From 1ed23a77cb2d3bba2e2203bd212ff7ab737455a1 Mon Sep 17 00:00:00 2001
From: meganemura <meganemura@users.noreply.github.com>
Date: Fri, 14 Dec 2018 18:06:54 +0900
Subject: [PATCH 1/4] Add Model.build_from_hash

---
 .../src/main/resources/ruby-client/base_object.mustache  | 7 +++++++
 .../ruby-client/partial_model_enum_class.mustache        | 9 ++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/modules/openapi-generator/src/main/resources/ruby-client/base_object.mustache b/modules/openapi-generator/src/main/resources/ruby-client/base_object.mustache
index faef2ae199e1..f96f8b408c23 100644
--- a/modules/openapi-generator/src/main/resources/ruby-client/base_object.mustache
+++ b/modules/openapi-generator/src/main/resources/ruby-client/base_object.mustache
@@ -1,3 +1,10 @@
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
diff --git a/modules/openapi-generator/src/main/resources/ruby-client/partial_model_enum_class.mustache b/modules/openapi-generator/src/main/resources/ruby-client/partial_model_enum_class.mustache
index 36cee9e79481..797bab82ab3d 100644
--- a/modules/openapi-generator/src/main/resources/ruby-client/partial_model_enum_class.mustache
+++ b/modules/openapi-generator/src/main/resources/ruby-client/partial_model_enum_class.mustache
@@ -2,6 +2,13 @@
     {{#allowableValues}}{{#enumVars}}
     {{{name}}} = {{{value}}}.freeze{{/enumVars}}{{/allowableValues}}
 
+    # Builds the enum from string
+    # @param [String] The enum value in the form of the string
+    # @return [String] The enum value
+    def self.build_from_hash(value)
+      new.build_from_hash(value)
+    end
+
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
     # @return [String] The enum value
@@ -10,4 +17,4 @@
       raise "Invalid ENUM value #{value} for class #{{{classname}}}" if constantValues.empty?
       value
     end
-  end
\ No newline at end of file
+  end

From 8138fdb148f7730b706afc49ac0816d256b1fff9 Mon Sep 17 00:00:00 2001
From: meganemura <meganemura@users.noreply.github.com>
Date: Fri, 14 Dec 2018 18:09:32 +0900
Subject: [PATCH 2/4] Use Model.build_from_hash instead of
 Model.new.build_from_hash

---
 .../src/main/resources/ruby-client/api_client.mustache      | 4 +---
 .../src/main/resources/ruby-client/base_object.mustache     | 3 +--
 .../resources/ruby-client/partial_model_generic.mustache    | 6 ++----
 3 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/modules/openapi-generator/src/main/resources/ruby-client/api_client.mustache b/modules/openapi-generator/src/main/resources/ruby-client/api_client.mustache
index 03b8ca31f928..02dfd6703a9d 100644
--- a/modules/openapi-generator/src/main/resources/ruby-client/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/ruby-client/api_client.mustache
@@ -204,9 +204,7 @@ module {{moduleName}}
         end
       else
         # models, e.g. Pet
-        {{moduleName}}.const_get(return_type).new.tap do |model|
-          model.build_from_hash data
-        end
+        {{moduleName}}.const_get(return_type).build_from_hash(data)
       end
     end
 
diff --git a/modules/openapi-generator/src/main/resources/ruby-client/base_object.mustache b/modules/openapi-generator/src/main/resources/ruby-client/base_object.mustache
index f96f8b408c23..9ebcde2c6c1b 100644
--- a/modules/openapi-generator/src/main/resources/ruby-client/base_object.mustache
+++ b/modules/openapi-generator/src/main/resources/ruby-client/base_object.mustache
@@ -65,8 +65,7 @@
           end
         end
       else # model
-        temp_model = {{moduleName}}.const_get(type).new
-        temp_model.build_from_hash(value)
+        {{moduleName}}.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/modules/openapi-generator/src/main/resources/ruby-client/partial_model_generic.mustache b/modules/openapi-generator/src/main/resources/ruby-client/partial_model_generic.mustache
index f6082b111ab9..17755675e7e0 100644
--- a/modules/openapi-generator/src/main/resources/ruby-client/partial_model_generic.mustache
+++ b/modules/openapi-generator/src/main/resources/ruby-client/partial_model_generic.mustache
@@ -239,8 +239,7 @@
       {{#-first}}
       _any_of_found = false
       openapi_any_of.each do |_class|
-        _any_of = {{moduleName}}.const_get(_class).new
-        _any_of.build_from_hash(self.to_hash)
+        _any_of = {{moduleName}}.const_get(_class).build_from_hash(self.to_hash)
         if _any_of.valid?
           _any_of_found = true
         end
@@ -256,8 +255,7 @@
       {{#-first}}
       _one_of_found = false
       openapi_one_of.each do |_class|
-        _one_of = {{moduleName}}.const_get(_class).new
-        _one_of.build_from_hash(self.to_hash)
+        _one_of = {{moduleName}}.const_get(_class).build_from_hash(self.to_hash)
         if _one_of.valid?
           if _one_of_found?
             return false

From f51a3130dce2da6f331f63c7d10ab63bfcdd1db4 Mon Sep 17 00:00:00 2001
From: meganemura <meganemura@users.noreply.github.com>
Date: Fri, 14 Dec 2018 18:26:42 +0900
Subject: [PATCH 3/4] Update sample for ruby-client

---
 .../client/petstore/ruby/lib/petstore/api_client.rb    |  4 +---
 .../lib/petstore/models/additional_properties_class.rb | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/animal.rb | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/api_response.rb  | 10 ++++++++--
 .../petstore/models/array_of_array_of_number_only.rb   | 10 ++++++++--
 .../ruby/lib/petstore/models/array_of_number_only.rb   | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/array_test.rb    | 10 ++++++++--
 .../ruby/lib/petstore/models/capitalization.rb         | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/cat.rb    | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/category.rb      | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/class_model.rb   | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/client.rb | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/dog.rb    | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/enum_arrays.rb   | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/enum_class.rb    |  8 ++++++++
 .../petstore/ruby/lib/petstore/models/enum_test.rb     | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/file.rb   | 10 ++++++++--
 .../ruby/lib/petstore/models/file_schema_test_class.rb | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/format_test.rb   | 10 ++++++++--
 .../ruby/lib/petstore/models/has_only_read_only.rb     | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/list.rb   | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/map_test.rb      | 10 ++++++++--
 ...mixed_properties_and_additional_properties_class.rb | 10 ++++++++--
 .../ruby/lib/petstore/models/model200_response.rb      | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/model_return.rb  | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/name.rb   | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/number_only.rb   | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/order.rb  | 10 ++++++++--
 .../ruby/lib/petstore/models/outer_composite.rb        | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/outer_enum.rb    |  8 ++++++++
 .../client/petstore/ruby/lib/petstore/models/pet.rb    | 10 ++++++++--
 .../ruby/lib/petstore/models/read_only_first.rb        | 10 ++++++++--
 .../ruby/lib/petstore/models/special_model_name.rb     | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/tag.rb    | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/user.rb   | 10 ++++++++--
 35 files changed, 273 insertions(+), 67 deletions(-)

diff --git a/samples/client/petstore/ruby/lib/petstore/api_client.rb b/samples/client/petstore/ruby/lib/petstore/api_client.rb
index 2e38bc099f7d..85df1d28fd98 100644
--- a/samples/client/petstore/ruby/lib/petstore/api_client.rb
+++ b/samples/client/petstore/ruby/lib/petstore/api_client.rb
@@ -210,9 +210,7 @@ def convert_to_type(data, return_type)
         end
       else
         # models, e.g. Pet
-        Petstore.const_get(return_type).new.tap do |model|
-          model.build_from_hash data
-        end
+        Petstore.const_get(return_type).build_from_hash(data)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/additional_properties_class.rb b/samples/client/petstore/ruby/lib/petstore/models/additional_properties_class.rb
index 6b716e0fa3d4..878be7f81251 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/additional_properties_class.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/additional_properties_class.rb
@@ -89,6 +89,13 @@ def hash
       [map_property, map_of_map_property].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -146,8 +153,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/animal.rb b/samples/client/petstore/ruby/lib/petstore/models/animal.rb
index b82f4d6de053..31eaba3f8b39 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/animal.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/animal.rb
@@ -97,6 +97,13 @@ def hash
       [class_name, color].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -154,8 +161,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/api_response.rb b/samples/client/petstore/ruby/lib/petstore/models/api_response.rb
index 7b3e9eeae239..91aff68e5d8a 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/api_response.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/api_response.rb
@@ -94,6 +94,13 @@ def hash
       [code, type, message].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -151,8 +158,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/array_of_array_of_number_only.rb b/samples/client/petstore/ruby/lib/petstore/models/array_of_array_of_number_only.rb
index 75605c56bd5e..aa8c2d34bed8 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/array_of_array_of_number_only.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/array_of_array_of_number_only.rb
@@ -78,6 +78,13 @@ def hash
       [array_array_number].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -135,8 +142,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/array_of_number_only.rb b/samples/client/petstore/ruby/lib/petstore/models/array_of_number_only.rb
index 22f04b5b9251..276eba10bbf5 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/array_of_number_only.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/array_of_number_only.rb
@@ -78,6 +78,13 @@ def hash
       [array_number].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -135,8 +142,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/array_test.rb b/samples/client/petstore/ruby/lib/petstore/models/array_test.rb
index e37a54fdecc5..5da3bda45b38 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/array_test.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/array_test.rb
@@ -100,6 +100,13 @@ def hash
       [array_of_string, array_array_of_integer, array_array_of_model].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -157,8 +164,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/capitalization.rb b/samples/client/petstore/ruby/lib/petstore/models/capitalization.rb
index 9be52e89ff07..59085dadb981 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/capitalization.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/capitalization.rb
@@ -122,6 +122,13 @@ def hash
       [small_camel, capital_camel, small_snake, capital_snake, sca_eth_flow_points, att_name].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -179,8 +186,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/cat.rb b/samples/client/petstore/ruby/lib/petstore/models/cat.rb
index 300da74d3613..4c42f0755ad5 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/cat.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/cat.rb
@@ -111,6 +111,13 @@ def hash
       [declawed, class_name, color].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -169,8 +176,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/category.rb b/samples/client/petstore/ruby/lib/petstore/models/category.rb
index a00d2e34927d..dd6dd978269a 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/category.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/category.rb
@@ -92,6 +92,13 @@ def hash
       [id, name].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -149,8 +156,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/class_model.rb b/samples/client/petstore/ruby/lib/petstore/models/class_model.rb
index 013dfc01e5be..0f70d9ef08d7 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/class_model.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/class_model.rb
@@ -77,6 +77,13 @@ def hash
       [_class].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -134,8 +141,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/client.rb b/samples/client/petstore/ruby/lib/petstore/models/client.rb
index e3e84e1d86cf..5a248bc0c3e1 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/client.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/client.rb
@@ -76,6 +76,13 @@ def hash
       [client].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -133,8 +140,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/dog.rb b/samples/client/petstore/ruby/lib/petstore/models/dog.rb
index ea62445687eb..de675a834df2 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/dog.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/dog.rb
@@ -111,6 +111,13 @@ def hash
       [breed, class_name, color].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -169,8 +176,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/enum_arrays.rb b/samples/client/petstore/ruby/lib/petstore/models/enum_arrays.rb
index d870963ab7e5..043911c09964 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/enum_arrays.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/enum_arrays.rb
@@ -121,6 +121,13 @@ def hash
       [just_symbol, array_enum].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -178,8 +185,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/enum_class.rb b/samples/client/petstore/ruby/lib/petstore/models/enum_class.rb
index a0b472f3c168..12060da1e83d 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/enum_class.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/enum_class.rb
@@ -19,6 +19,13 @@ class EnumClass
     EFG = '-efg'.freeze
     XYZ = '(xyz)'.freeze
 
+    # Builds the enum from string
+    # @param [String] The enum value in the form of the string
+    # @return [String] The enum value
+    def self.build_from_hash(value)
+      new.build_from_hash(value)
+    end
+
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
     # @return [String] The enum value
@@ -28,4 +35,5 @@ def build_from_hash(value)
       value
     end
   end
+
 end
diff --git a/samples/client/petstore/ruby/lib/petstore/models/enum_test.rb b/samples/client/petstore/ruby/lib/petstore/models/enum_test.rb
index b66bdd164727..54d62e17aec9 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/enum_test.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/enum_test.rb
@@ -187,6 +187,13 @@ def hash
       [enum_string, enum_string_required, enum_integer, enum_number, outer_enum].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -244,8 +251,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/file.rb b/samples/client/petstore/ruby/lib/petstore/models/file.rb
index 473eb78e06df..9d7eacc845dc 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/file.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/file.rb
@@ -78,6 +78,13 @@ def hash
       [source_uri].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -135,8 +142,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/file_schema_test_class.rb b/samples/client/petstore/ruby/lib/petstore/models/file_schema_test_class.rb
index 43619c4d00c4..dac348cdffab 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/file_schema_test_class.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/file_schema_test_class.rb
@@ -87,6 +87,13 @@ def hash
       [file, files].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -144,8 +151,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/format_test.rb b/samples/client/petstore/ruby/lib/petstore/models/format_test.rb
index 0d1bc02dddad..e129fa706803 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/format_test.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/format_test.rb
@@ -390,6 +390,13 @@ def hash
       [integer, int32, int64, number, float, double, string, byte, binary, date, date_time, uuid, password].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -447,8 +454,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/has_only_read_only.rb b/samples/client/petstore/ruby/lib/petstore/models/has_only_read_only.rb
index 272a53c53f2d..e4abd4939bac 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/has_only_read_only.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/has_only_read_only.rb
@@ -85,6 +85,13 @@ def hash
       [bar, foo].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -142,8 +149,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/list.rb b/samples/client/petstore/ruby/lib/petstore/models/list.rb
index d0399fb4bd40..9f3421caeb5f 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/list.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/list.rb
@@ -76,6 +76,13 @@ def hash
       [_123_list].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -133,8 +140,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/map_test.rb b/samples/client/petstore/ruby/lib/petstore/models/map_test.rb
index 02f17237f700..98e26cb4d729 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/map_test.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/map_test.rb
@@ -133,6 +133,13 @@ def hash
       [map_map_of_string, map_of_enum_string, direct_map, indirect_map].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -190,8 +197,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/mixed_properties_and_additional_properties_class.rb b/samples/client/petstore/ruby/lib/petstore/models/mixed_properties_and_additional_properties_class.rb
index 35e069618c0e..fe3efa3e57dc 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/mixed_properties_and_additional_properties_class.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/mixed_properties_and_additional_properties_class.rb
@@ -96,6 +96,13 @@ def hash
       [uuid, date_time, map].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -153,8 +160,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/model200_response.rb b/samples/client/petstore/ruby/lib/petstore/models/model200_response.rb
index b1321c3ffae8..3a5985006c92 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/model200_response.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/model200_response.rb
@@ -86,6 +86,13 @@ def hash
       [name, _class].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -143,8 +150,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/model_return.rb b/samples/client/petstore/ruby/lib/petstore/models/model_return.rb
index d573b9ea9af9..9efe48d4fc3b 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/model_return.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/model_return.rb
@@ -77,6 +77,13 @@ def hash
       [_return].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -134,8 +141,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/name.rb b/samples/client/petstore/ruby/lib/petstore/models/name.rb
index 98aab8f78f41..345adf28ff1a 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/name.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/name.rb
@@ -109,6 +109,13 @@ def hash
       [name, snake_case, property, _123_number].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -166,8 +173,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/number_only.rb b/samples/client/petstore/ruby/lib/petstore/models/number_only.rb
index 1e7e626cd17e..7a064ce652fd 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/number_only.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/number_only.rb
@@ -76,6 +76,13 @@ def hash
       [just_number].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -133,8 +140,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/order.rb b/samples/client/petstore/ruby/lib/petstore/models/order.rb
index 11f9f4c3710c..e15cb6eaba68 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/order.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/order.rb
@@ -158,6 +158,13 @@ def hash
       [id, pet_id, quantity, ship_date, status, complete].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -215,8 +222,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/outer_composite.rb b/samples/client/petstore/ruby/lib/petstore/models/outer_composite.rb
index 230bc670767f..bcc41d2e5fd2 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/outer_composite.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/outer_composite.rb
@@ -94,6 +94,13 @@ def hash
       [my_number, my_string, my_boolean].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -151,8 +158,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/outer_enum.rb b/samples/client/petstore/ruby/lib/petstore/models/outer_enum.rb
index cec4c0ef8307..4338180c37b8 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/outer_enum.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/outer_enum.rb
@@ -19,6 +19,13 @@ class OuterEnum
     APPROVED = 'approved'.freeze
     DELIVERED = 'delivered'.freeze
 
+    # Builds the enum from string
+    # @param [String] The enum value in the form of the string
+    # @return [String] The enum value
+    def self.build_from_hash(value)
+      new.build_from_hash(value)
+    end
+
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
     # @return [String] The enum value
@@ -28,4 +35,5 @@ def build_from_hash(value)
       value
     end
   end
+
 end
diff --git a/samples/client/petstore/ruby/lib/petstore/models/pet.rb b/samples/client/petstore/ruby/lib/petstore/models/pet.rb
index 183f2d9b7ba2..df356088bf21 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/pet.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/pet.rb
@@ -170,6 +170,13 @@ def hash
       [id, category, name, photo_urls, tags, status].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -227,8 +234,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/read_only_first.rb b/samples/client/petstore/ruby/lib/petstore/models/read_only_first.rb
index a181f9a0a9ed..846c6dffc2c1 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/read_only_first.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/read_only_first.rb
@@ -85,6 +85,13 @@ def hash
       [bar, baz].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -142,8 +149,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/special_model_name.rb b/samples/client/petstore/ruby/lib/petstore/models/special_model_name.rb
index 2ed4335bef2e..2309bb09f295 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/special_model_name.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/special_model_name.rb
@@ -76,6 +76,13 @@ def hash
       [special_property_name].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -133,8 +140,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/tag.rb b/samples/client/petstore/ruby/lib/petstore/models/tag.rb
index e160a1de2758..68c8955a56c9 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/tag.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/tag.rb
@@ -85,6 +85,13 @@ def hash
       [id, name].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -142,8 +149,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/client/petstore/ruby/lib/petstore/models/user.rb b/samples/client/petstore/ruby/lib/petstore/models/user.rb
index 2c2e0402db59..879aa6299d51 100644
--- a/samples/client/petstore/ruby/lib/petstore/models/user.rb
+++ b/samples/client/petstore/ruby/lib/petstore/models/user.rb
@@ -140,6 +140,13 @@ def hash
       [id, username, first_name, last_name, email, password, phone, user_status].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -197,8 +204,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 

From b66ea1e1d14a280619138efeb8e04fc55b79e3c7 Mon Sep 17 00:00:00 2001
From: meganemura <meganemura@users.noreply.github.com>
Date: Fri, 14 Dec 2018 19:05:10 +0900
Subject: [PATCH 4/4] Update sample for openapi3 ruby-client

---
 .../client/petstore/ruby/lib/petstore/api_client.rb    |  4 +---
 .../lib/petstore/models/additional_properties_class.rb | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/animal.rb | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/api_response.rb  | 10 ++++++++--
 .../petstore/models/array_of_array_of_number_only.rb   | 10 ++++++++--
 .../ruby/lib/petstore/models/array_of_number_only.rb   | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/array_test.rb    | 10 ++++++++--
 .../ruby/lib/petstore/models/capitalization.rb         | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/cat.rb    | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/category.rb      | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/class_model.rb   | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/client.rb | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/dog.rb    | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/enum_arrays.rb   | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/enum_class.rb    |  8 ++++++++
 .../petstore/ruby/lib/petstore/models/enum_test.rb     | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/file.rb   | 10 ++++++++--
 .../ruby/lib/petstore/models/file_schema_test_class.rb | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/foo.rb    | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/format_test.rb   | 10 ++++++++--
 .../ruby/lib/petstore/models/has_only_read_only.rb     | 10 ++++++++--
 .../lib/petstore/models/inline_response_default.rb     | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/list.rb   | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/map_test.rb      | 10 ++++++++--
 ...mixed_properties_and_additional_properties_class.rb | 10 ++++++++--
 .../ruby/lib/petstore/models/model200_response.rb      | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/model_return.rb  | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/name.rb   | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/number_only.rb   | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/order.rb  | 10 ++++++++--
 .../ruby/lib/petstore/models/outer_composite.rb        | 10 ++++++++--
 .../petstore/ruby/lib/petstore/models/outer_enum.rb    |  8 ++++++++
 .../client/petstore/ruby/lib/petstore/models/pet.rb    | 10 ++++++++--
 .../ruby/lib/petstore/models/read_only_first.rb        | 10 ++++++++--
 .../ruby/lib/petstore/models/special_model_name.rb     | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/tag.rb    | 10 ++++++++--
 .../client/petstore/ruby/lib/petstore/models/user.rb   | 10 ++++++++--
 37 files changed, 289 insertions(+), 71 deletions(-)

diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/api_client.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/api_client.rb
index 2e38bc099f7d..85df1d28fd98 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/api_client.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/api_client.rb
@@ -210,9 +210,7 @@ def convert_to_type(data, return_type)
         end
       else
         # models, e.g. Pet
-        Petstore.const_get(return_type).new.tap do |model|
-          model.build_from_hash data
-        end
+        Petstore.const_get(return_type).build_from_hash(data)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/additional_properties_class.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/additional_properties_class.rb
index 6b716e0fa3d4..878be7f81251 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/additional_properties_class.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/additional_properties_class.rb
@@ -89,6 +89,13 @@ def hash
       [map_property, map_of_map_property].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -146,8 +153,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/animal.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/animal.rb
index b82f4d6de053..31eaba3f8b39 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/animal.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/animal.rb
@@ -97,6 +97,13 @@ def hash
       [class_name, color].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -154,8 +161,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/api_response.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/api_response.rb
index 7b3e9eeae239..91aff68e5d8a 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/api_response.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/api_response.rb
@@ -94,6 +94,13 @@ def hash
       [code, type, message].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -151,8 +158,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_of_array_of_number_only.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_of_array_of_number_only.rb
index 75605c56bd5e..aa8c2d34bed8 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_of_array_of_number_only.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_of_array_of_number_only.rb
@@ -78,6 +78,13 @@ def hash
       [array_array_number].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -135,8 +142,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_of_number_only.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_of_number_only.rb
index 22f04b5b9251..276eba10bbf5 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_of_number_only.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_of_number_only.rb
@@ -78,6 +78,13 @@ def hash
       [array_number].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -135,8 +142,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_test.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_test.rb
index e37a54fdecc5..5da3bda45b38 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_test.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/array_test.rb
@@ -100,6 +100,13 @@ def hash
       [array_of_string, array_array_of_integer, array_array_of_model].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -157,8 +164,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/capitalization.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/capitalization.rb
index 9be52e89ff07..59085dadb981 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/capitalization.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/capitalization.rb
@@ -122,6 +122,13 @@ def hash
       [small_camel, capital_camel, small_snake, capital_snake, sca_eth_flow_points, att_name].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -179,8 +186,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/cat.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/cat.rb
index 300da74d3613..4c42f0755ad5 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/cat.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/cat.rb
@@ -111,6 +111,13 @@ def hash
       [declawed, class_name, color].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -169,8 +176,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/category.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/category.rb
index a00d2e34927d..dd6dd978269a 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/category.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/category.rb
@@ -92,6 +92,13 @@ def hash
       [id, name].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -149,8 +156,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/class_model.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/class_model.rb
index 013dfc01e5be..0f70d9ef08d7 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/class_model.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/class_model.rb
@@ -77,6 +77,13 @@ def hash
       [_class].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -134,8 +141,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/client.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/client.rb
index e3e84e1d86cf..5a248bc0c3e1 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/client.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/client.rb
@@ -76,6 +76,13 @@ def hash
       [client].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -133,8 +140,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/dog.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/dog.rb
index ea62445687eb..de675a834df2 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/dog.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/dog.rb
@@ -111,6 +111,13 @@ def hash
       [breed, class_name, color].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -169,8 +176,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_arrays.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_arrays.rb
index d870963ab7e5..043911c09964 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_arrays.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_arrays.rb
@@ -121,6 +121,13 @@ def hash
       [just_symbol, array_enum].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -178,8 +185,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_class.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_class.rb
index a0b472f3c168..12060da1e83d 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_class.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_class.rb
@@ -19,6 +19,13 @@ class EnumClass
     EFG = '-efg'.freeze
     XYZ = '(xyz)'.freeze
 
+    # Builds the enum from string
+    # @param [String] The enum value in the form of the string
+    # @return [String] The enum value
+    def self.build_from_hash(value)
+      new.build_from_hash(value)
+    end
+
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
     # @return [String] The enum value
@@ -28,4 +35,5 @@ def build_from_hash(value)
       value
     end
   end
+
 end
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_test.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_test.rb
index b66bdd164727..54d62e17aec9 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_test.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/enum_test.rb
@@ -187,6 +187,13 @@ def hash
       [enum_string, enum_string_required, enum_integer, enum_number, outer_enum].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -244,8 +251,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/file.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/file.rb
index 473eb78e06df..9d7eacc845dc 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/file.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/file.rb
@@ -78,6 +78,13 @@ def hash
       [source_uri].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -135,8 +142,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/file_schema_test_class.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/file_schema_test_class.rb
index 43619c4d00c4..dac348cdffab 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/file_schema_test_class.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/file_schema_test_class.rb
@@ -87,6 +87,13 @@ def hash
       [file, files].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -144,8 +151,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/foo.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/foo.rb
index 1d7224109238..6c344358b8fd 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/foo.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/foo.rb
@@ -78,6 +78,13 @@ def hash
       [bar].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -135,8 +142,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/format_test.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/format_test.rb
index a1bab83fc893..90890cbd079e 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/format_test.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/format_test.rb
@@ -421,6 +421,13 @@ def hash
       [integer, int32, int64, number, float, double, string, byte, binary, date, date_time, uuid, password, pattern_with_digits, pattern_with_digits_and_delimiter].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -478,8 +485,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/has_only_read_only.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/has_only_read_only.rb
index 272a53c53f2d..e4abd4939bac 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/has_only_read_only.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/has_only_read_only.rb
@@ -85,6 +85,13 @@ def hash
       [bar, foo].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -142,8 +149,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/inline_response_default.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/inline_response_default.rb
index 5d4ac11be7e6..56bd9d09388c 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/inline_response_default.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/inline_response_default.rb
@@ -76,6 +76,13 @@ def hash
       [string].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -133,8 +140,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/list.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/list.rb
index d0399fb4bd40..9f3421caeb5f 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/list.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/list.rb
@@ -76,6 +76,13 @@ def hash
       [_123_list].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -133,8 +140,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/map_test.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/map_test.rb
index 02f17237f700..98e26cb4d729 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/map_test.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/map_test.rb
@@ -133,6 +133,13 @@ def hash
       [map_map_of_string, map_of_enum_string, direct_map, indirect_map].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -190,8 +197,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/mixed_properties_and_additional_properties_class.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/mixed_properties_and_additional_properties_class.rb
index 35e069618c0e..fe3efa3e57dc 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/mixed_properties_and_additional_properties_class.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/mixed_properties_and_additional_properties_class.rb
@@ -96,6 +96,13 @@ def hash
       [uuid, date_time, map].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -153,8 +160,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/model200_response.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/model200_response.rb
index b1321c3ffae8..3a5985006c92 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/model200_response.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/model200_response.rb
@@ -86,6 +86,13 @@ def hash
       [name, _class].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -143,8 +150,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/model_return.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/model_return.rb
index d573b9ea9af9..9efe48d4fc3b 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/model_return.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/model_return.rb
@@ -77,6 +77,13 @@ def hash
       [_return].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -134,8 +141,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/name.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/name.rb
index 98aab8f78f41..345adf28ff1a 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/name.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/name.rb
@@ -109,6 +109,13 @@ def hash
       [name, snake_case, property, _123_number].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -166,8 +173,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/number_only.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/number_only.rb
index 1e7e626cd17e..7a064ce652fd 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/number_only.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/number_only.rb
@@ -76,6 +76,13 @@ def hash
       [just_number].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -133,8 +140,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/order.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/order.rb
index 11f9f4c3710c..e15cb6eaba68 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/order.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/order.rb
@@ -158,6 +158,13 @@ def hash
       [id, pet_id, quantity, ship_date, status, complete].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -215,8 +222,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/outer_composite.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/outer_composite.rb
index 230bc670767f..bcc41d2e5fd2 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/outer_composite.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/outer_composite.rb
@@ -94,6 +94,13 @@ def hash
       [my_number, my_string, my_boolean].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -151,8 +158,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/outer_enum.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/outer_enum.rb
index cec4c0ef8307..4338180c37b8 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/outer_enum.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/outer_enum.rb
@@ -19,6 +19,13 @@ class OuterEnum
     APPROVED = 'approved'.freeze
     DELIVERED = 'delivered'.freeze
 
+    # Builds the enum from string
+    # @param [String] The enum value in the form of the string
+    # @return [String] The enum value
+    def self.build_from_hash(value)
+      new.build_from_hash(value)
+    end
+
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
     # @return [String] The enum value
@@ -28,4 +35,5 @@ def build_from_hash(value)
       value
     end
   end
+
 end
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/pet.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/pet.rb
index 183f2d9b7ba2..df356088bf21 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/pet.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/pet.rb
@@ -170,6 +170,13 @@ def hash
       [id, category, name, photo_urls, tags, status].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -227,8 +234,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/read_only_first.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/read_only_first.rb
index a181f9a0a9ed..846c6dffc2c1 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/read_only_first.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/read_only_first.rb
@@ -85,6 +85,13 @@ def hash
       [bar, baz].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -142,8 +149,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/special_model_name.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/special_model_name.rb
index 2ed4335bef2e..2309bb09f295 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/special_model_name.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/special_model_name.rb
@@ -76,6 +76,13 @@ def hash
       [special_property_name].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -133,8 +140,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/tag.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/tag.rb
index e160a1de2758..68c8955a56c9 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/tag.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/tag.rb
@@ -85,6 +85,13 @@ def hash
       [id, name].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -142,8 +149,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end
 
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/models/user.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/models/user.rb
index 2c2e0402db59..879aa6299d51 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/models/user.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/models/user.rb
@@ -140,6 +140,13 @@ def hash
       [id, username, first_name, last_name, email, password, phone, user_status].hash
     end
 
+    # Builds the object from hash
+    # @param [Hash] attributes Model attributes in the form of hash
+    # @return [Object] Returns the model itself
+    def self.build_from_hash(attributes)
+      new.build_from_hash(attributes)
+    end
+
     # Builds the object from hash
     # @param [Hash] attributes Model attributes in the form of hash
     # @return [Object] Returns the model itself
@@ -197,8 +204,7 @@ def _deserialize(type, value)
           end
         end
       else # model
-        temp_model = Petstore.const_get(type).new
-        temp_model.build_from_hash(value)
+        Petstore.const_get(type).build_from_hash(value)
       end
     end