `json:"name"`
 }
 
+// NewCategory instantiates a new Category object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewCategory(name string, ) *Category {
+    this := Category{}
+    this.Name = name
+    return &this
+}
+
+// NewCategoryWithDefaults instantiates a new Category object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewCategoryWithDefaults() *Category {
+    this := Category{}
+    var name string = "default-name"
+    this.Name = name
+    return &this
+}
+
 // GetId returns the Id field value if set, zero value otherwise.
 func (o *Category) GetId() int64 {
 	if o == nil || o.Id == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_class_model.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_class_model.go
index 1621fc4acbd..cdc48b1bd9d 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_class_model.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_class_model.go
@@ -19,6 +19,23 @@ type ClassModel struct {
 	Class *string `json:"_class,omitempty"`
 }
 
+// NewClassModel instantiates a new ClassModel object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewClassModel() *ClassModel {
+    this := ClassModel{}
+    return &this
+}
+
+// NewClassModelWithDefaults instantiates a new ClassModel object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewClassModelWithDefaults() *ClassModel {
+    this := ClassModel{}
+    return &this
+}
+
 // GetClass returns the Class field value if set, zero value otherwise.
 func (o *ClassModel) GetClass() string {
 	if o == nil || o.Class == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_client.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_client.go
index 45f3fce18b4..447c7e2da53 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_client.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_client.go
@@ -19,6 +19,23 @@ type Client struct {
 	Client *string `json:"client,omitempty"`
 }
 
+// NewClient instantiates a new Client object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewClient() *Client {
+    this := Client{}
+    return &this
+}
+
+// NewClientWithDefaults instantiates a new Client object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewClientWithDefaults() *Client {
+    this := Client{}
+    return &this
+}
+
 // GetClient returns the Client field value if set, zero value otherwise.
 func (o *Client) GetClient() string {
 	if o == nil || o.Client == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_dog.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_dog.go
index 17682057389..4bbfbc208de 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_dog.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_dog.go
@@ -20,6 +20,23 @@ type Dog struct {
 	Breed *string `json:"breed,omitempty"`
 }
 
+// NewDog instantiates a new Dog object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewDog() *Dog {
+    this := Dog{}
+    return &this
+}
+
+// NewDogWithDefaults instantiates a new Dog object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewDogWithDefaults() *Dog {
+    this := Dog{}
+    return &this
+}
+
 // GetBreed returns the Breed field value if set, zero value otherwise.
 func (o *Dog) GetBreed() string {
 	if o == nil || o.Breed == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_dog_all_of.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_dog_all_of.go
index c88dfaca2e0..27cc1210b4b 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_dog_all_of.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_dog_all_of.go
@@ -19,6 +19,23 @@ type DogAllOf struct {
 	Breed *string `json:"breed,omitempty"`
 }
 
+// NewDogAllOf instantiates a new DogAllOf object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewDogAllOf() *DogAllOf {
+    this := DogAllOf{}
+    return &this
+}
+
+// NewDogAllOfWithDefaults instantiates a new DogAllOf object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewDogAllOfWithDefaults() *DogAllOf {
+    this := DogAllOf{}
+    return &this
+}
+
 // GetBreed returns the Breed field value if set, zero value otherwise.
 func (o *DogAllOf) GetBreed() string {
 	if o == nil || o.Breed == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_enum_arrays.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_enum_arrays.go
index 181a9287220..fe411a091b5 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_enum_arrays.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_enum_arrays.go
@@ -20,6 +20,23 @@ type EnumArrays struct {
 	ArrayEnum *[]string `json:"array_enum,omitempty"`
 }
 
+// NewEnumArrays instantiates a new EnumArrays object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewEnumArrays() *EnumArrays {
+    this := EnumArrays{}
+    return &this
+}
+
+// NewEnumArraysWithDefaults instantiates a new EnumArrays object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewEnumArraysWithDefaults() *EnumArrays {
+    this := EnumArrays{}
+    return &this
+}
+
 // GetJustSymbol returns the JustSymbol field value if set, zero value otherwise.
 func (o *EnumArrays) GetJustSymbol() string {
 	if o == nil || o.JustSymbol == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_enum_test_.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_enum_test_.go
index e17990e0e8a..fd2e22d9b4e 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_enum_test_.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_enum_test_.go
@@ -26,6 +26,32 @@ type EnumTest struct {
 	OuterEnumIntegerDefaultValue *OuterEnumIntegerDefaultValue `json:"outerEnumIntegerDefaultValue,omitempty"`
 }
 
+// NewEnumTest instantiates a new EnumTest object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewEnumTest(enumStringRequired string, ) *EnumTest {
+    this := EnumTest{}
+    this.EnumStringRequired = enumStringRequired
+    var outerEnumDefaultValue OuterEnumDefaultValue = "placed"
+    this.OuterEnumDefaultValue = &outerEnumDefaultValue
+    var outerEnumIntegerDefaultValue OuterEnumIntegerDefaultValue = OUTERENUMINTEGERDEFAULTVALUE__0
+    this.OuterEnumIntegerDefaultValue = &outerEnumIntegerDefaultValue
+    return &this
+}
+
+// NewEnumTestWithDefaults instantiates a new EnumTest object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewEnumTestWithDefaults() *EnumTest {
+    this := EnumTest{}
+    var outerEnumDefaultValue OuterEnumDefaultValue = "placed"
+    this.OuterEnumDefaultValue = &outerEnumDefaultValue
+    var outerEnumIntegerDefaultValue OuterEnumIntegerDefaultValue = OUTERENUMINTEGERDEFAULTVALUE__0
+    this.OuterEnumIntegerDefaultValue = &outerEnumIntegerDefaultValue
+    return &this
+}
+
 // GetEnumString returns the EnumString field value if set, zero value otherwise.
 func (o *EnumTest) GetEnumString() string {
 	if o == nil || o.EnumString == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_file.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_file.go
index 23da628abcc..82e4bc173f8 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_file.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_file.go
@@ -20,6 +20,23 @@ type File struct {
 	SourceURI *string `json:"sourceURI,omitempty"`
 }
 
+// NewFile instantiates a new File object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewFile() *File {
+    this := File{}
+    return &this
+}
+
+// NewFileWithDefaults instantiates a new File object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewFileWithDefaults() *File {
+    this := File{}
+    return &this
+}
+
 // GetSourceURI returns the SourceURI field value if set, zero value otherwise.
 func (o *File) GetSourceURI() string {
 	if o == nil || o.SourceURI == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_file_schema_test_class.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_file_schema_test_class.go
index 50145af1223..74fbd77e22d 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_file_schema_test_class.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_file_schema_test_class.go
@@ -20,6 +20,23 @@ type FileSchemaTestClass struct {
 	Files *[]File `json:"files,omitempty"`
 }
 
+// NewFileSchemaTestClass instantiates a new FileSchemaTestClass object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewFileSchemaTestClass() *FileSchemaTestClass {
+    this := FileSchemaTestClass{}
+    return &this
+}
+
+// NewFileSchemaTestClassWithDefaults instantiates a new FileSchemaTestClass object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewFileSchemaTestClassWithDefaults() *FileSchemaTestClass {
+    this := FileSchemaTestClass{}
+    return &this
+}
+
 // GetFile returns the File field value if set, zero value otherwise.
 func (o *FileSchemaTestClass) GetFile() File {
 	if o == nil || o.File == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_foo.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_foo.go
index 4d62649a7fc..fc7b85e49f6 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_foo.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_foo.go
@@ -19,6 +19,27 @@ type Foo struct {
 	Bar *string `json:"bar,omitempty"`
 }
 
+// NewFoo instantiates a new Foo object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewFoo() *Foo {
+    this := Foo{}
+    var bar string = "bar"
+    this.Bar = &bar
+    return &this
+}
+
+// NewFooWithDefaults instantiates a new Foo object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewFooWithDefaults() *Foo {
+    this := Foo{}
+    var bar string = "bar"
+    this.Bar = &bar
+    return &this
+}
+
 // GetBar returns the Bar field value if set, zero value otherwise.
 func (o *Foo) GetBar() string {
 	if o == nil || o.Bar == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_format_test_.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_format_test_.go
index 9bf313a01f6..13ff4514909 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_format_test_.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_format_test_.go
@@ -37,6 +37,27 @@ type FormatTest struct {
 	PatternWithDigitsAndDelimiter *string `json:"pattern_with_digits_and_delimiter,omitempty"`
 }
 
+// NewFormatTest instantiates a new FormatTest object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewFormatTest(number float32, byte_ string, date string, password string, ) *FormatTest {
+    this := FormatTest{}
+    this.Number = number
+    this.Byte = byte_
+    this.Date = date
+    this.Password = password
+    return &this
+}
+
+// NewFormatTestWithDefaults instantiates a new FormatTest object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewFormatTestWithDefaults() *FormatTest {
+    this := FormatTest{}
+    return &this
+}
+
 // GetInteger returns the Integer field value if set, zero value otherwise.
 func (o *FormatTest) GetInteger() int32 {
 	if o == nil || o.Integer == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_has_only_read_only.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_has_only_read_only.go
index 5394aa4007d..b6d1dd64eee 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_has_only_read_only.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_has_only_read_only.go
@@ -20,6 +20,23 @@ type HasOnlyReadOnly struct {
 	Foo *string `json:"foo,omitempty"`
 }
 
+// NewHasOnlyReadOnly instantiates a new HasOnlyReadOnly object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewHasOnlyReadOnly() *HasOnlyReadOnly {
+    this := HasOnlyReadOnly{}
+    return &this
+}
+
+// NewHasOnlyReadOnlyWithDefaults instantiates a new HasOnlyReadOnly object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewHasOnlyReadOnlyWithDefaults() *HasOnlyReadOnly {
+    this := HasOnlyReadOnly{}
+    return &this
+}
+
 // GetBar returns the Bar field value if set, zero value otherwise.
 func (o *HasOnlyReadOnly) GetBar() string {
 	if o == nil || o.Bar == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_health_check_result.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_health_check_result.go
index ad87c93a74c..ec2f9376053 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_health_check_result.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_health_check_result.go
@@ -19,6 +19,23 @@ type HealthCheckResult struct {
 	NullableMessage *NullableString `json:"NullableMessage,omitempty"`
 }
 
+// NewHealthCheckResult instantiates a new HealthCheckResult object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewHealthCheckResult() *HealthCheckResult {
+    this := HealthCheckResult{}
+    return &this
+}
+
+// NewHealthCheckResultWithDefaults instantiates a new HealthCheckResult object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewHealthCheckResultWithDefaults() *HealthCheckResult {
+    this := HealthCheckResult{}
+    return &this
+}
+
 // GetNullableMessage returns the NullableMessage field value if set, zero value otherwise.
 func (o *HealthCheckResult) GetNullableMessage() NullableString {
 	if o == nil || o.NullableMessage == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object.go
index c789be40281..5606db36cc5 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object.go
@@ -22,6 +22,23 @@ type InlineObject struct {
 	Status *string `json:"status,omitempty"`
 }
 
+// NewInlineObject instantiates a new InlineObject object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewInlineObject() *InlineObject {
+    this := InlineObject{}
+    return &this
+}
+
+// NewInlineObjectWithDefaults instantiates a new InlineObject object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewInlineObjectWithDefaults() *InlineObject {
+    this := InlineObject{}
+    return &this
+}
+
 // GetName returns the Name field value if set, zero value otherwise.
 func (o *InlineObject) GetName() string {
 	if o == nil || o.Name == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_1.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_1.go
index f4ad400f832..e7651a59b7b 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_1.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_1.go
@@ -23,6 +23,23 @@ type InlineObject1 struct {
 	File **os.File `json:"file,omitempty"`
 }
 
+// NewInlineObject1 instantiates a new InlineObject1 object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewInlineObject1() *InlineObject1 {
+    this := InlineObject1{}
+    return &this
+}
+
+// NewInlineObject1WithDefaults instantiates a new InlineObject1 object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewInlineObject1WithDefaults() *InlineObject1 {
+    this := InlineObject1{}
+    return &this
+}
+
 // GetAdditionalMetadata returns the AdditionalMetadata field value if set, zero value otherwise.
 func (o *InlineObject1) GetAdditionalMetadata() string {
 	if o == nil || o.AdditionalMetadata == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_2.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_2.go
index 2734be44f5d..3e667da5f07 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_2.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_2.go
@@ -22,6 +22,27 @@ type InlineObject2 struct {
 	EnumFormString *string `json:"enum_form_string,omitempty"`
 }
 
+// NewInlineObject2 instantiates a new InlineObject2 object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewInlineObject2() *InlineObject2 {
+    this := InlineObject2{}
+    var enumFormString string = "-efg"
+    this.EnumFormString = &enumFormString
+    return &this
+}
+
+// NewInlineObject2WithDefaults instantiates a new InlineObject2 object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewInlineObject2WithDefaults() *InlineObject2 {
+    this := InlineObject2{}
+    var enumFormString string = "-efg"
+    this.EnumFormString = &enumFormString
+    return &this
+}
+
 // GetEnumFormStringArray returns the EnumFormStringArray field value if set, zero value otherwise.
 func (o *InlineObject2) GetEnumFormStringArray() []string {
 	if o == nil || o.EnumFormStringArray == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_3.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_3.go
index dece4ad604b..fef3dacc852 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_3.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_3.go
@@ -48,6 +48,27 @@ type InlineObject3 struct {
 	Callback *string `json:"callback,omitempty"`
 }
 
+// NewInlineObject3 instantiates a new InlineObject3 object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewInlineObject3(number float32, double float64, patternWithoutDelimiter string, byte_ string, ) *InlineObject3 {
+    this := InlineObject3{}
+    this.Number = number
+    this.Double = double
+    this.PatternWithoutDelimiter = patternWithoutDelimiter
+    this.Byte = byte_
+    return &this
+}
+
+// NewInlineObject3WithDefaults instantiates a new InlineObject3 object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewInlineObject3WithDefaults() *InlineObject3 {
+    this := InlineObject3{}
+    return &this
+}
+
 // GetInteger returns the Integer field value if set, zero value otherwise.
 func (o *InlineObject3) GetInteger() int32 {
 	if o == nil || o.Integer == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_4.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_4.go
index 837e8f423bf..0f98842c8fb 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_4.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_4.go
@@ -22,6 +22,25 @@ type InlineObject4 struct {
 	Param2 string `json:"param2"`
 }
 
+// NewInlineObject4 instantiates a new InlineObject4 object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewInlineObject4(param string, param2 string, ) *InlineObject4 {
+    this := InlineObject4{}
+    this.Param = param
+    this.Param2 = param2
+    return &this
+}
+
+// NewInlineObject4WithDefaults instantiates a new InlineObject4 object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewInlineObject4WithDefaults() *InlineObject4 {
+    this := InlineObject4{}
+    return &this
+}
+
 // GetParam returns the Param field value
 func (o *InlineObject4) GetParam() string {
 	if o == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_5.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_5.go
index 6673d413276..b623f4cda9e 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_5.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_5.go
@@ -23,6 +23,24 @@ type InlineObject5 struct {
 	RequiredFile *os.File `json:"requiredFile"`
 }
 
+// NewInlineObject5 instantiates a new InlineObject5 object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewInlineObject5(requiredFile *os.File, ) *InlineObject5 {
+    this := InlineObject5{}
+    this.RequiredFile = requiredFile
+    return &this
+}
+
+// NewInlineObject5WithDefaults instantiates a new InlineObject5 object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewInlineObject5WithDefaults() *InlineObject5 {
+    this := InlineObject5{}
+    return &this
+}
+
 // GetAdditionalMetadata returns the AdditionalMetadata field value if set, zero value otherwise.
 func (o *InlineObject5) GetAdditionalMetadata() string {
 	if o == nil || o.AdditionalMetadata == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_response_default.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_response_default.go
index 3d8d72130c5..9134406f6cf 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_response_default.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_response_default.go
@@ -19,6 +19,23 @@ type InlineResponseDefault struct {
 	String *Foo `json:"string,omitempty"`
 }
 
+// NewInlineResponseDefault instantiates a new InlineResponseDefault object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewInlineResponseDefault() *InlineResponseDefault {
+    this := InlineResponseDefault{}
+    return &this
+}
+
+// NewInlineResponseDefaultWithDefaults instantiates a new InlineResponseDefault object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewInlineResponseDefaultWithDefaults() *InlineResponseDefault {
+    this := InlineResponseDefault{}
+    return &this
+}
+
 // GetString returns the String field value if set, zero value otherwise.
 func (o *InlineResponseDefault) GetString() Foo {
 	if o == nil || o.String == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_list.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_list.go
index 6259d7507a3..228c9d61fba 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_list.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_list.go
@@ -19,6 +19,23 @@ type List struct {
 	Var123List *string `json:"123-list,omitempty"`
 }
 
+// NewList instantiates a new List object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewList() *List {
+    this := List{}
+    return &this
+}
+
+// NewListWithDefaults instantiates a new List object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewListWithDefaults() *List {
+    this := List{}
+    return &this
+}
+
 // GetVar123List returns the Var123List field value if set, zero value otherwise.
 func (o *List) GetVar123List() string {
 	if o == nil || o.Var123List == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_map_test_.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_map_test_.go
index 820f2641347..e78ae4bf9b8 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_map_test_.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_map_test_.go
@@ -22,6 +22,23 @@ type MapTest struct {
 	IndirectMap *map[string]bool `json:"indirect_map,omitempty"`
 }
 
+// NewMapTest instantiates a new MapTest object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewMapTest() *MapTest {
+    this := MapTest{}
+    return &this
+}
+
+// NewMapTestWithDefaults instantiates a new MapTest object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewMapTestWithDefaults() *MapTest {
+    this := MapTest{}
+    return &this
+}
+
 // GetMapMapOfString returns the MapMapOfString field value if set, zero value otherwise.
 func (o *MapTest) GetMapMapOfString() map[string]map[string]string {
 	if o == nil || o.MapMapOfString == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_mixed_properties_and_additional_properties_class.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_mixed_properties_and_additional_properties_class.go
index c4a7dba8182..95a311b6543 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_mixed_properties_and_additional_properties_class.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_mixed_properties_and_additional_properties_class.go
@@ -22,6 +22,23 @@ type MixedPropertiesAndAdditionalPropertiesClass struct {
 	Map *map[string]Animal `json:"map,omitempty"`
 }
 
+// NewMixedPropertiesAndAdditionalPropertiesClass instantiates a new MixedPropertiesAndAdditionalPropertiesClass object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewMixedPropertiesAndAdditionalPropertiesClass() *MixedPropertiesAndAdditionalPropertiesClass {
+    this := MixedPropertiesAndAdditionalPropertiesClass{}
+    return &this
+}
+
+// NewMixedPropertiesAndAdditionalPropertiesClassWithDefaults instantiates a new MixedPropertiesAndAdditionalPropertiesClass object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewMixedPropertiesAndAdditionalPropertiesClassWithDefaults() *MixedPropertiesAndAdditionalPropertiesClass {
+    this := MixedPropertiesAndAdditionalPropertiesClass{}
+    return &this
+}
+
 // GetUuid returns the Uuid field value if set, zero value otherwise.
 func (o *MixedPropertiesAndAdditionalPropertiesClass) GetUuid() string {
 	if o == nil || o.Uuid == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_name.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_name.go
index 2f3716aad24..c205987518c 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_name.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_name.go
@@ -22,6 +22,24 @@ type Name struct {
 	Var123Number *int32 `json:"123Number,omitempty"`
 }
 
+// NewName instantiates a new Name object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewName(name int32, ) *Name {
+    this := Name{}
+    this.Name = name
+    return &this
+}
+
+// NewNameWithDefaults instantiates a new Name object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewNameWithDefaults() *Name {
+    this := Name{}
+    return &this
+}
+
 // GetName returns the Name field value
 func (o *Name) GetName() int32 {
 	if o == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_nullable_class.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_nullable_class.go
index 2a51bd6a123..41501edeb5e 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_nullable_class.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_nullable_class.go
@@ -30,6 +30,23 @@ type NullableClass struct {
 	ObjectItemsNullable *map[string]map[string]interface{} `json:"object_items_nullable,omitempty"`
 }
 
+// NewNullableClass instantiates a new NullableClass object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewNullableClass() *NullableClass {
+    this := NullableClass{}
+    return &this
+}
+
+// NewNullableClassWithDefaults instantiates a new NullableClass object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewNullableClassWithDefaults() *NullableClass {
+    this := NullableClass{}
+    return &this
+}
+
 // GetIntegerProp returns the IntegerProp field value if set, zero value otherwise.
 func (o *NullableClass) GetIntegerProp() NullableInt32 {
 	if o == nil || o.IntegerProp == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_number_only.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_number_only.go
index afa9c1b403a..576dcff8040 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_number_only.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_number_only.go
@@ -19,6 +19,23 @@ type NumberOnly struct {
 	JustNumber *float32 `json:"JustNumber,omitempty"`
 }
 
+// NewNumberOnly instantiates a new NumberOnly object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewNumberOnly() *NumberOnly {
+    this := NumberOnly{}
+    return &this
+}
+
+// NewNumberOnlyWithDefaults instantiates a new NumberOnly object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewNumberOnlyWithDefaults() *NumberOnly {
+    this := NumberOnly{}
+    return &this
+}
+
 // GetJustNumber returns the JustNumber field value if set, zero value otherwise.
 func (o *NumberOnly) GetJustNumber() float32 {
 	if o == nil || o.JustNumber == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_order.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_order.go
index 448d6a975a4..aa4da6cf1b7 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_order.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_order.go
@@ -26,6 +26,27 @@ type Order struct {
 	Complete *bool `json:"complete,omitempty"`
 }
 
+// NewOrder instantiates a new Order object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewOrder() *Order {
+    this := Order{}
+    var complete bool = false
+    this.Complete = &complete
+    return &this
+}
+
+// NewOrderWithDefaults instantiates a new Order object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewOrderWithDefaults() *Order {
+    this := Order{}
+    var complete bool = false
+    this.Complete = &complete
+    return &this
+}
+
 // GetId returns the Id field value if set, zero value otherwise.
 func (o *Order) GetId() int64 {
 	if o == nil || o.Id == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_outer_composite.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_outer_composite.go
index 423d3e5ad37..a9a28d74233 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_outer_composite.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_outer_composite.go
@@ -21,6 +21,23 @@ type OuterComposite struct {
 	MyBoolean *bool `json:"my_boolean,omitempty"`
 }
 
+// NewOuterComposite instantiates a new OuterComposite object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewOuterComposite() *OuterComposite {
+    this := OuterComposite{}
+    return &this
+}
+
+// NewOuterCompositeWithDefaults instantiates a new OuterComposite object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewOuterCompositeWithDefaults() *OuterComposite {
+    this := OuterComposite{}
+    return &this
+}
+
 // GetMyNumber returns the MyNumber field value if set, zero value otherwise.
 func (o *OuterComposite) GetMyNumber() float32 {
 	if o == nil || o.MyNumber == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_pet.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_pet.go
index 7c1228c8b61..be788718449 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_pet.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_pet.go
@@ -25,6 +25,25 @@ type Pet struct {
 	Status *string `json:"status,omitempty"`
 }
 
+// NewPet instantiates a new Pet object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewPet(name string, photoUrls []string, ) *Pet {
+    this := Pet{}
+    this.Name = name
+    this.PhotoUrls = photoUrls
+    return &this
+}
+
+// NewPetWithDefaults instantiates a new Pet object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewPetWithDefaults() *Pet {
+    this := Pet{}
+    return &this
+}
+
 // GetId returns the Id field value if set, zero value otherwise.
 func (o *Pet) GetId() int64 {
 	if o == nil || o.Id == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_read_only_first.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_read_only_first.go
index 424ef8b81f3..d2668d83041 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_read_only_first.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_read_only_first.go
@@ -20,6 +20,23 @@ type ReadOnlyFirst struct {
 	Baz *string `json:"baz,omitempty"`
 }
 
+// NewReadOnlyFirst instantiates a new ReadOnlyFirst object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewReadOnlyFirst() *ReadOnlyFirst {
+    this := ReadOnlyFirst{}
+    return &this
+}
+
+// NewReadOnlyFirstWithDefaults instantiates a new ReadOnlyFirst object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewReadOnlyFirstWithDefaults() *ReadOnlyFirst {
+    this := ReadOnlyFirst{}
+    return &this
+}
+
 // GetBar returns the Bar field value if set, zero value otherwise.
 func (o *ReadOnlyFirst) GetBar() string {
 	if o == nil || o.Bar == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_return.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_return.go
index 785303c992d..304c5ffafee 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_return.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_return.go
@@ -19,6 +19,23 @@ type Return struct {
 	Return *int32 `json:"return,omitempty"`
 }
 
+// NewReturn instantiates a new Return object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewReturn() *Return {
+    this := Return{}
+    return &this
+}
+
+// NewReturnWithDefaults instantiates a new Return object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewReturnWithDefaults() *Return {
+    this := Return{}
+    return &this
+}
+
 // GetReturn returns the Return field value if set, zero value otherwise.
 func (o *Return) GetReturn() int32 {
 	if o == nil || o.Return == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_tag.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_tag.go
index bcb30265ab2..abfc6737323 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_tag.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_tag.go
@@ -20,6 +20,23 @@ type Tag struct {
 	Name *string `json:"name,omitempty"`
 }
 
+// NewTag instantiates a new Tag object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewTag() *Tag {
+    this := Tag{}
+    return &this
+}
+
+// NewTagWithDefaults instantiates a new Tag object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewTagWithDefaults() *Tag {
+    this := Tag{}
+    return &this
+}
+
 // GetId returns the Id field value if set, zero value otherwise.
 func (o *Tag) GetId() int64 {
 	if o == nil || o.Id == nil {
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_user.go b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_user.go
index a427f7f7c24..54ed39fb709 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/model_user.go
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/model_user.go
@@ -27,6 +27,23 @@ type User struct {
 	UserStatus *int32 `json:"userStatus,omitempty"`
 }
 
+// NewUser instantiates a new User object
+// This constructor will assign default values to properties that have it defined,
+// and makes sure properties required by API are set, but the set of arguments
+// will change when the set of required properties is changed
+func NewUser() *User {
+    this := User{}
+    return &this
+}
+
+// NewUserWithDefaults instantiates a new User object
+// This constructor will only assign default values to properties that have it defined,
+// but it doesn't guarantee that properties required by API are set
+func NewUserWithDefaults() *User {
+    this := User{}
+    return &this
+}
+
 // GetId returns the Id field value if set, zero value otherwise.
 func (o *User) GetId() int64 {
 	if o == nil || o.Id == nil {