[Elixir] Deserialize responses based on status code (#2355)

* Update Tesla dependency and replace Poison with Jason

* Use new Tesla method to set headers

* Fix jason dependency definition

* Use list for Headers instead of a map

* Rollback to Poison because Jason does not support 'as:' option to decode to arbitrary struct

* Use new return signature from Tesla 1.0 in decode function

* catch error when a struct is given as second parameter to RequestBuilder.decode

* Update modules/openapi-generator/src/main/resources/elixir/request_builder.ex.mustache

Co-Authored-By: yknx4 <yknx.4.b@gmail.com>

* Update modules/openapi-generator/src/main/resources/elixir/request_builder.ex.mustache

Co-Authored-By: yknx4 <yknx.4.b@gmail.com>

* Evaluate response based on status code

* Generate Petstore

* pin poison to ~> 3.0.0 since 4.0.0 does not work atm

* run ./bin/openapi3/elixir-petstore.sh

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

@@ -23,6 +23,7 @@ import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.info.Info;
 import io.swagger.v3.oas.models.media.ArraySchema;
 import io.swagger.v3.oas.models.media.Schema;
+import io.swagger.v3.oas.models.responses.ApiResponse;
 import org.apache.commons.lang3.StringUtils;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.utils.ModelUtils;
@@ -53,7 +54,7 @@ public class ElixirClientCodegen extends DefaultCodegen implements CodegenConfig
     List<String> extraApplications = Arrays.asList(":logger");
     List<String> deps = Arrays.asList(
             "{:tesla, \"~> 1.0.0\"}",
-            "{:poison, \">= 1.0.0\"}"
+            "{:poison, \"~> 3.0.0\"}"
     );
 
     public ElixirClientCodegen() {
@@ -310,6 +311,11 @@ public class ElixirClientCodegen extends DefaultCodegen implements CodegenConfig
         return new ExtendedCodegenModel(cm);
     }
 
+    @Override
+    public CodegenResponse fromResponse(String responseCode, ApiResponse resp) {
+        return new ExtendedCodegenResponse(super.fromResponse(responseCode, resp));
+    }
+
     // We should use String.join if we can use Java8
     String join(CharSequence charSequence, Iterable<String> iterable) {
         StringBuilder buf = new StringBuilder();
@@ -515,6 +521,91 @@ public class ElixirClientCodegen extends DefaultCodegen implements CodegenConfig
         return toModelName(type);
     }
 
+    class ExtendedCodegenResponse extends CodegenResponse {
+        public boolean isDefinedDefault;
+
+        public ExtendedCodegenResponse(CodegenResponse o) {
+            super();
+
+            this.headers.addAll(o.headers);
+            this.code = o.code;
+            this.message = o.message;
+            this.hasMore = o.hasMore;
+            this.examples = o.examples;
+            this.dataType = o.dataType;
+            this.baseType = o.baseType;
+            this.containerType = o.containerType;
+            this.hasHeaders = o.hasHeaders;
+            this.isString = o.isString;
+            this.isNumeric = o.isNumeric;
+            this.isInteger = o.isInteger;
+            this.isLong = o.isLong;
+            this.isNumber = o.isNumber;
+            this.isFloat = o.isFloat;
+            this.isDouble = o.isDouble;
+            this.isByteArray = o.isByteArray;
+            this.isBoolean = o.isBoolean;
+            this.isDate = o.isDate;
+            this.isDateTime = o.isDateTime;
+            this.isUuid = o.isUuid;
+            this.isEmail = o.isEmail;
+            this.isModel = o.isModel;
+            this.isFreeFormObject = o.isFreeFormObject;
+            this.isDefault = o.isDefault;
+            this.simpleType = o.simpleType;
+            this.primitiveType = o.primitiveType;
+            this.isMapContainer = o.isMapContainer;
+            this.isListContainer = o.isListContainer;
+            this.isBinary = o.isBinary;
+            this.isFile = o.isFile;
+            this.schema = o.schema;
+            this.jsonSchema = o.jsonSchema;
+            this.vendorExtensions = o.vendorExtensions;
+
+            this.isDefinedDefault = (this.code.equals("0") || this.code.equals("default"));
+        }
+
+        public String codeMappingKey(){
+            if(this.isDefinedDefault) {
+                return ":default";
+            }
+
+            if(code.matches("^\\d{3}$")){
+                return code;
+            }
+
+            LOGGER.warn("Unknown HTTP status code: " + this.code);
+            return "\"" + code + "\"";
+        }
+
+        public String decodedStruct() {
+            // Let Poison decode the entire response into a generic blob
+            if (isMapContainer) {
+                return "%{}";
+            }
+            // Primitive return type, don't even try to decode
+            if (baseType == null || (simpleType && primitiveType)) {
+                return "false";
+            } else if (isListContainer && languageSpecificPrimitives().contains(baseType)) {
+                return "[]";
+            }
+            StringBuilder sb = new StringBuilder();
+            if (isListContainer) {
+                sb.append("[");
+            }
+            sb.append("%");
+            sb.append(moduleName);
+            sb.append(".Model.");
+            sb.append(baseType);
+            sb.append("{}");
+            if (isListContainer) {
+                sb.append("]");
+            }
+            return sb.toString();
+        }
+
+    }
+
     class ExtendedCodegenOperation extends CodegenOperation {
         private List<String> pathTemplateNames = new ArrayList<String>();
         private String replacedPathName;
@@ -688,32 +779,6 @@ public class ElixirClientCodegen extends DefaultCodegen implements CodegenConfig
                 sb.append(".t");
             }
         }
-
-        public String decodedStruct() {
-            // Let Poison decode the entire response into a generic blob
-            if (isMapContainer) {
-                return "";
-            }
-            // Primitive return type, don't even try to decode
-            if (returnBaseType == null || (returnSimpleType && returnTypeIsPrimitive)) {
-                return "false";
-            } else if (isListContainer && languageSpecificPrimitives().contains(returnBaseType)) {
-                return "[]";
-            }
-            StringBuilder sb = new StringBuilder();
-            if (isListContainer) {
-                sb.append("[");
-            }
-            sb.append("%");
-            sb.append(moduleName);
-            sb.append(".Model.");
-            sb.append(returnBaseType);
-            sb.append("{}");
-            if (isListContainer) {
-                sb.append("]");
-            }
-            return sb.toString();
-        }
     }
 
     class ExtendedCodegenModel extends CodegenModel {

modules/openapi-generator/src/main/resources/elixir/api.mustache

@@ -12,21 +12,21 @@ defmodule {{moduleName}}.Api.{{classname}} do
 
   @doc """
   {{#summary}}
-  {{summary}}
+  {{&summary}}
   {{/summary}}
   {{#notes}}
-  {{notes}}
+  {{&notes}}
   {{/notes}}
 
   ## Parameters
 
   - connection ({{moduleName}}.Connection): Connection to server
 {{#requiredParams}}
-  - {{#underscored}}{{paramName}}{{/underscored}} ({{dataType}}): {{description}}
+  - {{#underscored}}{{paramName}}{{/underscored}} ({{dataType}}): {{&description}}
 {{/requiredParams}}
   - opts (KeywordList): [optional] Optional parameters
 {{#optionalParams}}
-    - {{#underscored}}:{{paramName}}{{/underscored}} ({{dataType}}): {{description}}
+    - {{#underscored}}:{{paramName}}{{/underscored}} ({{dataType}}): {{&description}}
 {{/optionalParams}}
   ## Returns
 
@@ -59,7 +59,10 @@ defmodule {{moduleName}}.Api.{{classname}} do
 {{/optionalParams}}
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode({{decodedStruct}})
+    |> evaluate_response({{#responses}}{{#-first}}[
+{{/-first}}
+      { {{& codeMappingKey}}, {{decodedStruct}}}{{#hasMore}},{{/hasMore}}
+{{#-last}}    ]{{/-last}}{{/responses}})
   end
   {{/operation}}
 {{/operations}}

modules/openapi-generator/src/main/resources/elixir/request_builder.ex.mustache

@@ -107,7 +107,7 @@ defmodule {{moduleName}}.RequestBuilder do
 
   ## Parameters
 
-  - arg1 ({:ok, Tesla.Env.t} | term) - The response object
+  - arg1 (Tesla.Env.t | term) - The response object
   - arg2 (:false | struct | [struct]) - The shape of the struct to deserialize into
 
   ## Returns
@@ -115,16 +115,26 @@ defmodule {{moduleName}}.RequestBuilder do
   {:ok, struct} on success
   {:error, term} on failure
   """
-  @spec decode({:ok, Tesla.Env.t} | term()) :: {:ok, struct()} | {:error, Tesla.Env.t} | {:error, term()}
+  @spec decode(Tesla.Env.t() | term(), false | struct() | [struct()]) ::
-  def decode({:ok, %Tesla.Env{status: 200, body: body}}), do: Poison.decode(body)
+          {:ok, struct()} | {:ok, Tesla.Env.t()} | {:error, any}
-  def decode(response), do: {:error, response}
+  def decode(%Tesla.Env{} = env, false), do: {:ok, env}
-  def decode({:error, _} = error), do: error
+  def decode(%Tesla.Env{body: body}, struct), do: Poison.decode(body, as: struct)
-  def decode(response), do: {:error, response}
 
-  @spec decode({:ok, Tesla.Env.t} | term(), :false | struct() | [struct()]) :: {:ok, struct()} | {:error, Tesla.Env.t} | {:error, term()}
+  def evaluate_response({:ok, %Tesla.Env{} = env}, mapping) do
-  def decode({:ok, %Tesla.Env{status: 200}} = env, false), do: {:ok, env}
+    resolve_mapping(env, mapping)
-  def decode({:ok, %Tesla.Env{status: 200, body: body}}, struct), do: Poison.decode(body, as: struct)
+  end
-  def decode({:ok, %Tesla.Env{} = response}, _struct), do: {:error, response}
+
-  def decode({:error, _} = error, _struct), do: error
+  def evaluate_response({:error, _} = error, _), do: error
-  def decode(response, _struct), do: {:error, response}
+
+  def resolve_mapping(env, mapping, default \\ nil)
+
+  def resolve_mapping(%Tesla.Env{status: status} = env, [{mapping_status, struct} | _], _)
+      when status == mapping_status do
+    decode(env, struct)
+  end
+
+  def resolve_mapping(env, [{:default, struct} | tail], _), do: resolve_mapping(env, tail, struct)
+  def resolve_mapping(env, [_ | tail], struct), do: resolve_mapping(env, tail, struct)
+  def resolve_mapping(env, [], nil), do: {:error, env}
+  def resolve_mapping(env, [], struct), do: decode(env, struct)
 end

samples/client/petstore/elixir/.openapi-generator/VERSION

@@ -1 +1 @@
-3.3.4-SNAPSHOT
+4.0.0-SNAPSHOT

samples/client/petstore/elixir/README.md

@@ -1,18 +1,18 @@
-# OpenapiPetstore
+# OpenAPIPetstore
 
 This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
 
 ## Installation
 
 If [available in Hex](https://hex.pm/docs/publish), the package can be installed
-by adding `openapi_petstore` to your list of dependencies in `mix.exs`:
+by adding `open_api_petstore` to your list of dependencies in `mix.exs`:
 
 ```elixir
 def deps do
-  [{:openapi_petstore, "~> 0.1.0"}]
+  [{:open_api_petstore, "~> 0.1.0"}]
 end
 ```
 
 Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
 and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
-be found at [https://hexdocs.pm/openapi_petstore](https://hexdocs.pm/openapi_petstore).
+be found at [https://hexdocs.pm/open_api_petstore](https://hexdocs.pm/open_api_petstore).

samples/client/petstore/elixir/lib/open_api_petstore/api/another_fake.ex

@@ -0,0 +1,40 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Api.AnotherFake do
+  @moduledoc """
+  API calls for all endpoints tagged `AnotherFake`.
+  """
+
+  alias OpenAPIPetstore.Connection
+  import OpenAPIPetstore.RequestBuilder
+
+
+  @doc """
+  To test special tags
+  To test special tags and operation ID starting with number
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - client (Client): client model
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.Client{}} on success
+  {:error, info} on failure
+  """
+  @spec call_123_test_special_tags(Tesla.Env.client, OpenAPIPetstore.Model.Client.t, keyword()) :: {:ok, OpenAPIPetstore.Model.Client.t} | {:error, Tesla.Env.t}
+  def call_123_test_special_tags(connection, client, _opts \\ []) do
+    %{}
+    |> method(:patch)
+    |> url("/another-fake/dummy")
+    |> add_param(:body, :body, client)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %OpenAPIPetstore.Model.Client{}}
+    ])
+  end
+end

samples/client/petstore/elixir/lib/open_api_petstore/api/default.ex

@@ -0,0 +1,36 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Api.Default do
+  @moduledoc """
+  API calls for all endpoints tagged `Default`.
+  """
+
+  alias OpenAPIPetstore.Connection
+  import OpenAPIPetstore.RequestBuilder
+
+
+  @doc """
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.InlineResponseDefault{}} on success
+  {:error, info} on failure
+  """
+  @spec foo_get(Tesla.Env.client, keyword()) :: {:ok, OpenAPIPetstore.Model.InlineResponseDefault.t} | {:error, Tesla.Env.t}
+  def foo_get(connection, _opts \\ []) do
+    %{}
+    |> method(:get)
+    |> url("/foo")
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { :default, %OpenAPIPetstore.Model.InlineResponseDefault{}}
+    ])
+  end
+end

samples/client/petstore/elixir/lib/open_api_petstore/api/fake.ex

@@ -0,0 +1,429 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Api.Fake do
+  @moduledoc """
+  API calls for all endpoints tagged `Fake`.
+  """
+
+  alias OpenAPIPetstore.Connection
+  import OpenAPIPetstore.RequestBuilder
+
+
+  @doc """
+  Health check endpoint
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.HealthCheckResult{}} on success
+  {:error, info} on failure
+  """
+  @spec fake_health_get(Tesla.Env.client, keyword()) :: {:ok, OpenAPIPetstore.Model.HealthCheckResult.t} | {:error, Tesla.Env.t}
+  def fake_health_get(connection, _opts \\ []) do
+    %{}
+    |> method(:get)
+    |> url("/fake/health")
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %OpenAPIPetstore.Model.HealthCheckResult{}}
+    ])
+  end
+
+  @doc """
+  Test serialization of outer boolean types
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - opts (KeywordList): [optional] Optional parameters
+    - :body (boolean()): Input boolean as post body
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.boolean(){}} on success
+  {:error, info} on failure
+  """
+  @spec fake_outer_boolean_serialize(Tesla.Env.client, keyword()) :: {:ok, Boolean.t} | {:error, Tesla.Env.t}
+  def fake_outer_boolean_serialize(connection, opts \\ []) do
+    optional_params = %{
+      :"body" => :body
+    }
+    %{}
+    |> method(:post)
+    |> url("/fake/outer/boolean")
+    |> add_optional_params(optional_params, opts)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, false}
+    ])
+  end
+
+  @doc """
+  Test serialization of object with outer number type
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - opts (KeywordList): [optional] Optional parameters
+    - :outer_composite (OuterComposite): Input composite as post body
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.OuterComposite{}} on success
+  {:error, info} on failure
+  """
+  @spec fake_outer_composite_serialize(Tesla.Env.client, keyword()) :: {:ok, OpenAPIPetstore.Model.OuterComposite.t} | {:error, Tesla.Env.t}
+  def fake_outer_composite_serialize(connection, opts \\ []) do
+    optional_params = %{
+      :"OuterComposite" => :body
+    }
+    %{}
+    |> method(:post)
+    |> url("/fake/outer/composite")
+    |> add_optional_params(optional_params, opts)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %OpenAPIPetstore.Model.OuterComposite{}}
+    ])
+  end
+
+  @doc """
+  Test serialization of outer number types
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - opts (KeywordList): [optional] Optional parameters
+    - :body (float()): Input number as post body
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.float(){}} on success
+  {:error, info} on failure
+  """
+  @spec fake_outer_number_serialize(Tesla.Env.client, keyword()) :: {:ok, Float.t} | {:error, Tesla.Env.t}
+  def fake_outer_number_serialize(connection, opts \\ []) do
+    optional_params = %{
+      :"body" => :body
+    }
+    %{}
+    |> method(:post)
+    |> url("/fake/outer/number")
+    |> add_optional_params(optional_params, opts)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, false}
+    ])
+  end
+
+  @doc """
+  Test serialization of outer string types
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - opts (KeywordList): [optional] Optional parameters
+    - :body (String.t): Input string as post body
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.String.t{}} on success
+  {:error, info} on failure
+  """
+  @spec fake_outer_string_serialize(Tesla.Env.client, keyword()) :: {:ok, String.t} | {:error, Tesla.Env.t}
+  def fake_outer_string_serialize(connection, opts \\ []) do
+    optional_params = %{
+      :"body" => :body
+    }
+    %{}
+    |> method(:post)
+    |> url("/fake/outer/string")
+    |> add_optional_params(optional_params, opts)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, false}
+    ])
+  end
+
+  @doc """
+  For this test, the body for this request much reference a schema named `File`.
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - file_schema_test_class (FileSchemaTestClass): 
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec test_body_with_file_schema(Tesla.Env.client, OpenAPIPetstore.Model.FileSchemaTestClass.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def test_body_with_file_schema(connection, file_schema_test_class, _opts \\ []) do
+    %{}
+    |> method(:put)
+    |> url("/fake/body-with-file-schema")
+    |> add_param(:body, :body, file_schema_test_class)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, false}
+    ])
+  end
+
+  @doc """
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - query (String.t): 
+  - user (User): 
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec test_body_with_query_params(Tesla.Env.client, String.t, OpenAPIPetstore.Model.User.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def test_body_with_query_params(connection, query, user, _opts \\ []) do
+    %{}
+    |> method(:put)
+    |> url("/fake/body-with-query-params")
+    |> add_param(:query, :"query", query)
+    |> add_param(:body, :body, user)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, false}
+    ])
+  end
+
+  @doc """
+  To test \"client\" model
+  To test \"client\" model
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - client (Client): client model
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.Client{}} on success
+  {:error, info} on failure
+  """
+  @spec test_client_model(Tesla.Env.client, OpenAPIPetstore.Model.Client.t, keyword()) :: {:ok, OpenAPIPetstore.Model.Client.t} | {:error, Tesla.Env.t}
+  def test_client_model(connection, client, _opts \\ []) do
+    %{}
+    |> method(:patch)
+    |> url("/fake")
+    |> add_param(:body, :body, client)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %OpenAPIPetstore.Model.Client{}}
+    ])
+  end
+
+  @doc """
+  Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+  Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - number (float()): None
+  - double (float()): None
+  - pattern_without_delimiter (String.t): None
+  - byte (binary()): None
+  - opts (KeywordList): [optional] Optional parameters
+    - :integer (integer()): None
+    - :int32 (integer()): None
+    - :int64 (integer()): None
+    - :float (float()): None
+    - :string (String.t): None
+    - :binary (String.t): None
+    - :date (Date.t): None
+    - :date_time (DateTime.t): None
+    - :password (String.t): None
+    - :callback (String.t): None
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec test_endpoint_parameters(Tesla.Env.client, float(), float(), String.t, binary(), keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def test_endpoint_parameters(connection, number, double, pattern_without_delimiter, byte, opts \\ []) do
+    optional_params = %{
+      :"integer" => :form,
+      :"int32" => :form,
+      :"int64" => :form,
+      :"float" => :form,
+      :"string" => :form,
+      :"binary" => :form,
+      :"date" => :form,
+      :"dateTime" => :form,
+      :"password" => :form,
+      :"callback" => :form
+    }
+    %{}
+    |> method(:post)
+    |> url("/fake")
+    |> add_param(:form, :"number", number)
+    |> add_param(:form, :"double", double)
+    |> add_param(:form, :"pattern_without_delimiter", pattern_without_delimiter)
+    |> add_param(:form, :"byte", byte)
+    |> add_optional_params(optional_params, opts)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 400, false},
+      { 404, false}
+    ])
+  end
+
+  @doc """
+  To test enum parameters
+  To test enum parameters
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - opts (KeywordList): [optional] Optional parameters
+    - :enum_header_string_array ([String.t]): Header parameter enum test (string array)
+    - :enum_header_string (String.t): Header parameter enum test (string)
+    - :enum_query_string_array ([String.t]): Query parameter enum test (string array)
+    - :enum_query_string (String.t): Query parameter enum test (string)
+    - :enum_query_integer (integer()): Query parameter enum test (double)
+    - :enum_query_double (float()): Query parameter enum test (double)
+    - :enum_form_string_array ([String.t]): Form parameter enum test (string array)
+    - :enum_form_string (String.t): Form parameter enum test (string)
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec test_enum_parameters(Tesla.Env.client, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def test_enum_parameters(connection, opts \\ []) do
+    optional_params = %{
+      :"enum_header_string_array" => :headers,
+      :"enum_header_string" => :headers,
+      :"enum_query_string_array" => :query,
+      :"enum_query_string" => :query,
+      :"enum_query_integer" => :query,
+      :"enum_query_double" => :query,
+      :"enum_form_string_array" => :form,
+      :"enum_form_string" => :form
+    }
+    %{}
+    |> method(:get)
+    |> url("/fake")
+    |> add_optional_params(optional_params, opts)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 400, false},
+      { 404, false}
+    ])
+  end
+
+  @doc """
+  Fake endpoint to test group parameters (optional)
+  Fake endpoint to test group parameters (optional)
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - required_string_group (integer()): Required String in group parameters
+  - required_boolean_group (boolean()): Required Boolean in group parameters
+  - required_int64_group (integer()): Required Integer in group parameters
+  - opts (KeywordList): [optional] Optional parameters
+    - :string_group (integer()): String in group parameters
+    - :boolean_group (boolean()): Boolean in group parameters
+    - :int64_group (integer()): Integer in group parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec test_group_parameters(Tesla.Env.client, integer(), boolean(), integer(), keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def test_group_parameters(connection, required_string_group, required_boolean_group, required_int64_group, opts \\ []) do
+    optional_params = %{
+      :"string_group" => :query,
+      :"boolean_group" => :headers,
+      :"int64_group" => :query
+    }
+    %{}
+    |> method(:delete)
+    |> url("/fake")
+    |> add_param(:query, :"required_string_group", required_string_group)
+    |> add_param(:headers, :"required_boolean_group", required_boolean_group)
+    |> add_param(:query, :"required_int64_group", required_int64_group)
+    |> add_optional_params(optional_params, opts)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 400, false}
+    ])
+  end
+
+  @doc """
+  test inline additionalProperties
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - request_body (%{optional(String.t) => String.t}): request body
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec test_inline_additional_properties(Tesla.Env.client, %{optional(String.t) => String.t}, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def test_inline_additional_properties(connection, request_body, _opts \\ []) do
+    %{}
+    |> method(:post)
+    |> url("/fake/inline-additionalProperties")
+    |> add_param(:body, :body, request_body)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, false}
+    ])
+  end
+
+  @doc """
+  test json serialization of form data
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - param (String.t): field1
+  - param2 (String.t): field2
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec test_json_form_data(Tesla.Env.client, String.t, String.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def test_json_form_data(connection, param, param2, _opts \\ []) do
+    %{}
+    |> method(:get)
+    |> url("/fake/jsonFormData")
+    |> add_param(:form, :"param", param)
+    |> add_param(:form, :"param2", param2)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, false}
+    ])
+  end
+end

samples/client/petstore/elixir/lib/open_api_petstore/api/fake_classname_tags123.ex

@@ -0,0 +1,40 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Api.FakeClassnameTags123 do
+  @moduledoc """
+  API calls for all endpoints tagged `FakeClassnameTags123`.
+  """
+
+  alias OpenAPIPetstore.Connection
+  import OpenAPIPetstore.RequestBuilder
+
+
+  @doc """
+  To test class name in snake case
+  To test class name in snake case
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - client (Client): client model
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.Client{}} on success
+  {:error, info} on failure
+  """
+  @spec test_classname(Tesla.Env.client, OpenAPIPetstore.Model.Client.t, keyword()) :: {:ok, OpenAPIPetstore.Model.Client.t} | {:error, Tesla.Env.t}
+  def test_classname(connection, client, _opts \\ []) do
+    %{}
+    |> method(:patch)
+    |> url("/fake_classname_test")
+    |> add_param(:body, :body, client)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %OpenAPIPetstore.Model.Client{}}
+    ])
+  end
+end

samples/client/petstore/elixir/lib/open_api_petstore/api/pet.ex

@@ -0,0 +1,277 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Api.Pet do
+  @moduledoc """
+  API calls for all endpoints tagged `Pet`.
+  """
+
+  alias OpenAPIPetstore.Connection
+  import OpenAPIPetstore.RequestBuilder
+
+
+  @doc """
+  Add a new pet to the store
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - pet (Pet): Pet object that needs to be added to the store
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec add_pet(Tesla.Env.client, OpenAPIPetstore.Model.Pet.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def add_pet(connection, pet, _opts \\ []) do
+    %{}
+    |> method(:post)
+    |> url("/pet")
+    |> add_param(:body, :body, pet)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 405, false}
+    ])
+  end
+
+  @doc """
+  Deletes a pet
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - pet_id (integer()): Pet id to delete
+  - opts (KeywordList): [optional] Optional parameters
+    - :api_key (String.t): 
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec delete_pet(Tesla.Env.client, integer(), keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def delete_pet(connection, pet_id, opts \\ []) do
+    optional_params = %{
+      :"api_key" => :headers
+    }
+    %{}
+    |> method(:delete)
+    |> url("/pet/#{pet_id}")
+    |> add_optional_params(optional_params, opts)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 400, false}
+    ])
+  end
+
+  @doc """
+  Finds Pets by status
+  Multiple status values can be provided with comma separated strings
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - status ([String.t]): Status values that need to be considered for filter
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, [%Pet{}, ...]} on success
+  {:error, info} on failure
+  """
+  @spec find_pets_by_status(Tesla.Env.client, list(String.t), keyword()) :: {:ok, list(OpenAPIPetstore.Model.Pet.t)} | {:error, Tesla.Env.t}
+  def find_pets_by_status(connection, status, _opts \\ []) do
+    %{}
+    |> method(:get)
+    |> url("/pet/findByStatus")
+    |> add_param(:query, :"status", status)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, [%OpenAPIPetstore.Model.Pet{}]},
+      { 400, false}
+    ])
+  end
+
+  @doc """
+  Finds Pets by tags
+  Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - tags ([String.t]): Tags to filter by
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, [%Pet{}, ...]} on success
+  {:error, info} on failure
+  """
+  @spec find_pets_by_tags(Tesla.Env.client, list(String.t), keyword()) :: {:ok, list(OpenAPIPetstore.Model.Pet.t)} | {:error, Tesla.Env.t}
+  def find_pets_by_tags(connection, tags, _opts \\ []) do
+    %{}
+    |> method(:get)
+    |> url("/pet/findByTags")
+    |> add_param(:query, :"tags", tags)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, [%OpenAPIPetstore.Model.Pet{}]},
+      { 400, false}
+    ])
+  end
+
+  @doc """
+  Find pet by ID
+  Returns a single pet
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - pet_id (integer()): ID of pet to return
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.Pet{}} on success
+  {:error, info} on failure
+  """
+  @spec get_pet_by_id(Tesla.Env.client, integer(), keyword()) :: {:ok, OpenAPIPetstore.Model.Pet.t} | {:error, Tesla.Env.t}
+  def get_pet_by_id(connection, pet_id, _opts \\ []) do
+    %{}
+    |> method(:get)
+    |> url("/pet/#{pet_id}")
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %OpenAPIPetstore.Model.Pet{}},
+      { 400, false},
+      { 404, false}
+    ])
+  end
+
+  @doc """
+  Update an existing pet
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - pet (Pet): Pet object that needs to be added to the store
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec update_pet(Tesla.Env.client, OpenAPIPetstore.Model.Pet.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def update_pet(connection, pet, _opts \\ []) do
+    %{}
+    |> method(:put)
+    |> url("/pet")
+    |> add_param(:body, :body, pet)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 400, false},
+      { 404, false},
+      { 405, false}
+    ])
+  end
+
+  @doc """
+  Updates a pet in the store with form data
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - pet_id (integer()): ID of pet that needs to be updated
+  - opts (KeywordList): [optional] Optional parameters
+    - :name (String.t): Updated name of the pet
+    - :status (String.t): Updated status of the pet
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec update_pet_with_form(Tesla.Env.client, integer(), keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def update_pet_with_form(connection, pet_id, opts \\ []) do
+    optional_params = %{
+      :"name" => :form,
+      :"status" => :form
+    }
+    %{}
+    |> method(:post)
+    |> url("/pet/#{pet_id}")
+    |> add_optional_params(optional_params, opts)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 405, false}
+    ])
+  end
+
+  @doc """
+  uploads an image
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - pet_id (integer()): ID of pet to update
+  - opts (KeywordList): [optional] Optional parameters
+    - :additional_metadata (String.t): Additional data to pass to server
+    - :file (String.t): file to upload
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.ApiResponse{}} on success
+  {:error, info} on failure
+  """
+  @spec upload_file(Tesla.Env.client, integer(), keyword()) :: {:ok, OpenAPIPetstore.Model.ApiResponse.t} | {:error, Tesla.Env.t}
+  def upload_file(connection, pet_id, opts \\ []) do
+    optional_params = %{
+      :"additionalMetadata" => :form,
+      :"file" => :form
+    }
+    %{}
+    |> method(:post)
+    |> url("/pet/#{pet_id}/uploadImage")
+    |> add_optional_params(optional_params, opts)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %OpenAPIPetstore.Model.ApiResponse{}}
+    ])
+  end
+
+  @doc """
+  uploads an image (required)
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - pet_id (integer()): ID of pet to update
+  - required_file (String.t): file to upload
+  - opts (KeywordList): [optional] Optional parameters
+    - :additional_metadata (String.t): Additional data to pass to server
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.ApiResponse{}} on success
+  {:error, info} on failure
+  """
+  @spec upload_file_with_required_file(Tesla.Env.client, integer(), String.t, keyword()) :: {:ok, OpenAPIPetstore.Model.ApiResponse.t} | {:error, Tesla.Env.t}
+  def upload_file_with_required_file(connection, pet_id, required_file, opts \\ []) do
+    optional_params = %{
+      :"additionalMetadata" => :form
+    }
+    %{}
+    |> method(:post)
+    |> url("/fake/#{pet_id}/uploadImageWithRequiredFile")
+    |> add_param(:file, :"requiredFile", required_file)
+    |> add_optional_params(optional_params, opts)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %OpenAPIPetstore.Model.ApiResponse{}}
+    ])
+  end
+end

samples/client/petstore/elixir/lib/open_api_petstore/api/store.ex

@@ -0,0 +1,120 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Api.Store do
+  @moduledoc """
+  API calls for all endpoints tagged `Store`.
+  """
+
+  alias OpenAPIPetstore.Connection
+  import OpenAPIPetstore.RequestBuilder
+
+
+  @doc """
+  Delete purchase order by ID
+  For valid response try integer IDs with value < 1000. Anything above 1000 or nonintegers will generate API errors
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - order_id (String.t): ID of the order that needs to be deleted
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec delete_order(Tesla.Env.client, String.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def delete_order(connection, order_id, _opts \\ []) do
+    %{}
+    |> method(:delete)
+    |> url("/store/order/#{order_id}")
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 400, false},
+      { 404, false}
+    ])
+  end
+
+  @doc """
+  Returns pet inventories by status
+  Returns a map of status codes to quantities
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec get_inventory(Tesla.Env.client, keyword()) :: {:ok, map()} | {:error, Tesla.Env.t}
+  def get_inventory(connection, _opts \\ []) do
+    %{}
+    |> method(:get)
+    |> url("/store/inventory")
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %{}}
+    ])
+  end
+
+  @doc """
+  Find purchase order by ID
+  For valid response try integer IDs with value <= 5 or > 10. Other values will generated exceptions
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - order_id (integer()): ID of pet that needs to be fetched
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.Order{}} on success
+  {:error, info} on failure
+  """
+  @spec get_order_by_id(Tesla.Env.client, integer(), keyword()) :: {:ok, OpenAPIPetstore.Model.Order.t} | {:error, Tesla.Env.t}
+  def get_order_by_id(connection, order_id, _opts \\ []) do
+    %{}
+    |> method(:get)
+    |> url("/store/order/#{order_id}")
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %OpenAPIPetstore.Model.Order{}},
+      { 400, false},
+      { 404, false}
+    ])
+  end
+
+  @doc """
+  Place an order for a pet
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - order (Order): order placed for purchasing the pet
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.Order{}} on success
+  {:error, info} on failure
+  """
+  @spec place_order(Tesla.Env.client, OpenAPIPetstore.Model.Order.t, keyword()) :: {:ok, OpenAPIPetstore.Model.Order.t} | {:error, Tesla.Env.t}
+  def place_order(connection, order, _opts \\ []) do
+    %{}
+    |> method(:post)
+    |> url("/store/order")
+    |> add_param(:body, :body, order)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %OpenAPIPetstore.Model.Order{}},
+      { 400, false}
+    ])
+  end
+end

samples/client/petstore/elixir/lib/open_api_petstore/api/user.ex

@@ -0,0 +1,228 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Api.User do
+  @moduledoc """
+  API calls for all endpoints tagged `User`.
+  """
+
+  alias OpenAPIPetstore.Connection
+  import OpenAPIPetstore.RequestBuilder
+
+
+  @doc """
+  Create user
+  This can only be done by the logged in user.
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - user (User): Created user object
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec create_user(Tesla.Env.client, OpenAPIPetstore.Model.User.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def create_user(connection, user, _opts \\ []) do
+    %{}
+    |> method(:post)
+    |> url("/user")
+    |> add_param(:body, :body, user)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { :default, false}
+    ])
+  end
+
+  @doc """
+  Creates list of users with given input array
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - user ([User]): List of user object
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec create_users_with_array_input(Tesla.Env.client, list(OpenAPIPetstore.Model.User.t), keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def create_users_with_array_input(connection, user, _opts \\ []) do
+    %{}
+    |> method(:post)
+    |> url("/user/createWithArray")
+    |> add_param(:body, :body, user)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { :default, false}
+    ])
+  end
+
+  @doc """
+  Creates list of users with given input array
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - user ([User]): List of user object
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec create_users_with_list_input(Tesla.Env.client, list(OpenAPIPetstore.Model.User.t), keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def create_users_with_list_input(connection, user, _opts \\ []) do
+    %{}
+    |> method(:post)
+    |> url("/user/createWithList")
+    |> add_param(:body, :body, user)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { :default, false}
+    ])
+  end
+
+  @doc """
+  Delete user
+  This can only be done by the logged in user.
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - username (String.t): The name that needs to be deleted
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec delete_user(Tesla.Env.client, String.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def delete_user(connection, username, _opts \\ []) do
+    %{}
+    |> method(:delete)
+    |> url("/user/#{username}")
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 400, false},
+      { 404, false}
+    ])
+  end
+
+  @doc """
+  Get user by user name
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - username (String.t): The name that needs to be fetched. Use user1 for testing.
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.User{}} on success
+  {:error, info} on failure
+  """
+  @spec get_user_by_name(Tesla.Env.client, String.t, keyword()) :: {:ok, OpenAPIPetstore.Model.User.t} | {:error, Tesla.Env.t}
+  def get_user_by_name(connection, username, _opts \\ []) do
+    %{}
+    |> method(:get)
+    |> url("/user/#{username}")
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, %OpenAPIPetstore.Model.User{}},
+      { 400, false},
+      { 404, false}
+    ])
+  end
+
+  @doc """
+  Logs user into the system
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - username (String.t): The user name for login
+  - password (String.t): The password for login in clear text
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %OpenAPIPetstore.Model.String.t{}} on success
+  {:error, info} on failure
+  """
+  @spec login_user(Tesla.Env.client, String.t, String.t, keyword()) :: {:ok, String.t} | {:error, Tesla.Env.t}
+  def login_user(connection, username, password, _opts \\ []) do
+    %{}
+    |> method(:get)
+    |> url("/user/login")
+    |> add_param(:query, :"username", username)
+    |> add_param(:query, :"password", password)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, false},
+      { 400, false}
+    ])
+  end
+
+  @doc """
+  Logs out current logged in user session
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec logout_user(Tesla.Env.client, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def logout_user(connection, _opts \\ []) do
+    %{}
+    |> method(:get)
+    |> url("/user/logout")
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { :default, false}
+    ])
+  end
+
+  @doc """
+  Updated user
+  This can only be done by the logged in user.
+
+  ## Parameters
+
+  - connection (OpenAPIPetstore.Connection): Connection to server
+  - username (String.t): name that need to be deleted
+  - user (User): Updated user object
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec update_user(Tesla.Env.client, String.t, OpenAPIPetstore.Model.User.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def update_user(connection, username, user, _opts \\ []) do
+    %{}
+    |> method(:put)
+    |> url("/user/#{username}")
+    |> add_param(:body, :body, user)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 400, false},
+      { 404, false}
+    ])
+  end
+end

samples/client/petstore/elixir/lib/open_api_petstore/connection.ex

@@ -0,0 +1,104 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Connection do
+  @moduledoc """
+  Handle Tesla connections for OpenAPIPetstore.
+  """
+
+  use Tesla
+
+  # Add any middleware here (authentication)
+  plug Tesla.Middleware.BaseUrl, "http://petstore.swagger.io:80/v2"
+  plug Tesla.Middleware.Headers, [{"user-agent", "Elixir"}]
+  plug Tesla.Middleware.EncodeJson, engine: Poison
+
+  @doc """
+  Configure a client connection using Basic authentication.
+
+  ## Parameters
+
+  - username (String): Username used for authentication
+  - password (String): Password used for authentication
+
+  # Returns
+
+  Tesla.Env.client
+  """
+  @spec new(String.t, String.t) :: Tesla.Env.client
+  def new(username, password) do
+    Tesla.build_client([
+      {Tesla.Middleware.BasicAuth, %{username: username, password: password}}
+    ])
+  end
+  @doc """
+  Configure a client connection using Basic authentication.
+
+  ## Parameters
+
+  - username (String): Username used for authentication
+  - password (String): Password used for authentication
+
+  # Returns
+
+  Tesla.Env.client
+  """
+  @spec new(String.t, String.t) :: Tesla.Env.client
+  def new(username, password) do
+    Tesla.build_client([
+      {Tesla.Middleware.BasicAuth, %{username: username, password: password}}
+    ])
+  end
+  @scopes [
+    "write:pets", # modify pets in your account
+    "read:pets" # read your pets
+  ]
+
+  @doc """
+  Configure a client connection using a provided OAuth2 token as a Bearer token
+
+  ## Parameters
+
+  - token (String): Bearer token
+
+  ## Returns
+
+  Tesla.Env.client
+  """
+  @spec new(String.t) :: Tesla.Env.client
+  def new(token) when is_binary(token) do
+    Tesla.build_client([
+      {Tesla.Middleware.Headers,  [{"authorization", "Bearer #{token}"}]}
+    ])
+  end
+
+  @doc """
+  Configure a client connection using a function which yields a Bearer token.
+
+  ## Parameters
+
+  - token_fetcher (function arity of 1): Callback which provides an OAuth2 token
+    given a list of scopes
+
+  ## Returns
+
+  Tesla.Env.client
+  """
+  @spec new(((list(String.t)) -> String.t)) :: Tesla.Env.client
+  def new(token_fetcher) when is_function(token_fetcher) do
+    token_fetcher.(@scopes)
+    |> new
+  end
+  @doc """
+  Configure an authless client connection
+
+  # Returns
+
+  Tesla.Env.client
+  """
+  @spec new() :: Tesla.Env.client
+  def new do
+    Tesla.build_client([])
+  end
+end

samples/client/petstore/elixir/lib/open_api_petstore/deserializer.ex

@@ -0,0 +1,38 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Deserializer do
+  @moduledoc """
+  Helper functions for deserializing responses into models
+  """
+
+  @doc """
+  Update the provided model with a deserialization of a nested value
+  """
+  @spec deserialize(struct(), :atom, :atom, struct(), keyword()) :: struct()
+  def deserialize(model, field, :list, mod, options) do
+    model
+    |> Map.update!(field, &(Poison.Decode.decode(&1, Keyword.merge(options, [as: [struct(mod)]]))))
+  end
+  def deserialize(model, field, :struct, mod, options) do
+    model
+    |> Map.update!(field, &(Poison.Decode.decode(&1, Keyword.merge(options, [as: struct(mod)]))))
+  end
+  def deserialize(model, field, :map, mod, options) do
+    model
+    |> Map.update!(field, &(Map.new(&1, fn {key, val} -> {key, Poison.Decode.decode(val, Keyword.merge(options, [as: struct(mod)]))} end)))
+  end
+  def deserialize(model, field, :date, _, _options) do
+    value = Map.get(model, field)
+    case is_binary(value) do
+      true -> case DateTime.from_iso8601(value) do
+                {:ok, datetime, _offset} ->
+                  Map.put(model, field, datetime)
+                _ ->
+                  model
+              end
+      false -> model
+    end
+  end
+end

samples/client/petstore/elixir/lib/open_api_petstore/model/_special_model_name_.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.SpecialModelName do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"$special[property.name]"
+  ]
+
+  @type t :: %__MODULE__{
+    :"$special[property.name]" => integer() | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.SpecialModelName do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/additional_properties_class.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.AdditionalPropertiesClass do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"map_property",
+    :"map_of_map_property"
+  ]
+
+  @type t :: %__MODULE__{
+    :"map_property" => %{optional(String.t) => String.t} | nil,
+    :"map_of_map_property" => %{optional(String.t) => %{optional(String.t) => String.t}} | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.AdditionalPropertiesClass do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/animal.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Animal do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"className",
+    :"color"
+  ]
+
+  @type t :: %__MODULE__{
+    :"className" => String.t,
+    :"color" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Animal do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/api_response.ex

@@ -0,0 +1,29 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.ApiResponse do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"code",
+    :"type",
+    :"message"
+  ]
+
+  @type t :: %__MODULE__{
+    :"code" => integer() | nil,
+    :"type" => String.t | nil,
+    :"message" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.ApiResponse do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/array_of_array_of_number_only.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.ArrayOfArrayOfNumberOnly do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"ArrayArrayNumber"
+  ]
+
+  @type t :: %__MODULE__{
+    :"ArrayArrayNumber" => [[float()]] | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.ArrayOfArrayOfNumberOnly do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/array_of_number_only.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.ArrayOfNumberOnly do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"ArrayNumber"
+  ]
+
+  @type t :: %__MODULE__{
+    :"ArrayNumber" => [float()] | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.ArrayOfNumberOnly do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/array_test.ex

@@ -0,0 +1,29 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.ArrayTest do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"array_of_string",
+    :"array_array_of_integer",
+    :"array_array_of_model"
+  ]
+
+  @type t :: %__MODULE__{
+    :"array_of_string" => [String.t] | nil,
+    :"array_array_of_integer" => [[integer()]] | nil,
+    :"array_array_of_model" => [[ReadOnlyFirst]] | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.ArrayTest do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/capitalization.ex

@@ -0,0 +1,35 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Capitalization do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"smallCamel",
+    :"CapitalCamel",
+    :"small_Snake",
+    :"Capital_Snake",
+    :"SCA_ETH_Flow_Points",
+    :"ATT_NAME"
+  ]
+
+  @type t :: %__MODULE__{
+    :"smallCamel" => String.t | nil,
+    :"CapitalCamel" => String.t | nil,
+    :"small_Snake" => String.t | nil,
+    :"Capital_Snake" => String.t | nil,
+    :"SCA_ETH_Flow_Points" => String.t | nil,
+    :"ATT_NAME" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Capitalization do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/cat.ex

@@ -0,0 +1,29 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Cat do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"className",
+    :"color",
+    :"declawed"
+  ]
+
+  @type t :: %__MODULE__{
+    :"className" => String.t,
+    :"color" => String.t | nil,
+    :"declawed" => boolean() | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Cat do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/category.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Category do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"id",
+    :"name"
+  ]
+
+  @type t :: %__MODULE__{
+    :"id" => integer() | nil,
+    :"name" => String.t
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Category do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/class_model.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.ClassModel do
+  @moduledoc """
+  Model for testing model with \"_class\" property
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"_class"
+  ]
+
+  @type t :: %__MODULE__{
+    :"_class" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.ClassModel do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/client.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Client do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"client"
+  ]
+
+  @type t :: %__MODULE__{
+    :"client" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Client do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/dog.ex

@@ -0,0 +1,29 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Dog do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"className",
+    :"color",
+    :"breed"
+  ]
+
+  @type t :: %__MODULE__{
+    :"className" => String.t,
+    :"color" => String.t | nil,
+    :"breed" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Dog do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/enum_arrays.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.EnumArrays do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"just_symbol",
+    :"array_enum"
+  ]
+
+  @type t :: %__MODULE__{
+    :"just_symbol" => String.t | nil,
+    :"array_enum" => [String.t] | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.EnumArrays do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/enum_class.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.EnumClass do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    
+  ]
+
+  @type t :: %__MODULE__{
+    
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.EnumClass do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/enum_test.ex

@@ -0,0 +1,44 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.EnumTest do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"enum_string",
+    :"enum_string_required",
+    :"enum_integer",
+    :"enum_number",
+    :"outerEnum",
+    :"outerEnumInteger",
+    :"outerEnumDefaultValue",
+    :"outerEnumIntegerDefaultValue"
+  ]
+
+  @type t :: %__MODULE__{
+    :"enum_string" => String.t | nil,
+    :"enum_string_required" => String.t,
+    :"enum_integer" => integer() | nil,
+    :"enum_number" => float() | nil,
+    :"outerEnum" => OuterEnum | nil,
+    :"outerEnumInteger" => OuterEnumInteger | nil,
+    :"outerEnumDefaultValue" => OuterEnumDefaultValue | nil,
+    :"outerEnumIntegerDefaultValue" => OuterEnumIntegerDefaultValue | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.EnumTest do
+  import OpenAPIPetstore.Deserializer
+  def decode(value, options) do
+    value
+    |> deserialize(:"outerEnum", :struct, OpenAPIPetstore.Model.OuterEnum, options)
+    |> deserialize(:"outerEnumInteger", :struct, OpenAPIPetstore.Model.OuterEnumInteger, options)
+    |> deserialize(:"outerEnumDefaultValue", :struct, OpenAPIPetstore.Model.OuterEnumDefaultValue, options)
+    |> deserialize(:"outerEnumIntegerDefaultValue", :struct, OpenAPIPetstore.Model.OuterEnumIntegerDefaultValue, options)
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/file_schema_test_class.ex

@@ -0,0 +1,30 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.FileSchemaTestClass do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"file",
+    :"files"
+  ]
+
+  @type t :: %__MODULE__{
+    :"file" => File | nil,
+    :"files" => [File] | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.FileSchemaTestClass do
+  import OpenAPIPetstore.Deserializer
+  def decode(value, options) do
+    value
+    |> deserialize(:"file", :struct, OpenAPIPetstore.Model.File, options)
+    |> deserialize(:"files", :list, OpenAPIPetstore.Model.File, options)
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/foo.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Foo do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"bar"
+  ]
+
+  @type t :: %__MODULE__{
+    :"bar" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Foo do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/format_test.ex

@@ -0,0 +1,55 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.FormatTest do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"integer",
+    :"int32",
+    :"int64",
+    :"number",
+    :"float",
+    :"double",
+    :"string",
+    :"byte",
+    :"binary",
+    :"date",
+    :"dateTime",
+    :"uuid",
+    :"password",
+    :"pattern_with_digits",
+    :"pattern_with_digits_and_delimiter"
+  ]
+
+  @type t :: %__MODULE__{
+    :"integer" => integer() | nil,
+    :"int32" => integer() | nil,
+    :"int64" => integer() | nil,
+    :"number" => float(),
+    :"float" => float() | nil,
+    :"double" => float() | nil,
+    :"string" => String.t | nil,
+    :"byte" => binary(),
+    :"binary" => String.t | nil,
+    :"date" => Date.t,
+    :"dateTime" => DateTime.t | nil,
+    :"uuid" => String.t | nil,
+    :"password" => String.t,
+    :"pattern_with_digits" => String.t | nil,
+    :"pattern_with_digits_and_delimiter" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.FormatTest do
+  import OpenAPIPetstore.Deserializer
+  def decode(value, options) do
+    value
+    |> deserialize(:"date", :date, nil, options)
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/has_only_read_only.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.HasOnlyReadOnly do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"bar",
+    :"foo"
+  ]
+
+  @type t :: %__MODULE__{
+    :"bar" => String.t | nil,
+    :"foo" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.HasOnlyReadOnly do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/health_check_result.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.HealthCheckResult do
+  @moduledoc """
+  Just a string to inform instance is up and running. Make it nullable in hope to get it as pointer in generated model.
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"NullableMessage"
+  ]
+
+  @type t :: %__MODULE__{
+    :"NullableMessage" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.HealthCheckResult do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/inline_object.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.InlineObject do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"name",
+    :"status"
+  ]
+
+  @type t :: %__MODULE__{
+    :"name" => String.t | nil,
+    :"status" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.InlineObject do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/inline_object_1.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.InlineObject1 do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"additionalMetadata",
+    :"file"
+  ]
+
+  @type t :: %__MODULE__{
+    :"additionalMetadata" => String.t | nil,
+    :"file" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.InlineObject1 do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/inline_object_2.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.InlineObject2 do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"enum_form_string_array",
+    :"enum_form_string"
+  ]
+
+  @type t :: %__MODULE__{
+    :"enum_form_string_array" => [String.t] | nil,
+    :"enum_form_string" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.InlineObject2 do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/inline_object_3.ex

@@ -0,0 +1,53 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.InlineObject3 do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"integer",
+    :"int32",
+    :"int64",
+    :"number",
+    :"float",
+    :"double",
+    :"string",
+    :"pattern_without_delimiter",
+    :"byte",
+    :"binary",
+    :"date",
+    :"dateTime",
+    :"password",
+    :"callback"
+  ]
+
+  @type t :: %__MODULE__{
+    :"integer" => integer() | nil,
+    :"int32" => integer() | nil,
+    :"int64" => integer() | nil,
+    :"number" => float(),
+    :"float" => float() | nil,
+    :"double" => float(),
+    :"string" => String.t | nil,
+    :"pattern_without_delimiter" => String.t,
+    :"byte" => binary(),
+    :"binary" => String.t | nil,
+    :"date" => Date.t | nil,
+    :"dateTime" => DateTime.t | nil,
+    :"password" => String.t | nil,
+    :"callback" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.InlineObject3 do
+  import OpenAPIPetstore.Deserializer
+  def decode(value, options) do
+    value
+    |> deserialize(:"date", :date, nil, options)
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/inline_object_4.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.InlineObject4 do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"param",
+    :"param2"
+  ]
+
+  @type t :: %__MODULE__{
+    :"param" => String.t,
+    :"param2" => String.t
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.InlineObject4 do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/inline_object_5.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.InlineObject5 do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"additionalMetadata",
+    :"requiredFile"
+  ]
+
+  @type t :: %__MODULE__{
+    :"additionalMetadata" => String.t | nil,
+    :"requiredFile" => String.t
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.InlineObject5 do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/inline_response_default.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.InlineResponseDefault do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"string"
+  ]
+
+  @type t :: %__MODULE__{
+    :"string" => Foo | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.InlineResponseDefault do
+  import OpenAPIPetstore.Deserializer
+  def decode(value, options) do
+    value
+    |> deserialize(:"string", :struct, OpenAPIPetstore.Model.Foo, options)
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/map_test.ex

@@ -0,0 +1,31 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.MapTest do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"map_map_of_string",
+    :"map_of_enum_string",
+    :"direct_map",
+    :"indirect_map"
+  ]
+
+  @type t :: %__MODULE__{
+    :"map_map_of_string" => %{optional(String.t) => %{optional(String.t) => String.t}} | nil,
+    :"map_of_enum_string" => %{optional(String.t) => String.t} | nil,
+    :"direct_map" => %{optional(String.t) => boolean()} | nil,
+    :"indirect_map" => %{optional(String.t) => boolean()} | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.MapTest do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/mixed_properties_and_additional_properties_class.ex

@@ -0,0 +1,31 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.MixedPropertiesAndAdditionalPropertiesClass do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"uuid",
+    :"dateTime",
+    :"map"
+  ]
+
+  @type t :: %__MODULE__{
+    :"uuid" => String.t | nil,
+    :"dateTime" => DateTime.t | nil,
+    :"map" => %{optional(String.t) => Animal} | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.MixedPropertiesAndAdditionalPropertiesClass do
+  import OpenAPIPetstore.Deserializer
+  def decode(value, options) do
+    value
+    |> deserialize(:"map", :map, OpenAPIPetstore.Model.Animal, options)
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/model_200_response.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Model200Response do
+  @moduledoc """
+  Model for testing model name starting with number
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"name",
+    :"class"
+  ]
+
+  @type t :: %__MODULE__{
+    :"name" => integer() | nil,
+    :"class" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Model200Response do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/name.ex

@@ -0,0 +1,31 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Name do
+  @moduledoc """
+  Model for testing model name same as property name
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"name",
+    :"snake_case",
+    :"property",
+    :"123Number"
+  ]
+
+  @type t :: %__MODULE__{
+    :"name" => integer(),
+    :"snake_case" => integer() | nil,
+    :"property" => String.t | nil,
+    :"123Number" => integer() | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Name do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/number_only.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.NumberOnly do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"JustNumber"
+  ]
+
+  @type t :: %__MODULE__{
+    :"JustNumber" => float() | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.NumberOnly do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/order.ex

@@ -0,0 +1,35 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Order do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"id",
+    :"petId",
+    :"quantity",
+    :"shipDate",
+    :"status",
+    :"complete"
+  ]
+
+  @type t :: %__MODULE__{
+    :"id" => integer() | nil,
+    :"petId" => integer() | nil,
+    :"quantity" => integer() | nil,
+    :"shipDate" => DateTime.t | nil,
+    :"status" => String.t | nil,
+    :"complete" => boolean() | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Order do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/outer_composite.ex

@@ -0,0 +1,29 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.OuterComposite do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"my_number",
+    :"my_string",
+    :"my_boolean"
+  ]
+
+  @type t :: %__MODULE__{
+    :"my_number" => float() | nil,
+    :"my_string" => String.t | nil,
+    :"my_boolean" => boolean() | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.OuterComposite do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/outer_enum.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.OuterEnum do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    
+  ]
+
+  @type t :: %__MODULE__{
+    
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.OuterEnum do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/outer_enum_default_value.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.OuterEnumDefaultValue do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    
+  ]
+
+  @type t :: %__MODULE__{
+    
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.OuterEnumDefaultValue do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/outer_enum_integer.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.OuterEnumInteger do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    
+  ]
+
+  @type t :: %__MODULE__{
+    
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.OuterEnumInteger do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/outer_enum_integer_default_value.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.OuterEnumIntegerDefaultValue do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    
+  ]
+
+  @type t :: %__MODULE__{
+    
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.OuterEnumIntegerDefaultValue do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/pet.ex

@@ -0,0 +1,38 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Pet do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"id",
+    :"category",
+    :"name",
+    :"photoUrls",
+    :"tags",
+    :"status"
+  ]
+
+  @type t :: %__MODULE__{
+    :"id" => integer() | nil,
+    :"category" => Category | nil,
+    :"name" => String.t,
+    :"photoUrls" => [String.t],
+    :"tags" => [Tag] | nil,
+    :"status" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Pet do
+  import OpenAPIPetstore.Deserializer
+  def decode(value, options) do
+    value
+    |> deserialize(:"category", :struct, OpenAPIPetstore.Model.Category, options)
+    |> deserialize(:"tags", :list, OpenAPIPetstore.Model.Tag, options)
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/read_only_first.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.ReadOnlyFirst do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"bar",
+    :"baz"
+  ]
+
+  @type t :: %__MODULE__{
+    :"bar" => String.t | nil,
+    :"baz" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.ReadOnlyFirst do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/return.ex

@@ -0,0 +1,25 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Return do
+  @moduledoc """
+  Model for testing reserved words
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"return"
+  ]
+
+  @type t :: %__MODULE__{
+    :"return" => integer() | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Return do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/tag.ex

@@ -0,0 +1,27 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.Tag do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"id",
+    :"name"
+  ]
+
+  @type t :: %__MODULE__{
+    :"id" => integer() | nil,
+    :"name" => String.t | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.Tag do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/model/user.ex

@@ -0,0 +1,39 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.Model.User do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"id",
+    :"username",
+    :"firstName",
+    :"lastName",
+    :"email",
+    :"password",
+    :"phone",
+    :"userStatus"
+  ]
+
+  @type t :: %__MODULE__{
+    :"id" => integer() | nil,
+    :"username" => String.t | nil,
+    :"firstName" => String.t | nil,
+    :"lastName" => String.t | nil,
+    :"email" => String.t | nil,
+    :"password" => String.t | nil,
+    :"phone" => String.t | nil,
+    :"userStatus" => integer() | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenAPIPetstore.Model.User do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/open_api_petstore/request_builder.ex

@@ -0,0 +1,143 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenAPIPetstore.RequestBuilder do
+  @moduledoc """
+  Helper functions for building Tesla requests
+  """
+
+  @doc """
+  Specify the request method when building a request
+
+  ## Parameters
+
+  - request (Map) - Collected request options
+  - m (atom) - Request method
+
+  ## Returns
+
+  Map
+  """
+  @spec method(map(), atom) :: map()
+  def method(request, m) do
+    Map.put_new(request, :method, m)
+  end
+
+  @doc """
+  Specify the request method when building a request
+
+  ## Parameters
+
+  - request (Map) - Collected request options
+  - u (String) - Request URL
+
+  ## Returns
+
+  Map
+  """
+  @spec url(map(), String.t) :: map()
+  def url(request, u) do
+    Map.put_new(request, :url, u)
+  end
+
+  @doc """
+  Add optional parameters to the request
+
+  ## Parameters
+
+  - request (Map) - Collected request options
+  - definitions (Map) - Map of parameter name to parameter location.
+  - options (KeywordList) - The provided optional parameters
+
+  ## Returns
+
+  Map
+  """
+  @spec add_optional_params(map(), %{optional(atom) => atom}, keyword()) :: map()
+  def add_optional_params(request, _, []), do: request
+  def add_optional_params(request, definitions, [{key, value} | tail]) do
+    case definitions do
+      %{^key => location} ->
+        request
+        |> add_param(location, key, value)
+        |> add_optional_params(definitions, tail)
+      _ ->
+        add_optional_params(request, definitions, tail)
+    end
+  end
+
+  @doc """
+  Add optional parameters to the request
+
+  ## Parameters
+
+  - request (Map) - Collected request options
+  - location (atom) - Where to put the parameter
+  - key (atom) - The name of the parameter
+  - value (any) - The value of the parameter
+
+  ## Returns
+
+  Map
+  """
+  @spec add_param(map(), atom, atom, any()) :: map()
+  def add_param(request, :body, :body, value), do: Map.put(request, :body, value)
+  def add_param(request, :body, key, value) do
+    request
+    |> Map.put_new_lazy(:body, &Tesla.Multipart.new/0)
+    |> Map.update!(:body, &(Tesla.Multipart.add_field(&1, key, Poison.encode!(value), headers: [{:"Content-Type", "application/json"}])))
+  end
+  def add_param(request, :headers, key, value) do
+    request
+    |> Tesla.put_header(key, value)
+  end
+  def add_param(request, :file, name, path) do
+    request
+    |> Map.put_new_lazy(:body, &Tesla.Multipart.new/0)
+    |> Map.update!(:body, &(Tesla.Multipart.add_file(&1, path, name: name)))
+  end
+  def add_param(request, :form, name, value) do
+    request
+    |> Map.update(:body, %{name => value}, &(Map.put(&1, name, value)))
+  end
+  def add_param(request, location, key, value) do
+    Map.update(request, location, [{key, value}], &(&1 ++ [{key, value}]))
+  end
+
+  @doc """
+  Handle the response for a Tesla request
+
+  ## Parameters
+
+  - arg1 (Tesla.Env.t | term) - The response object
+  - arg2 (:false | struct | [struct]) - The shape of the struct to deserialize into
+
+  ## Returns
+
+  {:ok, struct} on success
+  {:error, term} on failure
+  """
+  @spec decode(Tesla.Env.t() | term(), false | struct() | [struct()]) ::
+          {:ok, struct()} | {:ok, Tesla.Env.t()} | {:error, any}
+  def decode(%Tesla.Env{} = env, false), do: {:ok, env}
+  def decode(%Tesla.Env{body: body}, struct), do: Poison.decode(body, as: struct)
+
+  def evaluate_response({:ok, %Tesla.Env{} = env}, mapping) do
+    resolve_mapping(env, mapping)
+  end
+
+  def evaluate_response({:error, _} = error, _), do: error
+
+  def resolve_mapping(env, mapping, default \\ nil)
+
+  def resolve_mapping(%Tesla.Env{status: status} = env, [{mapping_status, struct} | _], _)
+      when status == mapping_status do
+    decode(env, struct)
+  end
+
+  def resolve_mapping(env, [{:default, struct} | tail], _), do: resolve_mapping(env, tail, struct)
+  def resolve_mapping(env, [_ | tail], struct), do: resolve_mapping(env, tail, struct)
+  def resolve_mapping(env, [], nil), do: {:error, env}
+  def resolve_mapping(env, [], struct), do: decode(env, struct)
+end

samples/client/petstore/elixir/lib/openapi_petstore/api/another_fake.ex

@@ -18,7 +18,7 @@ defmodule OpenapiPetstore.Api.AnotherFake do
   ## Parameters
 
   - connection (OpenapiPetstore.Connection): Connection to server
-  - client (Client): client model
+  - body (Client): client model
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -26,13 +26,15 @@ defmodule OpenapiPetstore.Api.AnotherFake do
   {:error, info} on failure
   """
   @spec call_123_test_special_tags(Tesla.Env.client, OpenapiPetstore.Model.Client.t, keyword()) :: {:ok, OpenapiPetstore.Model.Client.t} | {:error, Tesla.Env.t}
-  def call_123_test_special_tags(connection, client, _opts \\ []) do
+  def call_123_test_special_tags(connection, body, _opts \\ []) do
     %{}
     |> method(:patch)
     |> url("/another-fake/dummy")
-    |> add_param(:body, :body, client)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(%OpenapiPetstore.Model.Client{})
+    |> evaluate_response([
+      { 200, %OpenapiPetstore.Model.Client{}}
+    ])
   end
 end

samples/client/petstore/elixir/lib/openapi_petstore/api/fake.ex

@@ -11,6 +11,33 @@ defmodule OpenapiPetstore.Api.Fake do
   import OpenapiPetstore.RequestBuilder
 
 
+  @doc """
+  creates an XmlItem
+  this route creates an XmlItem
+
+  ## Parameters
+
+  - connection (OpenapiPetstore.Connection): Connection to server
+  - xml_item (XmlItem): XmlItem Body
+  - opts (KeywordList): [optional] Optional parameters
+  ## Returns
+
+  {:ok, %{}} on success
+  {:error, info} on failure
+  """
+  @spec create_xml_item(Tesla.Env.client, OpenapiPetstore.Model.XmlItem.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
+  def create_xml_item(connection, xml_item, _opts \\ []) do
+    %{}
+    |> method(:post)
+    |> url("/fake/create_xml_item")
+    |> add_param(:body, :body, xml_item)
+    |> Enum.into([])
+    |> (&Connection.request(connection, &1)).()
+    |> evaluate_response([
+      { 200, false}
+    ])
+  end
+
   @doc """
   Test serialization of outer boolean types
 
@@ -35,7 +62,9 @@ defmodule OpenapiPetstore.Api.Fake do
     |> add_optional_params(optional_params, opts)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 200, false}
+    ])
   end
 
   @doc """
@@ -45,7 +74,7 @@ defmodule OpenapiPetstore.Api.Fake do
 
   - connection (OpenapiPetstore.Connection): Connection to server
   - opts (KeywordList): [optional] Optional parameters
-    - :outer_composite (OuterComposite): Input composite as post body
+    - :body (OuterComposite): Input composite as post body
   ## Returns
 
   {:ok, %OpenapiPetstore.Model.OuterComposite{}} on success
@@ -54,7 +83,7 @@ defmodule OpenapiPetstore.Api.Fake do
   @spec fake_outer_composite_serialize(Tesla.Env.client, keyword()) :: {:ok, OpenapiPetstore.Model.OuterComposite.t} | {:error, Tesla.Env.t}
   def fake_outer_composite_serialize(connection, opts \\ []) do
     optional_params = %{
-      :"OuterComposite" => :body
+      :"body" => :body
     }
     %{}
     |> method(:post)
@@ -62,7 +91,9 @@ defmodule OpenapiPetstore.Api.Fake do
     |> add_optional_params(optional_params, opts)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(%OpenapiPetstore.Model.OuterComposite{})
+    |> evaluate_response([
+      { 200, %OpenapiPetstore.Model.OuterComposite{}}
+    ])
   end
 
   @doc """
@@ -89,7 +120,9 @@ defmodule OpenapiPetstore.Api.Fake do
     |> add_optional_params(optional_params, opts)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 200, false}
+    ])
   end
 
   @doc """
@@ -116,16 +149,18 @@ defmodule OpenapiPetstore.Api.Fake do
     |> add_optional_params(optional_params, opts)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 200, false}
+    ])
   end
 
   @doc """
-  For this test, the body for this request much reference a schema named `File`.
+  For this test, the body for this request much reference a schema named `File`.
 
   ## Parameters
 
   - connection (OpenapiPetstore.Connection): Connection to server
-  - file_schema_test_class (FileSchemaTestClass): 
+  - body (FileSchemaTestClass): 
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -133,14 +168,16 @@ defmodule OpenapiPetstore.Api.Fake do
   {:error, info} on failure
   """
   @spec test_body_with_file_schema(Tesla.Env.client, OpenapiPetstore.Model.FileSchemaTestClass.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
-  def test_body_with_file_schema(connection, file_schema_test_class, _opts \\ []) do
+  def test_body_with_file_schema(connection, body, _opts \\ []) do
     %{}
     |> method(:put)
     |> url("/fake/body-with-file-schema")
-    |> add_param(:body, :body, file_schema_test_class)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 200, false}
+    ])
   end
 
   @doc """
@@ -149,7 +186,7 @@ defmodule OpenapiPetstore.Api.Fake do
 
   - connection (OpenapiPetstore.Connection): Connection to server
   - query (String.t): 
-  - user (User): 
+  - body (User): 
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -157,25 +194,27 @@ defmodule OpenapiPetstore.Api.Fake do
   {:error, info} on failure
   """
   @spec test_body_with_query_params(Tesla.Env.client, String.t, OpenapiPetstore.Model.User.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
-  def test_body_with_query_params(connection, query, user, _opts \\ []) do
+  def test_body_with_query_params(connection, query, body, _opts \\ []) do
     %{}
     |> method(:put)
     |> url("/fake/body-with-query-params")
     |> add_param(:query, :"query", query)
-    |> add_param(:body, :body, user)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 200, false}
+    ])
   end
 
   @doc """
-  To test \"client\" model
+  To test \"client\" model
-  To test \"client\" model
+  To test \"client\" model
 
   ## Parameters
 
   - connection (OpenapiPetstore.Connection): Connection to server
-  - client (Client): client model
+  - body (Client): client model
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -183,14 +222,16 @@ defmodule OpenapiPetstore.Api.Fake do
   {:error, info} on failure
   """
   @spec test_client_model(Tesla.Env.client, OpenapiPetstore.Model.Client.t, keyword()) :: {:ok, OpenapiPetstore.Model.Client.t} | {:error, Tesla.Env.t}
-  def test_client_model(connection, client, _opts \\ []) do
+  def test_client_model(connection, body, _opts \\ []) do
     %{}
     |> method(:patch)
     |> url("/fake")
-    |> add_param(:body, :body, client)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(%OpenapiPetstore.Model.Client{})
+    |> evaluate_response([
+      { 200, %OpenapiPetstore.Model.Client{}}
+    ])
   end
 
   @doc """
@@ -244,7 +285,10 @@ defmodule OpenapiPetstore.Api.Fake do
     |> add_optional_params(optional_params, opts)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 400, false},
+      { 404, false}
+    ])
   end
 
   @doc """
@@ -286,7 +330,10 @@ defmodule OpenapiPetstore.Api.Fake do
     |> add_optional_params(optional_params, opts)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 400, false},
+      { 404, false}
+    ])
   end
 
   @doc """
@@ -324,7 +371,9 @@ defmodule OpenapiPetstore.Api.Fake do
     |> add_optional_params(optional_params, opts)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 400, false}
+    ])
   end
 
   @doc """
@@ -333,7 +382,7 @@ defmodule OpenapiPetstore.Api.Fake do
   ## Parameters
 
   - connection (OpenapiPetstore.Connection): Connection to server
-  - request_body (%{optional(String.t) => String.t}): request body
+  - param (%{optional(String.t) => String.t}): request body
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -341,14 +390,16 @@ defmodule OpenapiPetstore.Api.Fake do
   {:error, info} on failure
   """
   @spec test_inline_additional_properties(Tesla.Env.client, %{optional(String.t) => String.t}, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
-  def test_inline_additional_properties(connection, request_body, _opts \\ []) do
+  def test_inline_additional_properties(connection, param, _opts \\ []) do
     %{}
     |> method(:post)
     |> url("/fake/inline-additionalProperties")
-    |> add_param(:body, :body, request_body)
+    |> add_param(:body, :body, param)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 200, false}
+    ])
   end
 
   @doc """
@@ -374,6 +425,8 @@ defmodule OpenapiPetstore.Api.Fake do
     |> add_param(:form, :"param2", param2)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 200, false}
+    ])
   end
 end

samples/client/petstore/elixir/lib/openapi_petstore/api/fake_classname_tags123.ex

@@ -18,7 +18,7 @@ defmodule OpenapiPetstore.Api.FakeClassnameTags123 do
   ## Parameters
 
   - connection (OpenapiPetstore.Connection): Connection to server
-  - client (Client): client model
+  - body (Client): client model
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -26,13 +26,15 @@ defmodule OpenapiPetstore.Api.FakeClassnameTags123 do
   {:error, info} on failure
   """
   @spec test_classname(Tesla.Env.client, OpenapiPetstore.Model.Client.t, keyword()) :: {:ok, OpenapiPetstore.Model.Client.t} | {:error, Tesla.Env.t}
-  def test_classname(connection, client, _opts \\ []) do
+  def test_classname(connection, body, _opts \\ []) do
     %{}
     |> method(:patch)
     |> url("/fake_classname_test")
-    |> add_param(:body, :body, client)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(%OpenapiPetstore.Model.Client{})
+    |> evaluate_response([
+      { 200, %OpenapiPetstore.Model.Client{}}
+    ])
   end
 end

samples/client/petstore/elixir/lib/openapi_petstore/api/pet.ex

@@ -17,7 +17,7 @@ defmodule OpenapiPetstore.Api.Pet do
   ## Parameters
 
   - connection (OpenapiPetstore.Connection): Connection to server
-  - pet (Pet): Pet object that needs to be added to the store
+  - body (Pet): Pet object that needs to be added to the store
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -25,14 +25,16 @@ defmodule OpenapiPetstore.Api.Pet do
   {:error, info} on failure
   """
   @spec add_pet(Tesla.Env.client, OpenapiPetstore.Model.Pet.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
-  def add_pet(connection, pet, _opts \\ []) do
+  def add_pet(connection, body, _opts \\ []) do
     %{}
     |> method(:post)
     |> url("/pet")
-    |> add_param(:body, :body, pet)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 405, false}
+    ])
   end
 
   @doc """
@@ -60,7 +62,9 @@ defmodule OpenapiPetstore.Api.Pet do
     |> add_optional_params(optional_params, opts)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 400, false}
+    ])
   end
 
   @doc """
@@ -85,7 +89,10 @@ defmodule OpenapiPetstore.Api.Pet do
     |> add_param(:query, :"status", status)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode([%OpenapiPetstore.Model.Pet{}])
+    |> evaluate_response([
+      { 200, [%OpenapiPetstore.Model.Pet{}]},
+      { 400, false}
+    ])
   end
 
   @doc """
@@ -110,7 +117,10 @@ defmodule OpenapiPetstore.Api.Pet do
     |> add_param(:query, :"tags", tags)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode([%OpenapiPetstore.Model.Pet{}])
+    |> evaluate_response([
+      { 200, [%OpenapiPetstore.Model.Pet{}]},
+      { 400, false}
+    ])
   end
 
   @doc """
@@ -134,7 +144,11 @@ defmodule OpenapiPetstore.Api.Pet do
     |> url("/pet/#{pet_id}")
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(%OpenapiPetstore.Model.Pet{})
+    |> evaluate_response([
+      { 200, %OpenapiPetstore.Model.Pet{}},
+      { 400, false},
+      { 404, false}
+    ])
   end
 
   @doc """
@@ -143,7 +157,7 @@ defmodule OpenapiPetstore.Api.Pet do
   ## Parameters
 
   - connection (OpenapiPetstore.Connection): Connection to server
-  - pet (Pet): Pet object that needs to be added to the store
+  - body (Pet): Pet object that needs to be added to the store
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -151,14 +165,18 @@ defmodule OpenapiPetstore.Api.Pet do
   {:error, info} on failure
   """
   @spec update_pet(Tesla.Env.client, OpenapiPetstore.Model.Pet.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
-  def update_pet(connection, pet, _opts \\ []) do
+  def update_pet(connection, body, _opts \\ []) do
     %{}
     |> method(:put)
     |> url("/pet")
-    |> add_param(:body, :body, pet)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 400, false},
+      { 404, false},
+      { 405, false}
+    ])
   end
 
   @doc """
@@ -188,7 +206,9 @@ defmodule OpenapiPetstore.Api.Pet do
     |> add_optional_params(optional_params, opts)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 405, false}
+    ])
   end
 
   @doc """
@@ -218,7 +238,9 @@ defmodule OpenapiPetstore.Api.Pet do
     |> add_optional_params(optional_params, opts)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(%OpenapiPetstore.Model.ApiResponse{})
+    |> evaluate_response([
+      { 200, %OpenapiPetstore.Model.ApiResponse{}}
+    ])
   end
 
   @doc """
@@ -248,6 +270,8 @@ defmodule OpenapiPetstore.Api.Pet do
     |> add_optional_params(optional_params, opts)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(%OpenapiPetstore.Model.ApiResponse{})
+    |> evaluate_response([
+      { 200, %OpenapiPetstore.Model.ApiResponse{}}
+    ])
   end
 end

samples/client/petstore/elixir/lib/openapi_petstore/api/store.ex

@@ -13,7 +13,7 @@ defmodule OpenapiPetstore.Api.Store do
 
   @doc """
   Delete purchase order by ID
-  For valid response try integer IDs with value < 1000. Anything above 1000 or nonintegers will generate API errors
+  For valid response try integer IDs with value < 1000. Anything above 1000 or nonintegers will generate API errors
 
   ## Parameters
 
@@ -32,7 +32,10 @@ defmodule OpenapiPetstore.Api.Store do
     |> url("/store/order/#{order_id}")
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 400, false},
+      { 404, false}
+    ])
   end
 
   @doc """
@@ -55,12 +58,14 @@ defmodule OpenapiPetstore.Api.Store do
     |> url("/store/inventory")
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode()
+    |> evaluate_response([
+      { 200, %{}}
+    ])
   end
 
   @doc """
   Find purchase order by ID
-  For valid response try integer IDs with value &lt;&#x3D; 5 or &gt; 10. Other values will generated exceptions
+  For valid response try integer IDs with value <= 5 or > 10. Other values will generated exceptions
 
   ## Parameters
 
@@ -79,7 +84,11 @@ defmodule OpenapiPetstore.Api.Store do
     |> url("/store/order/#{order_id}")
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(%OpenapiPetstore.Model.Order{})
+    |> evaluate_response([
+      { 200, %OpenapiPetstore.Model.Order{}},
+      { 400, false},
+      { 404, false}
+    ])
   end
 
   @doc """
@@ -88,7 +97,7 @@ defmodule OpenapiPetstore.Api.Store do
   ## Parameters
 
   - connection (OpenapiPetstore.Connection): Connection to server
-  - order (Order): order placed for purchasing the pet
+  - body (Order): order placed for purchasing the pet
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -96,13 +105,16 @@ defmodule OpenapiPetstore.Api.Store do
   {:error, info} on failure
   """
   @spec place_order(Tesla.Env.client, OpenapiPetstore.Model.Order.t, keyword()) :: {:ok, OpenapiPetstore.Model.Order.t} | {:error, Tesla.Env.t}
-  def place_order(connection, order, _opts \\ []) do
+  def place_order(connection, body, _opts \\ []) do
     %{}
     |> method(:post)
     |> url("/store/order")
-    |> add_param(:body, :body, order)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(%OpenapiPetstore.Model.Order{})
+    |> evaluate_response([
+      { 200, %OpenapiPetstore.Model.Order{}},
+      { 400, false}
+    ])
   end
 end

samples/client/petstore/elixir/lib/openapi_petstore/api/user.ex

@@ -18,7 +18,7 @@ defmodule OpenapiPetstore.Api.User do
   ## Parameters
 
   - connection (OpenapiPetstore.Connection): Connection to server
-  - user (User): Created user object
+  - body (User): Created user object
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -26,14 +26,16 @@ defmodule OpenapiPetstore.Api.User do
   {:error, info} on failure
   """
   @spec create_user(Tesla.Env.client, OpenapiPetstore.Model.User.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
-  def create_user(connection, user, _opts \\ []) do
+  def create_user(connection, body, _opts \\ []) do
     %{}
     |> method(:post)
     |> url("/user")
-    |> add_param(:body, :body, user)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { :default, false}
+    ])
   end
 
   @doc """
@@ -42,7 +44,7 @@ defmodule OpenapiPetstore.Api.User do
   ## Parameters
 
   - connection (OpenapiPetstore.Connection): Connection to server
-  - user ([User]): List of user object
+  - body ([User]): List of user object
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -50,14 +52,16 @@ defmodule OpenapiPetstore.Api.User do
   {:error, info} on failure
   """
   @spec create_users_with_array_input(Tesla.Env.client, list(OpenapiPetstore.Model.User.t), keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
-  def create_users_with_array_input(connection, user, _opts \\ []) do
+  def create_users_with_array_input(connection, body, _opts \\ []) do
     %{}
     |> method(:post)
     |> url("/user/createWithArray")
-    |> add_param(:body, :body, user)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { :default, false}
+    ])
   end
 
   @doc """
@@ -66,7 +70,7 @@ defmodule OpenapiPetstore.Api.User do
   ## Parameters
 
   - connection (OpenapiPetstore.Connection): Connection to server
-  - user ([User]): List of user object
+  - body ([User]): List of user object
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -74,14 +78,16 @@ defmodule OpenapiPetstore.Api.User do
   {:error, info} on failure
   """
   @spec create_users_with_list_input(Tesla.Env.client, list(OpenapiPetstore.Model.User.t), keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
-  def create_users_with_list_input(connection, user, _opts \\ []) do
+  def create_users_with_list_input(connection, body, _opts \\ []) do
     %{}
     |> method(:post)
     |> url("/user/createWithList")
-    |> add_param(:body, :body, user)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { :default, false}
+    ])
   end
 
   @doc """
@@ -105,7 +111,10 @@ defmodule OpenapiPetstore.Api.User do
     |> url("/user/#{username}")
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 400, false},
+      { 404, false}
+    ])
   end
 
   @doc """
@@ -128,7 +137,11 @@ defmodule OpenapiPetstore.Api.User do
     |> url("/user/#{username}")
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(%OpenapiPetstore.Model.User{})
+    |> evaluate_response([
+      { 200, %OpenapiPetstore.Model.User{}},
+      { 400, false},
+      { 404, false}
+    ])
   end
 
   @doc """
@@ -154,7 +167,10 @@ defmodule OpenapiPetstore.Api.User do
     |> add_param(:query, :"password", password)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 200, false},
+      { 400, false}
+    ])
   end
 
   @doc """
@@ -176,7 +192,9 @@ defmodule OpenapiPetstore.Api.User do
     |> url("/user/logout")
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { :default, false}
+    ])
   end
 
   @doc """
@@ -187,7 +205,7 @@ defmodule OpenapiPetstore.Api.User do
 
   - connection (OpenapiPetstore.Connection): Connection to server
   - username (String.t): name that need to be deleted
-  - user (User): Updated user object
+  - body (User): Updated user object
   - opts (KeywordList): [optional] Optional parameters
   ## Returns
 
@@ -195,13 +213,16 @@ defmodule OpenapiPetstore.Api.User do
   {:error, info} on failure
   """
   @spec update_user(Tesla.Env.client, String.t, OpenapiPetstore.Model.User.t, keyword()) :: {:ok, nil} | {:error, Tesla.Env.t}
-  def update_user(connection, username, user, _opts \\ []) do
+  def update_user(connection, username, body, _opts \\ []) do
     %{}
     |> method(:put)
     |> url("/user/#{username}")
-    |> add_param(:body, :body, user)
+    |> add_param(:body, :body, body)
     |> Enum.into([])
     |> (&Connection.request(connection, &1)).()
-    |> decode(false)
+    |> evaluate_response([
+      { 400, false},
+      { 404, false}
+    ])
   end
 end

samples/client/petstore/elixir/lib/openapi_petstore/model/type_holder_default.ex

@@ -0,0 +1,33 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenapiPetstore.Model.TypeHolderDefault do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"string_item",
+    :"number_item",
+    :"integer_item",
+    :"bool_item",
+    :"array_item"
+  ]
+
+  @type t :: %__MODULE__{
+    :"string_item" => String.t,
+    :"number_item" => float(),
+    :"integer_item" => integer(),
+    :"bool_item" => boolean(),
+    :"array_item" => [integer()]
+  }
+end
+
+defimpl Poison.Decoder, for: OpenapiPetstore.Model.TypeHolderDefault do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/openapi_petstore/model/type_holder_example.ex

@@ -0,0 +1,33 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenapiPetstore.Model.TypeHolderExample do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"string_item",
+    :"number_item",
+    :"integer_item",
+    :"bool_item",
+    :"array_item"
+  ]
+
+  @type t :: %__MODULE__{
+    :"string_item" => String.t,
+    :"number_item" => float(),
+    :"integer_item" => integer(),
+    :"bool_item" => boolean(),
+    :"array_item" => [integer()]
+  }
+end
+
+defimpl Poison.Decoder, for: OpenapiPetstore.Model.TypeHolderExample do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/openapi_petstore/model/xml_item.ex

@@ -0,0 +1,81 @@
+# NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+# https://openapi-generator.tech
+# Do not edit the class manually.
+
+defmodule OpenapiPetstore.Model.XmlItem do
+  @moduledoc """
+  
+  """
+
+  @derive [Poison.Encoder]
+  defstruct [
+    :"attribute_string",
+    :"attribute_number",
+    :"attribute_integer",
+    :"attribute_boolean",
+    :"wrapped_array",
+    :"name_string",
+    :"name_number",
+    :"name_integer",
+    :"name_boolean",
+    :"name_array",
+    :"name_wrapped_array",
+    :"prefix_string",
+    :"prefix_number",
+    :"prefix_integer",
+    :"prefix_boolean",
+    :"prefix_array",
+    :"prefix_wrapped_array",
+    :"namespace_string",
+    :"namespace_number",
+    :"namespace_integer",
+    :"namespace_boolean",
+    :"namespace_array",
+    :"namespace_wrapped_array",
+    :"prefix_ns_string",
+    :"prefix_ns_number",
+    :"prefix_ns_integer",
+    :"prefix_ns_boolean",
+    :"prefix_ns_array",
+    :"prefix_ns_wrapped_array"
+  ]
+
+  @type t :: %__MODULE__{
+    :"attribute_string" => String.t | nil,
+    :"attribute_number" => float() | nil,
+    :"attribute_integer" => integer() | nil,
+    :"attribute_boolean" => boolean() | nil,
+    :"wrapped_array" => [integer()] | nil,
+    :"name_string" => String.t | nil,
+    :"name_number" => float() | nil,
+    :"name_integer" => integer() | nil,
+    :"name_boolean" => boolean() | nil,
+    :"name_array" => [integer()] | nil,
+    :"name_wrapped_array" => [integer()] | nil,
+    :"prefix_string" => String.t | nil,
+    :"prefix_number" => float() | nil,
+    :"prefix_integer" => integer() | nil,
+    :"prefix_boolean" => boolean() | nil,
+    :"prefix_array" => [integer()] | nil,
+    :"prefix_wrapped_array" => [integer()] | nil,
+    :"namespace_string" => String.t | nil,
+    :"namespace_number" => float() | nil,
+    :"namespace_integer" => integer() | nil,
+    :"namespace_boolean" => boolean() | nil,
+    :"namespace_array" => [integer()] | nil,
+    :"namespace_wrapped_array" => [integer()] | nil,
+    :"prefix_ns_string" => String.t | nil,
+    :"prefix_ns_number" => float() | nil,
+    :"prefix_ns_integer" => integer() | nil,
+    :"prefix_ns_boolean" => boolean() | nil,
+    :"prefix_ns_array" => [integer()] | nil,
+    :"prefix_ns_wrapped_array" => [integer()] | nil
+  }
+end
+
+defimpl Poison.Decoder, for: OpenapiPetstore.Model.XmlItem do
+  def decode(value, _options) do
+    value
+  end
+end
+

samples/client/petstore/elixir/lib/openapi_petstore/request_builder.ex

@@ -110,7 +110,7 @@ defmodule OpenapiPetstore.RequestBuilder do
 
   ## Parameters
 
-  - arg1 ({:ok, Tesla.Env.t} | term) - The response object
+  - arg1 (Tesla.Env.t | term) - The response object
   - arg2 (:false | struct | [struct]) - The shape of the struct to deserialize into
 
   ## Returns
@@ -118,14 +118,26 @@ defmodule OpenapiPetstore.RequestBuilder do
   {:ok, struct} on success
   {:error, term} on failure
   """
-  @spec decode({:ok, Tesla.Env.t} | term()) :: {:ok, struct()} | {:error, Tesla.Env.t} | {:error, term()}
+  @spec decode(Tesla.Env.t() | term(), false | struct() | [struct()]) ::
-  def decode({:ok, %Tesla.Env{status: 200, body: body}}), do: Poison.decode(body)
+          {:ok, struct()} | {:ok, Tesla.Env.t()} | {:error, any}
-  def decode(response), do: {:error, response}
+  def decode(%Tesla.Env{} = env, false), do: {:ok, env}
-  def decode({:error, _} = error), do: error
+  def decode(%Tesla.Env{body: body}, struct), do: Poison.decode(body, as: struct)
 
-  @spec decode({:ok, Tesla.Env.t} | term(), :false | struct() | [struct()]) :: {:ok, struct()} | {:error, Tesla.Env.t} | {:error, term()}
+  def evaluate_response({:ok, %Tesla.Env{} = env}, mapping) do
-  def decode({:ok, %Tesla.Env{status: 200}} = env, false), do: {:ok, env}
+    resolve_mapping(env, mapping)
-  def decode({:ok, %Tesla.Env{status: 200, body: body}}, struct), do: Poison.decode(body, as: struct)
+  end
-  def decode({:error, _} = error, _struct), do: error
+
-  def decode(response, _struct), do: {:error, response}
+  def evaluate_response({:error, _} = error, _), do: error
+
+  def resolve_mapping(env, mapping, default \\ nil)
+
+  def resolve_mapping(%Tesla.Env{status: status} = env, [{mapping_status, struct} | _], _)
+      when status == mapping_status do
+    decode(env, struct)
+  end
+
+  def resolve_mapping(env, [{:default, struct} | tail], _), do: resolve_mapping(env, tail, struct)
+  def resolve_mapping(env, [_ | tail], struct), do: resolve_mapping(env, tail, struct)
+  def resolve_mapping(env, [], nil), do: {:error, env}
+  def resolve_mapping(env, [], struct), do: decode(env, struct)
 end

samples/client/petstore/elixir/mix.exs

@@ -1,8 +1,8 @@
-defmodule OpenapiPetstore.Mixfile do
+defmodule OpenAPIPetstore.Mixfile do
   use Mix.Project
 
   def project do
-    [app: :openapi_petstore,
+    [app: :open_api_petstore,
      version: "0.1.0",
      elixir: "~> 1.4",
      build_embedded: Mix.env == :prod,
@@ -30,7 +30,7 @@ defmodule OpenapiPetstore.Mixfile do
   defp deps do
     [
       {:tesla, "~> 1.0.0"},
-      {:poison, ">= 1.0.0"}
+      {:poison, "~> 3.0.0"}
     ]
   end
 end