[Go] fix unmarshal for models with parents (#6946)

* set disallowAdditionalPropertiesIfNotPresent to false in go exp oas3

* fix unmarshal in go

* remove fields from embedded structs

* fix typo

bin/configs/go-experimental-go-petstore.yaml

@@ -5,3 +5,4 @@ templateDir: modules/openapi-generator/src/main/resources/go-experimental
 additionalProperties:
   enumClassPrefix: "true"
   packageName: petstore
+  disallowAdditionalPropertiesIfNotPresent: false

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/GoClientExperimentalCodegen.java

@@ -242,6 +242,13 @@ public class GoClientExperimentalCodegen extends GoClientCodegen {
                 if (model.anyOf != null && !model.anyOf.isEmpty()) {
                     imports.add(createMapping("import", "fmt"));
                 }
+
+                // additionalProperties: true and parent
+                if (model.isAdditionalPropertiesTrue && model.parent != null && Boolean.FALSE.equals(model.isMapModel)) {
+                    imports.add(createMapping("import", "reflect"));
+                    imports.add(createMapping("import", "strings"));
+                }
+
             }
         }
         return objs;

modules/openapi-generator/src/main/resources/go-experimental/model_simple.mustache

@@ -265,6 +265,72 @@ func (o {{classname}}) MarshalJSON() ([]byte, error) {
 
 {{#isAdditionalPropertiesTrue}}
 func (o *{{{classname}}}) UnmarshalJSON(bytes []byte) (err error) {
+{{#parent}}
+{{^isMapModel}}
+	type {{classname}}WithoutEmbeddedStruct struct {
+	{{#vars}}
+	{{^-first}}
+	{{/-first}}
+	{{#description}}
+		// {{{description}}}
+	{{/description}}
+		{{name}} {{^required}}{{^isNullable}}*{{/isNullable}}{{/required}}{{{dataType}}} `json:"{{baseName}}{{^required}},omitempty{{/required}}"{{#withXml}} xml:"{{baseName}}{{#isXmlAttribute}},attr{{/isXmlAttribute}}"{{/withXml}}{{#vendorExtensions.x-go-custom-tag}} {{{.}}}{{/vendorExtensions.x-go-custom-tag}}`
+	{{/vars}}
+	}
+
+	var{{{classname}}}WithoutEmbeddedStruct := {{{classname}}}WithoutEmbeddedStruct{}
+
+	err = json.Unmarshal(bytes, &var{{{classname}}}WithoutEmbeddedStruct)
+	if err == nil {
+		var{{{classname}}} := _{{{classname}}}{}
+		{{#vars}}
+		var{{{classname}}}.{{{name}}} = var{{{classname}}}WithoutEmbeddedStruct.{{{name}}}
+		{{/vars}}
+		*o = {{{classname}}}(var{{{classname}}})
+	} else {
+		return err
+	}
+
+	var{{{classname}}} := _{{{classname}}}{}
+
+	err = json.Unmarshal(bytes, &var{{{classname}}})
+	if err == nil {
+		o.{{{parent}}} = var{{{classname}}}.{{{parent}}}
+	} else {
+		return err
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		{{#vars}}
+		delete(additionalProperties, "{{{baseName}}}")
+		{{/vars}}
+
+		// remove fields from embedded structs
+		reflect{{{parent}}} := reflect.ValueOf(o.{{{parent}}})
+		for i := 0; i < reflect{{{parent}}}.Type().NumField(); i++ {
+			t := reflect{{{parent}}}.Type().Field(i)
+
+			if jsonTag := t.Tag.Get("json"); jsonTag != "" {
+				fieldName := ""
+				if commaIdx := strings.Index(jsonTag, ","); commaIdx > 0 {
+					fieldName = jsonTag[:commaIdx]
+				} else {
+					fieldName = jsonTag
+				}
+				if fieldName != "AdditionalProperties" {
+					delete(additionalProperties, fieldName)
+				}
+			}
+		}
+
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+{{/isMapModel}}
+{{#isMapModel}}
 	var{{{classname}}} := _{{{classname}}}{}
 
 	if err = json.Unmarshal(bytes, &var{{{classname}}}); err == nil {
@@ -281,6 +347,26 @@ func (o *{{{classname}}}) UnmarshalJSON(bytes []byte) (err error) {
 	}
 
 	return err
+{{/isMapModel}}
+{{/parent}}
+{{^parent}}
+	var{{{classname}}} := _{{{classname}}}{}
+
+	if err = json.Unmarshal(bytes, &var{{{classname}}}); err == nil {
+		*o = {{{classname}}}(var{{{classname}}})
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		{{#vars}}
+		delete(additionalProperties, "{{{baseName}}}")
+		{{/vars}}
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+{{/parent}}
 }
 
 {{/isAdditionalPropertiesTrue}}

samples/openapi3/client/petstore/go-experimental/go-petstore/model_200_response.go

@@ -17,8 +17,11 @@ import (
 type Model200Response struct {
 	Name *int32 `json:"name,omitempty"`
 	Class *string `json:"class,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Model200Response 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
@@ -108,9 +111,32 @@ func (o Model200Response) MarshalJSON() ([]byte, error) {
 	if o.Class != nil {
 		toSerialize["class"] = o.Class
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Model200Response) UnmarshalJSON(bytes []byte) (err error) {
+	varModel200Response := _Model200Response{}
+
+	if err = json.Unmarshal(bytes, &varModel200Response); err == nil {
+		*o = Model200Response(varModel200Response)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "name")
+		delete(additionalProperties, "class")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableModel200Response struct {
 	value *Model200Response
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model__special_model_name_.go

@@ -16,8 +16,11 @@ import (
 // SpecialModelName struct for SpecialModelName
 type SpecialModelName struct {
 	SpecialPropertyName *int64 `json:"$special[property.name],omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _SpecialModelName 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
@@ -72,9 +75,31 @@ func (o SpecialModelName) MarshalJSON() ([]byte, error) {
 	if o.SpecialPropertyName != nil {
 		toSerialize["$special[property.name]"] = o.SpecialPropertyName
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *SpecialModelName) UnmarshalJSON(bytes []byte) (err error) {
+	varSpecialModelName := _SpecialModelName{}
+
+	if err = json.Unmarshal(bytes, &varSpecialModelName); err == nil {
+		*o = SpecialModelName(varSpecialModelName)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "$special[property.name]")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableSpecialModelName struct {
 	value *SpecialModelName
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_additional_properties_class.go

@@ -17,8 +17,11 @@ import (
 type AdditionalPropertiesClass struct {
 	MapProperty *map[string]string `json:"map_property,omitempty"`
 	MapOfMapProperty *map[string]map[string]string `json:"map_of_map_property,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _AdditionalPropertiesClass 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
@@ -108,9 +111,32 @@ func (o AdditionalPropertiesClass) MarshalJSON() ([]byte, error) {
 	if o.MapOfMapProperty != nil {
 		toSerialize["map_of_map_property"] = o.MapOfMapProperty
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *AdditionalPropertiesClass) UnmarshalJSON(bytes []byte) (err error) {
+	varAdditionalPropertiesClass := _AdditionalPropertiesClass{}
+
+	if err = json.Unmarshal(bytes, &varAdditionalPropertiesClass); err == nil {
+		*o = AdditionalPropertiesClass(varAdditionalPropertiesClass)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "map_property")
+		delete(additionalProperties, "map_of_map_property")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableAdditionalPropertiesClass struct {
 	value *AdditionalPropertiesClass
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_animal.go

@@ -17,8 +17,11 @@ import (
 type Animal struct {
 	ClassName string `json:"className"`
 	Color *string `json:"color,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Animal 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
@@ -105,9 +108,32 @@ func (o Animal) MarshalJSON() ([]byte, error) {
 	if o.Color != nil {
 		toSerialize["color"] = o.Color
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Animal) UnmarshalJSON(bytes []byte) (err error) {
+	varAnimal := _Animal{}
+
+	if err = json.Unmarshal(bytes, &varAnimal); err == nil {
+		*o = Animal(varAnimal)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "className")
+		delete(additionalProperties, "color")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableAnimal struct {
 	value *Animal
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_api_response.go

@@ -18,8 +18,11 @@ type ApiResponse struct {
 	Code *int32 `json:"code,omitempty"`
 	Type *string `json:"type,omitempty"`
 	Message *string `json:"message,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _ApiResponse 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
@@ -144,9 +147,33 @@ func (o ApiResponse) MarshalJSON() ([]byte, error) {
 	if o.Message != nil {
 		toSerialize["message"] = o.Message
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *ApiResponse) UnmarshalJSON(bytes []byte) (err error) {
+	varApiResponse := _ApiResponse{}
+
+	if err = json.Unmarshal(bytes, &varApiResponse); err == nil {
+		*o = ApiResponse(varApiResponse)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "code")
+		delete(additionalProperties, "type")
+		delete(additionalProperties, "message")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableApiResponse struct {
 	value *ApiResponse
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_apple.go

@@ -16,8 +16,11 @@ import (
 // Apple struct for Apple
 type Apple struct {
 	Cultivar *string `json:"cultivar,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Apple Apple
+
 // NewApple instantiates a new Apple 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
@@ -72,9 +75,31 @@ func (o Apple) MarshalJSON() ([]byte, error) {
 	if o.Cultivar != nil {
 		toSerialize["cultivar"] = o.Cultivar
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Apple) UnmarshalJSON(bytes []byte) (err error) {
+	varApple := _Apple{}
+
+	if err = json.Unmarshal(bytes, &varApple); err == nil {
+		*o = Apple(varApple)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "cultivar")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableApple struct {
 	value *Apple
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_apple_req.go

@@ -17,8 +17,11 @@ import (
 type AppleReq struct {
 	Cultivar string `json:"cultivar"`
 	Mealy *bool `json:"mealy,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _AppleReq AppleReq
+
 // NewAppleReq instantiates a new AppleReq 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
@@ -101,9 +104,32 @@ func (o AppleReq) MarshalJSON() ([]byte, error) {
 	if o.Mealy != nil {
 		toSerialize["mealy"] = o.Mealy
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *AppleReq) UnmarshalJSON(bytes []byte) (err error) {
+	varAppleReq := _AppleReq{}
+
+	if err = json.Unmarshal(bytes, &varAppleReq); err == nil {
+		*o = AppleReq(varAppleReq)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "cultivar")
+		delete(additionalProperties, "mealy")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableAppleReq struct {
 	value *AppleReq
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_of_array_of_number_only.go

@@ -16,8 +16,11 @@ import (
 // ArrayOfArrayOfNumberOnly struct for ArrayOfArrayOfNumberOnly
 type ArrayOfArrayOfNumberOnly struct {
 	ArrayArrayNumber *[][]float32 `json:"ArrayArrayNumber,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _ArrayOfArrayOfNumberOnly 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
@@ -72,9 +75,31 @@ func (o ArrayOfArrayOfNumberOnly) MarshalJSON() ([]byte, error) {
 	if o.ArrayArrayNumber != nil {
 		toSerialize["ArrayArrayNumber"] = o.ArrayArrayNumber
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *ArrayOfArrayOfNumberOnly) UnmarshalJSON(bytes []byte) (err error) {
+	varArrayOfArrayOfNumberOnly := _ArrayOfArrayOfNumberOnly{}
+
+	if err = json.Unmarshal(bytes, &varArrayOfArrayOfNumberOnly); err == nil {
+		*o = ArrayOfArrayOfNumberOnly(varArrayOfArrayOfNumberOnly)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "ArrayArrayNumber")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableArrayOfArrayOfNumberOnly struct {
 	value *ArrayOfArrayOfNumberOnly
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_of_number_only.go

@@ -16,8 +16,11 @@ import (
 // ArrayOfNumberOnly struct for ArrayOfNumberOnly
 type ArrayOfNumberOnly struct {
 	ArrayNumber *[]float32 `json:"ArrayNumber,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _ArrayOfNumberOnly 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
@@ -72,9 +75,31 @@ func (o ArrayOfNumberOnly) MarshalJSON() ([]byte, error) {
 	if o.ArrayNumber != nil {
 		toSerialize["ArrayNumber"] = o.ArrayNumber
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *ArrayOfNumberOnly) UnmarshalJSON(bytes []byte) (err error) {
+	varArrayOfNumberOnly := _ArrayOfNumberOnly{}
+
+	if err = json.Unmarshal(bytes, &varArrayOfNumberOnly); err == nil {
+		*o = ArrayOfNumberOnly(varArrayOfNumberOnly)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "ArrayNumber")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableArrayOfNumberOnly struct {
 	value *ArrayOfNumberOnly
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_array_test_.go

@@ -18,8 +18,11 @@ type ArrayTest struct {
 	ArrayOfString *[]string `json:"array_of_string,omitempty"`
 	ArrayArrayOfInteger *[][]int64 `json:"array_array_of_integer,omitempty"`
 	ArrayArrayOfModel *[][]ReadOnlyFirst `json:"array_array_of_model,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _ArrayTest 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
@@ -144,9 +147,33 @@ func (o ArrayTest) MarshalJSON() ([]byte, error) {
 	if o.ArrayArrayOfModel != nil {
 		toSerialize["array_array_of_model"] = o.ArrayArrayOfModel
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *ArrayTest) UnmarshalJSON(bytes []byte) (err error) {
+	varArrayTest := _ArrayTest{}
+
+	if err = json.Unmarshal(bytes, &varArrayTest); err == nil {
+		*o = ArrayTest(varArrayTest)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "array_of_string")
+		delete(additionalProperties, "array_array_of_integer")
+		delete(additionalProperties, "array_array_of_model")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableArrayTest struct {
 	value *ArrayTest
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_banana_req.go

@@ -17,8 +17,11 @@ import (
 type BananaReq struct {
 	LengthCm float32 `json:"lengthCm"`
 	Sweet *bool `json:"sweet,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _BananaReq BananaReq
+
 // NewBananaReq instantiates a new BananaReq 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
@@ -101,9 +104,32 @@ func (o BananaReq) MarshalJSON() ([]byte, error) {
 	if o.Sweet != nil {
 		toSerialize["sweet"] = o.Sweet
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *BananaReq) UnmarshalJSON(bytes []byte) (err error) {
+	varBananaReq := _BananaReq{}
+
+	if err = json.Unmarshal(bytes, &varBananaReq); err == nil {
+		*o = BananaReq(varBananaReq)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "lengthCm")
+		delete(additionalProperties, "sweet")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableBananaReq struct {
 	value *BananaReq
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_capitalization.go

@@ -22,8 +22,11 @@ type Capitalization struct {
 	SCAETHFlowPoints *string `json:"SCA_ETH_Flow_Points,omitempty"`
 	// Name of the pet 
 	ATT_NAME *string `json:"ATT_NAME,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Capitalization 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
@@ -253,9 +256,36 @@ func (o Capitalization) MarshalJSON() ([]byte, error) {
 	if o.ATT_NAME != nil {
 		toSerialize["ATT_NAME"] = o.ATT_NAME
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Capitalization) UnmarshalJSON(bytes []byte) (err error) {
+	varCapitalization := _Capitalization{}
+
+	if err = json.Unmarshal(bytes, &varCapitalization); err == nil {
+		*o = Capitalization(varCapitalization)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "smallCamel")
+		delete(additionalProperties, "CapitalCamel")
+		delete(additionalProperties, "small_Snake")
+		delete(additionalProperties, "Capital_Snake")
+		delete(additionalProperties, "SCA_ETH_Flow_Points")
+		delete(additionalProperties, "ATT_NAME")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableCapitalization struct {
 	value *Capitalization
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_cat.go

@@ -11,14 +11,19 @@ package petstore
 
 import (
 	"encoding/json"
+	"reflect"
+	"strings"
 )
 
 // Cat struct for Cat
 type Cat struct {
 	Animal
 	Declawed *bool `json:"declawed,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Cat 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
@@ -81,9 +86,68 @@ func (o Cat) MarshalJSON() ([]byte, error) {
 	if o.Declawed != nil {
 		toSerialize["declawed"] = o.Declawed
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Cat) UnmarshalJSON(bytes []byte) (err error) {
+	type CatWithoutEmbeddedStruct struct {
+		Declawed *bool `json:"declawed,omitempty"`
+	}
+
+	varCatWithoutEmbeddedStruct := CatWithoutEmbeddedStruct{}
+
+	err = json.Unmarshal(bytes, &varCatWithoutEmbeddedStruct)
+	if err == nil {
+		varCat := _Cat{}
+		varCat.Declawed = varCatWithoutEmbeddedStruct.Declawed
+		*o = Cat(varCat)
+	} else {
+		return err
+	}
+
+	varCat := _Cat{}
+
+	err = json.Unmarshal(bytes, &varCat)
+	if err == nil {
+		o.Animal = varCat.Animal
+	} else {
+		return err
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "declawed")
+
+		// remove fields from embedded structs
+		reflectAnimal := reflect.ValueOf(o.Animal)
+		for i := 0; i < reflectAnimal.Type().NumField(); i++ {
+			t := reflectAnimal.Type().Field(i)
+
+			if jsonTag := t.Tag.Get("json"); jsonTag != "" {
+				fieldName := ""
+				if commaIdx := strings.Index(jsonTag, ","); commaIdx > 0 {
+					fieldName = jsonTag[:commaIdx]
+				} else {
+					fieldName = jsonTag
+				}
+				if fieldName != "AdditionalProperties" {
+					delete(additionalProperties, fieldName)
+				}
+			}
+		}
+
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableCat struct {
 	value *Cat
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_cat_all_of.go

@@ -16,8 +16,11 @@ import (
 // CatAllOf struct for CatAllOf
 type CatAllOf struct {
 	Declawed *bool `json:"declawed,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _CatAllOf 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
@@ -72,9 +75,31 @@ func (o CatAllOf) MarshalJSON() ([]byte, error) {
 	if o.Declawed != nil {
 		toSerialize["declawed"] = o.Declawed
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *CatAllOf) UnmarshalJSON(bytes []byte) (err error) {
+	varCatAllOf := _CatAllOf{}
+
+	if err = json.Unmarshal(bytes, &varCatAllOf); err == nil {
+		*o = CatAllOf(varCatAllOf)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "declawed")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableCatAllOf struct {
 	value *CatAllOf
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_category.go

@@ -17,8 +17,11 @@ import (
 type Category struct {
 	Id *int64 `json:"id,omitempty"`
 	Name string `json:"name"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Category 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
@@ -103,9 +106,32 @@ func (o Category) MarshalJSON() ([]byte, error) {
 	if true {
 		toSerialize["name"] = o.Name
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Category) UnmarshalJSON(bytes []byte) (err error) {
+	varCategory := _Category{}
+
+	if err = json.Unmarshal(bytes, &varCategory); err == nil {
+		*o = Category(varCategory)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "id")
+		delete(additionalProperties, "name")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableCategory struct {
 	value *Category
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_class_model.go

@@ -16,8 +16,11 @@ import (
 // ClassModel Model for testing model with \"_class\" property
 type ClassModel struct {
 	Class *string `json:"_class,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _ClassModel 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
@@ -72,9 +75,31 @@ func (o ClassModel) MarshalJSON() ([]byte, error) {
 	if o.Class != nil {
 		toSerialize["_class"] = o.Class
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *ClassModel) UnmarshalJSON(bytes []byte) (err error) {
+	varClassModel := _ClassModel{}
+
+	if err = json.Unmarshal(bytes, &varClassModel); err == nil {
+		*o = ClassModel(varClassModel)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "_class")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableClassModel struct {
 	value *ClassModel
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_client.go

@@ -16,8 +16,11 @@ import (
 // Client struct for Client
 type Client struct {
 	Client *string `json:"client,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Client 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
@@ -72,9 +75,31 @@ func (o Client) MarshalJSON() ([]byte, error) {
 	if o.Client != nil {
 		toSerialize["client"] = o.Client
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Client) UnmarshalJSON(bytes []byte) (err error) {
+	varClient := _Client{}
+
+	if err = json.Unmarshal(bytes, &varClient); err == nil {
+		*o = Client(varClient)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "client")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableClient struct {
 	value *Client
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_dog.go

@@ -11,14 +11,19 @@ package petstore
 
 import (
 	"encoding/json"
+	"reflect"
+	"strings"
 )
 
 // Dog struct for Dog
 type Dog struct {
 	Animal
 	Breed *string `json:"breed,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Dog 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
@@ -81,9 +86,68 @@ func (o Dog) MarshalJSON() ([]byte, error) {
 	if o.Breed != nil {
 		toSerialize["breed"] = o.Breed
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Dog) UnmarshalJSON(bytes []byte) (err error) {
+	type DogWithoutEmbeddedStruct struct {
+		Breed *string `json:"breed,omitempty"`
+	}
+
+	varDogWithoutEmbeddedStruct := DogWithoutEmbeddedStruct{}
+
+	err = json.Unmarshal(bytes, &varDogWithoutEmbeddedStruct)
+	if err == nil {
+		varDog := _Dog{}
+		varDog.Breed = varDogWithoutEmbeddedStruct.Breed
+		*o = Dog(varDog)
+	} else {
+		return err
+	}
+
+	varDog := _Dog{}
+
+	err = json.Unmarshal(bytes, &varDog)
+	if err == nil {
+		o.Animal = varDog.Animal
+	} else {
+		return err
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "breed")
+
+		// remove fields from embedded structs
+		reflectAnimal := reflect.ValueOf(o.Animal)
+		for i := 0; i < reflectAnimal.Type().NumField(); i++ {
+			t := reflectAnimal.Type().Field(i)
+
+			if jsonTag := t.Tag.Get("json"); jsonTag != "" {
+				fieldName := ""
+				if commaIdx := strings.Index(jsonTag, ","); commaIdx > 0 {
+					fieldName = jsonTag[:commaIdx]
+				} else {
+					fieldName = jsonTag
+				}
+				if fieldName != "AdditionalProperties" {
+					delete(additionalProperties, fieldName)
+				}
+			}
+		}
+
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableDog struct {
 	value *Dog
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_dog_all_of.go

@@ -16,8 +16,11 @@ import (
 // DogAllOf struct for DogAllOf
 type DogAllOf struct {
 	Breed *string `json:"breed,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _DogAllOf 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
@@ -72,9 +75,31 @@ func (o DogAllOf) MarshalJSON() ([]byte, error) {
 	if o.Breed != nil {
 		toSerialize["breed"] = o.Breed
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *DogAllOf) UnmarshalJSON(bytes []byte) (err error) {
+	varDogAllOf := _DogAllOf{}
+
+	if err = json.Unmarshal(bytes, &varDogAllOf); err == nil {
+		*o = DogAllOf(varDogAllOf)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "breed")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableDogAllOf struct {
 	value *DogAllOf
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_enum_arrays.go

@@ -17,8 +17,11 @@ import (
 type EnumArrays struct {
 	JustSymbol *string `json:"just_symbol,omitempty"`
 	ArrayEnum *[]string `json:"array_enum,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _EnumArrays 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
@@ -108,9 +111,32 @@ func (o EnumArrays) MarshalJSON() ([]byte, error) {
 	if o.ArrayEnum != nil {
 		toSerialize["array_enum"] = o.ArrayEnum
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *EnumArrays) UnmarshalJSON(bytes []byte) (err error) {
+	varEnumArrays := _EnumArrays{}
+
+	if err = json.Unmarshal(bytes, &varEnumArrays); err == nil {
+		*o = EnumArrays(varEnumArrays)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "just_symbol")
+		delete(additionalProperties, "array_enum")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableEnumArrays struct {
 	value *EnumArrays
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_enum_test_.go

@@ -23,8 +23,11 @@ type EnumTest struct {
 	OuterEnumInteger *OuterEnumInteger `json:"outerEnumInteger,omitempty"`
 	OuterEnumDefaultValue *OuterEnumDefaultValue `json:"outerEnumDefaultValue,omitempty"`
 	OuterEnumIntegerDefaultValue *OuterEnumIntegerDefaultValue `json:"outerEnumIntegerDefaultValue,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _EnumTest 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
@@ -335,9 +338,38 @@ func (o EnumTest) MarshalJSON() ([]byte, error) {
 	if o.OuterEnumIntegerDefaultValue != nil {
 		toSerialize["outerEnumIntegerDefaultValue"] = o.OuterEnumIntegerDefaultValue
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *EnumTest) UnmarshalJSON(bytes []byte) (err error) {
+	varEnumTest := _EnumTest{}
+
+	if err = json.Unmarshal(bytes, &varEnumTest); err == nil {
+		*o = EnumTest(varEnumTest)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "enum_string")
+		delete(additionalProperties, "enum_string_required")
+		delete(additionalProperties, "enum_integer")
+		delete(additionalProperties, "enum_number")
+		delete(additionalProperties, "outerEnum")
+		delete(additionalProperties, "outerEnumInteger")
+		delete(additionalProperties, "outerEnumDefaultValue")
+		delete(additionalProperties, "outerEnumIntegerDefaultValue")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableEnumTest struct {
 	value *EnumTest
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_file.go

@@ -17,8 +17,11 @@ import (
 type File struct {
 	// Test capitalization
 	SourceURI *string `json:"sourceURI,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _File 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
@@ -73,9 +76,31 @@ func (o File) MarshalJSON() ([]byte, error) {
 	if o.SourceURI != nil {
 		toSerialize["sourceURI"] = o.SourceURI
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *File) UnmarshalJSON(bytes []byte) (err error) {
+	varFile := _File{}
+
+	if err = json.Unmarshal(bytes, &varFile); err == nil {
+		*o = File(varFile)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "sourceURI")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableFile struct {
 	value *File
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_file_schema_test_class.go

@@ -17,8 +17,11 @@ import (
 type FileSchemaTestClass struct {
 	File *File `json:"file,omitempty"`
 	Files *[]File `json:"files,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _FileSchemaTestClass 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
@@ -108,9 +111,32 @@ func (o FileSchemaTestClass) MarshalJSON() ([]byte, error) {
 	if o.Files != nil {
 		toSerialize["files"] = o.Files
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *FileSchemaTestClass) UnmarshalJSON(bytes []byte) (err error) {
+	varFileSchemaTestClass := _FileSchemaTestClass{}
+
+	if err = json.Unmarshal(bytes, &varFileSchemaTestClass); err == nil {
+		*o = FileSchemaTestClass(varFileSchemaTestClass)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "file")
+		delete(additionalProperties, "files")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableFileSchemaTestClass struct {
 	value *FileSchemaTestClass
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_foo.go

@@ -16,8 +16,11 @@ import (
 // Foo struct for Foo
 type Foo struct {
 	Bar *string `json:"bar,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Foo 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
@@ -76,9 +79,31 @@ func (o Foo) MarshalJSON() ([]byte, error) {
 	if o.Bar != nil {
 		toSerialize["bar"] = o.Bar
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Foo) UnmarshalJSON(bytes []byte) (err error) {
+	varFoo := _Foo{}
+
+	if err = json.Unmarshal(bytes, &varFoo); err == nil {
+		*o = Foo(varFoo)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "bar")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableFoo struct {
 	value *Foo
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_format_test_.go

@@ -34,8 +34,11 @@ type FormatTest struct {
 	PatternWithDigits *string `json:"pattern_with_digits,omitempty"`
 	// A string starting with 'image_' (case insensitive) and one to three digits following i.e. Image_01.
 	PatternWithDigitsAndDelimiter *string `json:"pattern_with_digits_and_delimiter,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _FormatTest 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
@@ -552,9 +555,45 @@ func (o FormatTest) MarshalJSON() ([]byte, error) {
 	if o.PatternWithDigitsAndDelimiter != nil {
 		toSerialize["pattern_with_digits_and_delimiter"] = o.PatternWithDigitsAndDelimiter
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *FormatTest) UnmarshalJSON(bytes []byte) (err error) {
+	varFormatTest := _FormatTest{}
+
+	if err = json.Unmarshal(bytes, &varFormatTest); err == nil {
+		*o = FormatTest(varFormatTest)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "integer")
+		delete(additionalProperties, "int32")
+		delete(additionalProperties, "int64")
+		delete(additionalProperties, "number")
+		delete(additionalProperties, "float")
+		delete(additionalProperties, "double")
+		delete(additionalProperties, "string")
+		delete(additionalProperties, "byte")
+		delete(additionalProperties, "binary")
+		delete(additionalProperties, "date")
+		delete(additionalProperties, "dateTime")
+		delete(additionalProperties, "uuid")
+		delete(additionalProperties, "password")
+		delete(additionalProperties, "pattern_with_digits")
+		delete(additionalProperties, "pattern_with_digits_and_delimiter")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableFormatTest struct {
 	value *FormatTest
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_has_only_read_only.go

@@ -17,8 +17,11 @@ import (
 type HasOnlyReadOnly struct {
 	Bar *string `json:"bar,omitempty"`
 	Foo *string `json:"foo,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _HasOnlyReadOnly 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
@@ -108,9 +111,32 @@ func (o HasOnlyReadOnly) MarshalJSON() ([]byte, error) {
 	if o.Foo != nil {
 		toSerialize["foo"] = o.Foo
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *HasOnlyReadOnly) UnmarshalJSON(bytes []byte) (err error) {
+	varHasOnlyReadOnly := _HasOnlyReadOnly{}
+
+	if err = json.Unmarshal(bytes, &varHasOnlyReadOnly); err == nil {
+		*o = HasOnlyReadOnly(varHasOnlyReadOnly)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "bar")
+		delete(additionalProperties, "foo")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableHasOnlyReadOnly struct {
 	value *HasOnlyReadOnly
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_health_check_result.go

@@ -16,8 +16,11 @@ import (
 // HealthCheckResult Just a string to inform instance is up and running. Make it nullable in hope to get it as pointer in generated model.
 type HealthCheckResult struct {
 	NullableMessage NullableString `json:"NullableMessage,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _HealthCheckResult 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
@@ -82,9 +85,31 @@ func (o HealthCheckResult) MarshalJSON() ([]byte, error) {
 	if o.NullableMessage.IsSet() {
 		toSerialize["NullableMessage"] = o.NullableMessage.Get()
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *HealthCheckResult) UnmarshalJSON(bytes []byte) (err error) {
+	varHealthCheckResult := _HealthCheckResult{}
+
+	if err = json.Unmarshal(bytes, &varHealthCheckResult); err == nil {
+		*o = HealthCheckResult(varHealthCheckResult)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "NullableMessage")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableHealthCheckResult struct {
 	value *HealthCheckResult
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object.go

@@ -19,8 +19,11 @@ type InlineObject struct {
 	Name *string `json:"name,omitempty"`
 	// Updated status of the pet
 	Status *string `json:"status,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _InlineObject 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
@@ -110,9 +113,32 @@ func (o InlineObject) MarshalJSON() ([]byte, error) {
 	if o.Status != nil {
 		toSerialize["status"] = o.Status
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *InlineObject) UnmarshalJSON(bytes []byte) (err error) {
+	varInlineObject := _InlineObject{}
+
+	if err = json.Unmarshal(bytes, &varInlineObject); err == nil {
+		*o = InlineObject(varInlineObject)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "name")
+		delete(additionalProperties, "status")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableInlineObject struct {
 	value *InlineObject
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_1.go

@@ -20,8 +20,11 @@ type InlineObject1 struct {
 	AdditionalMetadata *string `json:"additionalMetadata,omitempty"`
 	// file to upload
 	File **os.File `json:"file,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _InlineObject1 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
@@ -111,9 +114,32 @@ func (o InlineObject1) MarshalJSON() ([]byte, error) {
 	if o.File != nil {
 		toSerialize["file"] = o.File
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *InlineObject1) UnmarshalJSON(bytes []byte) (err error) {
+	varInlineObject1 := _InlineObject1{}
+
+	if err = json.Unmarshal(bytes, &varInlineObject1); err == nil {
+		*o = InlineObject1(varInlineObject1)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "additionalMetadata")
+		delete(additionalProperties, "file")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableInlineObject1 struct {
 	value *InlineObject1
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_2.go

@@ -19,8 +19,11 @@ type InlineObject2 struct {
 	EnumFormStringArray *[]string `json:"enum_form_string_array,omitempty"`
 	// Form parameter enum test (string)
 	EnumFormString *string `json:"enum_form_string,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _InlineObject2 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
@@ -114,9 +117,32 @@ func (o InlineObject2) MarshalJSON() ([]byte, error) {
 	if o.EnumFormString != nil {
 		toSerialize["enum_form_string"] = o.EnumFormString
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *InlineObject2) UnmarshalJSON(bytes []byte) (err error) {
+	varInlineObject2 := _InlineObject2{}
+
+	if err = json.Unmarshal(bytes, &varInlineObject2); err == nil {
+		*o = InlineObject2(varInlineObject2)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "enum_form_string_array")
+		delete(additionalProperties, "enum_form_string")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableInlineObject2 struct {
 	value *InlineObject2
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_3.go

@@ -45,8 +45,11 @@ type InlineObject3 struct {
 	Password *string `json:"password,omitempty"`
 	// None
 	Callback *string `json:"callback,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _InlineObject3 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
@@ -528,9 +531,44 @@ func (o InlineObject3) MarshalJSON() ([]byte, error) {
 	if o.Callback != nil {
 		toSerialize["callback"] = o.Callback
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *InlineObject3) UnmarshalJSON(bytes []byte) (err error) {
+	varInlineObject3 := _InlineObject3{}
+
+	if err = json.Unmarshal(bytes, &varInlineObject3); err == nil {
+		*o = InlineObject3(varInlineObject3)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "integer")
+		delete(additionalProperties, "int32")
+		delete(additionalProperties, "int64")
+		delete(additionalProperties, "number")
+		delete(additionalProperties, "float")
+		delete(additionalProperties, "double")
+		delete(additionalProperties, "string")
+		delete(additionalProperties, "pattern_without_delimiter")
+		delete(additionalProperties, "byte")
+		delete(additionalProperties, "binary")
+		delete(additionalProperties, "date")
+		delete(additionalProperties, "dateTime")
+		delete(additionalProperties, "password")
+		delete(additionalProperties, "callback")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableInlineObject3 struct {
 	value *InlineObject3
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_4.go

@@ -19,8 +19,11 @@ type InlineObject4 struct {
 	Param string `json:"param"`
 	// field2
 	Param2 string `json:"param2"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _InlineObject4 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
@@ -96,9 +99,32 @@ func (o InlineObject4) MarshalJSON() ([]byte, error) {
 	if true {
 		toSerialize["param2"] = o.Param2
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *InlineObject4) UnmarshalJSON(bytes []byte) (err error) {
+	varInlineObject4 := _InlineObject4{}
+
+	if err = json.Unmarshal(bytes, &varInlineObject4); err == nil {
+		*o = InlineObject4(varInlineObject4)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "param")
+		delete(additionalProperties, "param2")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableInlineObject4 struct {
 	value *InlineObject4
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_object_5.go

@@ -20,8 +20,11 @@ type InlineObject5 struct {
 	AdditionalMetadata *string `json:"additionalMetadata,omitempty"`
 	// file to upload
 	RequiredFile *os.File `json:"requiredFile"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _InlineObject5 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
@@ -104,9 +107,32 @@ func (o InlineObject5) MarshalJSON() ([]byte, error) {
 	if true {
 		toSerialize["requiredFile"] = o.RequiredFile
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *InlineObject5) UnmarshalJSON(bytes []byte) (err error) {
+	varInlineObject5 := _InlineObject5{}
+
+	if err = json.Unmarshal(bytes, &varInlineObject5); err == nil {
+		*o = InlineObject5(varInlineObject5)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "additionalMetadata")
+		delete(additionalProperties, "requiredFile")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableInlineObject5 struct {
 	value *InlineObject5
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_inline_response_default.go

@@ -16,8 +16,11 @@ import (
 // InlineResponseDefault struct for InlineResponseDefault
 type InlineResponseDefault struct {
 	String *Foo `json:"string,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _InlineResponseDefault 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
@@ -72,9 +75,31 @@ func (o InlineResponseDefault) MarshalJSON() ([]byte, error) {
 	if o.String != nil {
 		toSerialize["string"] = o.String
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *InlineResponseDefault) UnmarshalJSON(bytes []byte) (err error) {
+	varInlineResponseDefault := _InlineResponseDefault{}
+
+	if err = json.Unmarshal(bytes, &varInlineResponseDefault); err == nil {
+		*o = InlineResponseDefault(varInlineResponseDefault)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "string")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableInlineResponseDefault struct {
 	value *InlineResponseDefault
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_list.go

@@ -16,8 +16,11 @@ import (
 // List struct for List
 type List struct {
 	Var123List *string `json:"123-list,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _List 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
@@ -72,9 +75,31 @@ func (o List) MarshalJSON() ([]byte, error) {
 	if o.Var123List != nil {
 		toSerialize["123-list"] = o.Var123List
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *List) UnmarshalJSON(bytes []byte) (err error) {
+	varList := _List{}
+
+	if err = json.Unmarshal(bytes, &varList); err == nil {
+		*o = List(varList)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "123-list")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableList struct {
 	value *List
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_map_test_.go

@@ -19,8 +19,11 @@ type MapTest struct {
 	MapOfEnumString *map[string]string `json:"map_of_enum_string,omitempty"`
 	DirectMap *map[string]bool `json:"direct_map,omitempty"`
 	IndirectMap *map[string]bool `json:"indirect_map,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _MapTest 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
@@ -180,9 +183,34 @@ func (o MapTest) MarshalJSON() ([]byte, error) {
 	if o.IndirectMap != nil {
 		toSerialize["indirect_map"] = o.IndirectMap
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *MapTest) UnmarshalJSON(bytes []byte) (err error) {
+	varMapTest := _MapTest{}
+
+	if err = json.Unmarshal(bytes, &varMapTest); err == nil {
+		*o = MapTest(varMapTest)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "map_map_of_string")
+		delete(additionalProperties, "map_of_enum_string")
+		delete(additionalProperties, "direct_map")
+		delete(additionalProperties, "indirect_map")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableMapTest struct {
 	value *MapTest
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_mixed_properties_and_additional_properties_class.go

@@ -19,8 +19,11 @@ type MixedPropertiesAndAdditionalPropertiesClass struct {
 	Uuid *string `json:"uuid,omitempty"`
 	DateTime *time.Time `json:"dateTime,omitempty"`
 	Map *map[string]Animal `json:"map,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _MixedPropertiesAndAdditionalPropertiesClass 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
@@ -145,9 +148,33 @@ func (o MixedPropertiesAndAdditionalPropertiesClass) MarshalJSON() ([]byte, erro
 	if o.Map != nil {
 		toSerialize["map"] = o.Map
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *MixedPropertiesAndAdditionalPropertiesClass) UnmarshalJSON(bytes []byte) (err error) {
+	varMixedPropertiesAndAdditionalPropertiesClass := _MixedPropertiesAndAdditionalPropertiesClass{}
+
+	if err = json.Unmarshal(bytes, &varMixedPropertiesAndAdditionalPropertiesClass); err == nil {
+		*o = MixedPropertiesAndAdditionalPropertiesClass(varMixedPropertiesAndAdditionalPropertiesClass)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "uuid")
+		delete(additionalProperties, "dateTime")
+		delete(additionalProperties, "map")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableMixedPropertiesAndAdditionalPropertiesClass struct {
 	value *MixedPropertiesAndAdditionalPropertiesClass
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_name.go

@@ -19,8 +19,11 @@ type Name struct {
 	SnakeCase *int32 `json:"snake_case,omitempty"`
 	Property *string `json:"property,omitempty"`
 	Var123Number *int32 `json:"123Number,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Name 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
@@ -173,9 +176,34 @@ func (o Name) MarshalJSON() ([]byte, error) {
 	if o.Var123Number != nil {
 		toSerialize["123Number"] = o.Var123Number
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Name) UnmarshalJSON(bytes []byte) (err error) {
+	varName := _Name{}
+
+	if err = json.Unmarshal(bytes, &varName); err == nil {
+		*o = Name(varName)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "name")
+		delete(additionalProperties, "snake_case")
+		delete(additionalProperties, "property")
+		delete(additionalProperties, "123Number")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableName struct {
 	value *Name
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_number_only.go

@@ -16,8 +16,11 @@ import (
 // NumberOnly struct for NumberOnly
 type NumberOnly struct {
 	JustNumber *float32 `json:"JustNumber,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _NumberOnly 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
@@ -72,9 +75,31 @@ func (o NumberOnly) MarshalJSON() ([]byte, error) {
 	if o.JustNumber != nil {
 		toSerialize["JustNumber"] = o.JustNumber
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *NumberOnly) UnmarshalJSON(bytes []byte) (err error) {
+	varNumberOnly := _NumberOnly{}
+
+	if err = json.Unmarshal(bytes, &varNumberOnly); err == nil {
+		*o = NumberOnly(varNumberOnly)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "JustNumber")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableNumberOnly struct {
 	value *NumberOnly
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_order.go

@@ -23,8 +23,11 @@ type Order struct {
 	// Order Status
 	Status *string `json:"status,omitempty"`
 	Complete *bool `json:"complete,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Order 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
@@ -258,9 +261,36 @@ func (o Order) MarshalJSON() ([]byte, error) {
 	if o.Complete != nil {
 		toSerialize["complete"] = o.Complete
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Order) UnmarshalJSON(bytes []byte) (err error) {
+	varOrder := _Order{}
+
+	if err = json.Unmarshal(bytes, &varOrder); err == nil {
+		*o = Order(varOrder)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "id")
+		delete(additionalProperties, "petId")
+		delete(additionalProperties, "quantity")
+		delete(additionalProperties, "shipDate")
+		delete(additionalProperties, "status")
+		delete(additionalProperties, "complete")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableOrder struct {
 	value *Order
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_outer_composite.go

@@ -18,8 +18,11 @@ type OuterComposite struct {
 	MyNumber *float32 `json:"my_number,omitempty"`
 	MyString *string `json:"my_string,omitempty"`
 	MyBoolean *bool `json:"my_boolean,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _OuterComposite 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
@@ -144,9 +147,33 @@ func (o OuterComposite) MarshalJSON() ([]byte, error) {
 	if o.MyBoolean != nil {
 		toSerialize["my_boolean"] = o.MyBoolean
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *OuterComposite) UnmarshalJSON(bytes []byte) (err error) {
+	varOuterComposite := _OuterComposite{}
+
+	if err = json.Unmarshal(bytes, &varOuterComposite); err == nil {
+		*o = OuterComposite(varOuterComposite)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "my_number")
+		delete(additionalProperties, "my_string")
+		delete(additionalProperties, "my_boolean")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableOuterComposite struct {
 	value *OuterComposite
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_pet.go

@@ -22,8 +22,11 @@ type Pet struct {
 	Tags *[]Tag `json:"tags,omitempty"`
 	// pet status in the store
 	Status *string `json:"status,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Pet 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
@@ -239,9 +242,36 @@ func (o Pet) MarshalJSON() ([]byte, error) {
 	if o.Status != nil {
 		toSerialize["status"] = o.Status
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Pet) UnmarshalJSON(bytes []byte) (err error) {
+	varPet := _Pet{}
+
+	if err = json.Unmarshal(bytes, &varPet); err == nil {
+		*o = Pet(varPet)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "id")
+		delete(additionalProperties, "category")
+		delete(additionalProperties, "name")
+		delete(additionalProperties, "photoUrls")
+		delete(additionalProperties, "tags")
+		delete(additionalProperties, "status")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullablePet struct {
 	value *Pet
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_read_only_first.go

@@ -17,8 +17,11 @@ import (
 type ReadOnlyFirst struct {
 	Bar *string `json:"bar,omitempty"`
 	Baz *string `json:"baz,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _ReadOnlyFirst 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
@@ -108,9 +111,32 @@ func (o ReadOnlyFirst) MarshalJSON() ([]byte, error) {
 	if o.Baz != nil {
 		toSerialize["baz"] = o.Baz
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *ReadOnlyFirst) UnmarshalJSON(bytes []byte) (err error) {
+	varReadOnlyFirst := _ReadOnlyFirst{}
+
+	if err = json.Unmarshal(bytes, &varReadOnlyFirst); err == nil {
+		*o = ReadOnlyFirst(varReadOnlyFirst)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "bar")
+		delete(additionalProperties, "baz")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableReadOnlyFirst struct {
 	value *ReadOnlyFirst
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_return.go

@@ -16,8 +16,11 @@ import (
 // Return Model for testing reserved words
 type Return struct {
 	Return *int32 `json:"return,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Return 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
@@ -72,9 +75,31 @@ func (o Return) MarshalJSON() ([]byte, error) {
 	if o.Return != nil {
 		toSerialize["return"] = o.Return
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Return) UnmarshalJSON(bytes []byte) (err error) {
+	varReturn := _Return{}
+
+	if err = json.Unmarshal(bytes, &varReturn); err == nil {
+		*o = Return(varReturn)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "return")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableReturn struct {
 	value *Return
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_tag.go

@@ -17,8 +17,11 @@ import (
 type Tag struct {
 	Id *int64 `json:"id,omitempty"`
 	Name *string `json:"name,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Tag 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
@@ -108,9 +111,32 @@ func (o Tag) MarshalJSON() ([]byte, error) {
 	if o.Name != nil {
 		toSerialize["name"] = o.Name
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Tag) UnmarshalJSON(bytes []byte) (err error) {
+	varTag := _Tag{}
+
+	if err = json.Unmarshal(bytes, &varTag); err == nil {
+		*o = Tag(varTag)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "id")
+		delete(additionalProperties, "name")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableTag struct {
 	value *Tag
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_user.go

@@ -32,8 +32,11 @@ type User struct {
 	ArbitraryTypeValue interface{} `json:"arbitraryTypeValue,omitempty"`
 	// test code generation for any type Value can be any type - string, number, boolean, array, object or the 'null' value.
 	ArbitraryNullableTypeValue interface{} `json:"arbitraryNullableTypeValue,omitempty"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _User 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
@@ -476,9 +479,42 @@ func (o User) MarshalJSON() ([]byte, error) {
 	if o.ArbitraryNullableTypeValue != nil {
 		toSerialize["arbitraryNullableTypeValue"] = o.ArbitraryNullableTypeValue
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *User) UnmarshalJSON(bytes []byte) (err error) {
+	varUser := _User{}
+
+	if err = json.Unmarshal(bytes, &varUser); err == nil {
+		*o = User(varUser)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "id")
+		delete(additionalProperties, "username")
+		delete(additionalProperties, "firstName")
+		delete(additionalProperties, "lastName")
+		delete(additionalProperties, "email")
+		delete(additionalProperties, "password")
+		delete(additionalProperties, "phone")
+		delete(additionalProperties, "userStatus")
+		delete(additionalProperties, "arbitraryObject")
+		delete(additionalProperties, "arbitraryNullableObject")
+		delete(additionalProperties, "arbitraryTypeValue")
+		delete(additionalProperties, "arbitraryNullableTypeValue")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableUser struct {
 	value *User
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_whale.go

@@ -18,8 +18,11 @@ type Whale struct {
 	HasBaleen *bool `json:"hasBaleen,omitempty"`
 	HasTeeth *bool `json:"hasTeeth,omitempty"`
 	ClassName string `json:"className"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Whale Whale
+
 // NewWhale instantiates a new Whale 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
@@ -137,9 +140,33 @@ func (o Whale) MarshalJSON() ([]byte, error) {
 	if true {
 		toSerialize["className"] = o.ClassName
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Whale) UnmarshalJSON(bytes []byte) (err error) {
+	varWhale := _Whale{}
+
+	if err = json.Unmarshal(bytes, &varWhale); err == nil {
+		*o = Whale(varWhale)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "hasBaleen")
+		delete(additionalProperties, "hasTeeth")
+		delete(additionalProperties, "className")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableWhale struct {
 	value *Whale
 	isSet bool

samples/openapi3/client/petstore/go-experimental/go-petstore/model_zebra.go

@@ -17,8 +17,11 @@ import (
 type Zebra struct {
 	Type *string `json:"type,omitempty"`
 	ClassName string `json:"className"`
+	AdditionalProperties map[string]interface{}
 }
 
+type _Zebra Zebra
+
 // NewZebra instantiates a new Zebra 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
@@ -101,9 +104,32 @@ func (o Zebra) MarshalJSON() ([]byte, error) {
 	if true {
 		toSerialize["className"] = o.ClassName
 	}
+
+	for key, value := range o.AdditionalProperties {
+		toSerialize[key] = value
+	}
+
 	return json.Marshal(toSerialize)
 }
 
+func (o *Zebra) UnmarshalJSON(bytes []byte) (err error) {
+	varZebra := _Zebra{}
+
+	if err = json.Unmarshal(bytes, &varZebra); err == nil {
+		*o = Zebra(varZebra)
+	}
+
+	additionalProperties := make(map[string]interface{})
+
+	if err = json.Unmarshal(bytes, &additionalProperties); err == nil {
+		delete(additionalProperties, "type")
+		delete(additionalProperties, "className")
+		o.AdditionalProperties = additionalProperties
+	}
+
+	return err
+}
+
 type NullableZebra struct {
 	value *Zebra
 	isSet bool

samples/openapi3/client/petstore/go-experimental/model_test.go

@@ -1,34 +1,43 @@
 package main
 
 import (
+	"encoding/json"
 	"testing"
-    "encoding/json"
-	"github.com/stretchr/testify/assert"
+
 	sw "./go-petstore"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestBanana(t *testing.T) {
-    assert := assert.New(t)
+	assert := assert.New(t)
 
-    lengthCm := float32(2.3)
-    lengthCm2 := float32(2.4)
-    newBanana := (sw.Banana{LengthCm: &lengthCm})
-    newBanana.LengthCm = &lengthCm2
-    assert.Equal(newBanana.LengthCm, &lengthCm2, "Banana LengthCm should be equal")
+	lengthCm := float32(2.3)
+	lengthCm2 := float32(2.4)
+	newBanana := (sw.Banana{LengthCm: &lengthCm})
+	newBanana.LengthCm = &lengthCm2
+	assert.Equal(newBanana.LengthCm, &lengthCm2, "Banana LengthCm should be equal")
 
-    // test additioanl properties
-    jsonBanana:= `{"fruits":["apple","peach"],"lengthCm":3.1}`
-    jsonMap := make(map[string]interface{})
-    json.Unmarshal([]byte(jsonBanana), &jsonMap)
+	// test additioanl properties
+	jsonBanana := `{"fruits":["apple","peach"],"lengthCm":3.1}`
+	jsonMap := make(map[string]interface{})
+	json.Unmarshal([]byte(jsonBanana), &jsonMap)
 
-    newBanana2 := (sw.Banana{})
-    lengthCm3 := float32(3.1)
-    json.Unmarshal([]byte(jsonBanana), &newBanana2)
-    assert.Equal(newBanana2.LengthCm, &lengthCm3, "Banana2 LengthCm should be equal")
-    assert.Equal(newBanana2.AdditionalProperties["fruits"], jsonMap["fruits"], "Banana2 AdditonalProperties should be equal")
-
-    newBanana2Json, _ := json.Marshal(newBanana2)
-    assert.Equal(string(newBanana2Json), jsonBanana, "Banana2 JSON string should be equal")
+	newBanana2 := (sw.Banana{})
+	lengthCm3 := float32(3.1)
+	json.Unmarshal([]byte(jsonBanana), &newBanana2)
+	assert.Equal(newBanana2.LengthCm, &lengthCm3, "Banana2 LengthCm should be equal")
+	assert.Equal(newBanana2.AdditionalProperties["fruits"], jsonMap["fruits"], "Banana2 AdditonalProperties should be equal")
 
+	newBanana2Json, _ := json.Marshal(newBanana2)
+	assert.Equal(string(newBanana2Json), jsonBanana, "Banana2 JSON string should be equal")
 }
 
+func TestDog(t *testing.T) {
+	assert := assert.New(t)
+	newDog := (sw.Dog{})
+	jsonDog := `{"breed":"Shepherd","className":"dog","color":"white"}`
+	json.Unmarshal([]byte(jsonDog), &newDog)
+	breedString := "Shepherd"
+	//assert.Nil(newDog)
+	assert.Equal(*newDog.Breed, breedString, "Breed should be `Shepherd`")
+}