[Python] Bug Fix - model_generic templates to have valid imports for polymorphism (#20273)

* fix model_generic python templates to have valid imports for polymorphism

* update samples

* update samples

---------

Co-authored-by: yugi <[email protected]>

Author: YousefHaggy

modules/openapi-generator/src/main/resources/python-pydantic-v1/model_generic.mustache

@@ -17,7 +17,7 @@ from typing import TYPE_CHECKING
 from importlib import import_module
 if TYPE_CHECKING:
 {{#mappedModels}}
-    from {{packageName}}.models.{{model.classVarName}} import {{modelName}}
+    from {{packageName}}.models.{{model.classFilename}} import {{modelName}}
 {{/mappedModels}}
 
 {{/discriminator}}
@@ -238,7 +238,7 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
         object_type = cls.get_discriminator_value(obj)
         {{#mappedModels}}
         if object_type ==  '{{{modelName}}}':
-            return import_module("{{packageName}}.models.{{model.classVarName}}").{{modelName}}.from_dict(obj)
+            return import_module("{{packageName}}.models.{{model.classFilename}}").{{modelName}}.from_dict(obj)
         {{/mappedModels}}
         raise ValueError("{{{classname}}} failed to lookup discriminator value from " +
                             json.dumps(obj) + ". Discriminator property name: " + cls.__discriminator_property_name +

modules/openapi-generator/src/main/resources/python/model_generic.mustache

@@ -18,7 +18,7 @@ from typing_extensions import Self
 from typing import TYPE_CHECKING
 if TYPE_CHECKING:
 {{#mappedModels}}
-    from {{packageName}}.models.{{model.classVarName}} import {{modelName}}
+    from {{packageName}}.models.{{model.classFilename}} import {{modelName}}
 {{/mappedModels}}
 
 {{/discriminator}}
@@ -261,7 +261,7 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
         object_type = cls.get_discriminator_value(obj)
         {{#mappedModels}}
         if object_type ==  '{{{modelName}}}':
-            return import_module("{{packageName}}.models.{{model.classVarName}}").{{modelName}}.from_dict(obj)
+            return import_module("{{packageName}}.models.{{model.classFilename}}").{{modelName}}.from_dict(obj)
         {{/mappedModels}}
 
         raise ValueError("{{{classname}}} failed to lookup discriminator value from " +

modules/openapi-generator/src/test/resources/3_0/python/petstore-with-fake-endpoints-models-for-testing.yaml

@@ -1950,6 +1950,13 @@ components:
       properties:
         _class:
           type: string
+    Hunting__Dog:
+      allOf:
+        - $ref: '#/components/schemas/Creature'
+        - type: object
+          properties:
+            isTrained:
+              type: boolean
     Dog:
       allOf:
         - $ref: '#/components/schemas/Animal'

samples/openapi3/client/petstore/python-aiohttp/.openapi-generator/FILES

@@ -53,6 +53,7 @@ docs/FooGetDefaultResponse.md
 docs/FormatTest.md
 docs/HasOnlyReadOnly.md
 docs/HealthCheckResult.md
+docs/HuntingDog.md
 docs/ImportTestDatetimeApi.md
 docs/Info.md
 docs/InnerDictWithProperty.md
@@ -178,6 +179,7 @@ petstore_api/models/foo_get_default_response.py
 petstore_api/models/format_test.py
 petstore_api/models/has_only_read_only.py
 petstore_api/models/health_check_result.py
+petstore_api/models/hunting_dog.py
 petstore_api/models/info.py
 petstore_api/models/inner_dict_with_property.py
 petstore_api/models/input_all_of.py

samples/openapi3/client/petstore/python-aiohttp/README.md

@@ -197,6 +197,7 @@ Class | Method | HTTP request | Description
  - [FormatTest](docs/FormatTest.md)
  - [HasOnlyReadOnly](docs/HasOnlyReadOnly.md)
  - [HealthCheckResult](docs/HealthCheckResult.md)
+ - [HuntingDog](docs/HuntingDog.md)
  - [Info](docs/Info.md)
  - [InnerDictWithProperty](docs/InnerDictWithProperty.md)
  - [InputAllOf](docs/InputAllOf.md)

samples/openapi3/client/petstore/python-aiohttp/docs/HuntingDog.md

@@ -0,0 +1,29 @@
+# HuntingDog
+
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**is_trained** | **bool** |  | [optional] 
+
+## Example
+
+```python
+from petstore_api.models.hunting_dog import HuntingDog
+
+# TODO update the JSON string below
+json = "{}"
+# create an instance of HuntingDog from a JSON string
+hunting_dog_instance = HuntingDog.from_json(json)
+# print the JSON string representation of the object
+print(HuntingDog.to_json())
+
+# convert the object into a dict
+hunting_dog_dict = hunting_dog_instance.to_dict()
+# create an instance of HuntingDog from a dict
+hunting_dog_from_dict = HuntingDog.from_dict(hunting_dog_dict)
+```
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+

samples/openapi3/client/petstore/python-aiohttp/petstore_api/__init__.py

@@ -85,6 +85,7 @@
 from petstore_api.models.format_test import FormatTest
 from petstore_api.models.has_only_read_only import HasOnlyReadOnly
 from petstore_api.models.health_check_result import HealthCheckResult
+from petstore_api.models.hunting_dog import HuntingDog
 from petstore_api.models.info import Info
 from petstore_api.models.inner_dict_with_property import InnerDictWithProperty
 from petstore_api.models.input_all_of import InputAllOf

samples/openapi3/client/petstore/python-aiohttp/petstore_api/models/__init__.py

@@ -60,6 +60,7 @@
 from petstore_api.models.format_test import FormatTest
 from petstore_api.models.has_only_read_only import HasOnlyReadOnly
 from petstore_api.models.health_check_result import HealthCheckResult
+from petstore_api.models.hunting_dog import HuntingDog
 from petstore_api.models.info import Info
 from petstore_api.models.inner_dict_with_property import InnerDictWithProperty
 from petstore_api.models.input_all_of import InputAllOf

samples/openapi3/client/petstore/python-aiohttp/petstore_api/models/creature.py

@@ -17,12 +17,17 @@
 import re  # noqa: F401
 import json
 
+from importlib import import_module
 from pydantic import BaseModel, ConfigDict, StrictStr
-from typing import Any, ClassVar, Dict, List
+from typing import Any, ClassVar, Dict, List, Union
 from petstore_api.models.creature_info import CreatureInfo
 from typing import Optional, Set
 from typing_extensions import Self
 
+from typing import TYPE_CHECKING
+if TYPE_CHECKING:
+    from petstore_api.models.hunting_dog import HuntingDog
+
 class Creature(BaseModel):
     """
     Creature
@@ -38,6 +43,23 @@ class Creature(BaseModel):
     )
 
 
+    # JSON field name that stores the object type
+    __discriminator_property_name: ClassVar[str] = 'type'
+
+    # discriminator mappings
+    __discriminator_value_class_map: ClassVar[Dict[str, str]] = {
+        'Hunting__Dog': 'HuntingDog'
+    }
+
+    @classmethod
+    def get_discriminator_value(cls, obj: Dict[str, Any]) -> Optional[str]:
+        """Returns the discriminator value (object type) of the data"""
+        discriminator_value = obj[cls.__discriminator_property_name]
+        if discriminator_value:
+            return cls.__discriminator_value_class_map.get(discriminator_value)
+        else:
+            return None
+
     def to_str(self) -> str:
         """Returns the string representation of the model using alias"""
         return pprint.pformat(self.model_dump(by_alias=True))
@@ -48,7 +70,7 @@ def to_json(self) -> str:
         return json.dumps(self.to_dict())
 
     @classmethod
-    def from_json(cls, json_str: str) -> Optional[Self]:
+    def from_json(cls, json_str: str) -> Optional[Union[HuntingDog]]:
         """Create an instance of Creature from a JSON string"""
         return cls.from_dict(json.loads(json_str))
 
@@ -76,18 +98,15 @@ def to_dict(self) -> Dict[str, Any]:
         return _dict
 
     @classmethod
-    def from_dict(cls, obj: Optional[Dict[str, Any]]) -> Optional[Self]:
+    def from_dict(cls, obj: Dict[str, Any]) -> Optional[Union[HuntingDog]]:
         """Create an instance of Creature from a dict"""
-        if obj is None:
-            return None
-
-        if not isinstance(obj, dict):
-            return cls.model_validate(obj)
-
-        _obj = cls.model_validate({
-            "info": CreatureInfo.from_dict(obj["info"]) if obj.get("info") is not None else None,
-            "type": obj.get("type")
-        })
-        return _obj
+        # look up the object type based on discriminator mapping
+        object_type = cls.get_discriminator_value(obj)
+        if object_type ==  'HuntingDog':
+            return import_module("petstore_api.models.hunting_dog").HuntingDog.from_dict(obj)
+
+        raise ValueError("Creature failed to lookup discriminator value from " +
+                            json.dumps(obj) + ". Discriminator property name: " + cls.__discriminator_property_name +
+                            ", mapping: " + json.dumps(cls.__discriminator_value_class_map))
 
 

samples/openapi3/client/petstore/python-aiohttp/petstore_api/models/hunting_dog.py

@@ -0,0 +1,94 @@
+# coding: utf-8
+
+"""
+    OpenAPI Petstore
+
+    This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by OpenAPI Generator (https://openapi-generator.tech)
+
+    Do not edit the class manually.
+"""  # noqa: E501
+
+
+from __future__ import annotations
+import pprint
+import re  # noqa: F401
+import json
+
+from pydantic import ConfigDict, Field, StrictBool
+from typing import Any, ClassVar, Dict, List, Optional
+from petstore_api.models.creature import Creature
+from petstore_api.models.creature_info import CreatureInfo
+from typing import Optional, Set
+from typing_extensions import Self
+
+class HuntingDog(Creature):
+    """
+    HuntingDog
+    """ # noqa: E501
+    is_trained: Optional[StrictBool] = Field(default=None, alias="isTrained")
+    __properties: ClassVar[List[str]] = ["info", "type", "isTrained"]
+
+    model_config = ConfigDict(
+        populate_by_name=True,
+        validate_assignment=True,
+        protected_namespaces=(),
+    )
+
+
+    def to_str(self) -> str:
+        """Returns the string representation of the model using alias"""
+        return pprint.pformat(self.model_dump(by_alias=True))
+
+    def to_json(self) -> str:
+        """Returns the JSON representation of the model using alias"""
+        # TODO: pydantic v2: use .model_dump_json(by_alias=True, exclude_unset=True) instead
+        return json.dumps(self.to_dict())
+
+    @classmethod
+    def from_json(cls, json_str: str) -> Optional[Self]:
+        """Create an instance of HuntingDog from a JSON string"""
+        return cls.from_dict(json.loads(json_str))
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Return the dictionary representation of the model using alias.
+
+        This has the following differences from calling pydantic's
+        `self.model_dump(by_alias=True)`:
+
+        * `None` is only added to the output dict for nullable fields that
+          were set at model initialization. Other fields with value `None`
+          are ignored.
+        """
+        excluded_fields: Set[str] = set([
+        ])
+
+        _dict = self.model_dump(
+            by_alias=True,
+            exclude=excluded_fields,
+            exclude_none=True,
+        )
+        # override the default output from pydantic by calling `to_dict()` of info
+        if self.info:
+            _dict['info'] = self.info.to_dict()
+        return _dict
+
+    @classmethod
+    def from_dict(cls, obj: Optional[Dict[str, Any]]) -> Optional[Self]:
+        """Create an instance of HuntingDog from a dict"""
+        if obj is None:
+            return None
+
+        if not isinstance(obj, dict):
+            return cls.model_validate(obj)
+
+        _obj = cls.model_validate({
+            "info": CreatureInfo.from_dict(obj["info"]) if obj.get("info") is not None else None,
+            "type": obj.get("type"),
+            "isTrained": obj.get("isTrained")
+        })
+        return _obj
+
+