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python(pydantic): Use validate_by_name config; populate_by_name will be deprecated #22931

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python(pydantic): Use validate_by_name config; populate_by_name will be deprecated #22931

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46b56d0
modules
timonrieger Feb 9, 2026
e3df5ff
pydantic bump
timonrieger Feb 9, 2026
5918e69
samples
timonrieger Feb 9, 2026
6460f34
revert for fastapi generator and apply pydantic constrain everywhere
timonrieger Feb 12, 2026
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2 changes: 1 addition & 1 deletion modules/openapi-generator/src/main/resources/python/README_onlypackage.mustache
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Expand Up @@ -39,7 +39,7 @@ To be able to use it, you will need these dependencies in your own package that
* pem >= 19.3.0
* pycryptodome >= 3.9.0
{{/hasHttpSignatureMethods}}
* pydantic >= 2
* pydantic >= 2.11
* typing-extensions >= 4.7.1

## Getting Started
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3 changes: 2 additions & 1 deletion modules/openapi-generator/src/main/resources/python/model_generic.mustache
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Expand Up @@ -94,7 +94,8 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
{{/vars}}

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
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4 changes: 2 additions & 2 deletions modules/openapi-generator/src/main/resources/python/pyproject.mustache
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Expand Up @@ -51,7 +51,7 @@ tornado = ">=4.2, <5"
pem = ">= 19.3.0"
pycryptodome = ">= 3.9.0"
{{/hasHttpSignatureMethods}}
pydantic = ">= 2"
pydantic = ">= 2.11"
typing-extensions = ">= 4.7.1"
{{#lazyImports}}
lazy-imports = ">= 1, < 2"
Expand Down Expand Up @@ -79,7 +79,7 @@ dependencies = [
"pem (>=19.3.0)",
"pycryptodome (>=3.9.0)",
{{/hasHttpSignatureMethods}}
"pydantic (>=2)",
"pydantic (>=2.11)",
"typing-extensions (>=4.7.1)",
{{#lazyImports}}
"lazy-imports (>=1,<2)"
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2 changes: 1 addition & 1 deletion modules/openapi-generator/src/main/resources/python/requirements.mustache
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ tornado = ">= 4.2, < 5"
pem >= 19.3.0
pycryptodome >= 3.9.0
{{/hasHttpSignatureMethods}}
pydantic >= 2
pydantic >= 2.11
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@cubic-dev-ai cubic-dev-ai bot Feb 12, 2026 •
edited
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P2: Dependency version mismatch: requirements.mustache now enforces pydantic >=2.11, but pyproject.mustache (non-poetry1 dependencies) still allows pydantic >=2. This can generate projects that install pydantic <2.11, inconsistent with the new validate_by_name requirement.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At modules/openapi-generator/src/main/resources/python/requirements.mustache, line 19:

<comment>Dependency version mismatch: requirements.mustache now enforces pydantic >=2.11, but pyproject.mustache (non-poetry1 dependencies) still allows pydantic >=2. This can generate projects that install pydantic <2.11, inconsistent with the new validate_by_name requirement.</comment>

<file context>
@@ -16,7 +16,7 @@ tornado = ">= 4.2, < 5"
 pycryptodome >= 3.9.0
 {{/hasHttpSignatureMethods}}
-pydantic >= 2
+pydantic >= 2.11
 typing-extensions >= 4.7.1
 {{#lazyImports}}
</file context>
Fix with Cubic

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@wing328 wing328 Feb 12, 2026

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@timonrieger can you please take a look at this feedback, which seems valid to me?

typing-extensions >= 4.7.1
{{#lazyImports}}
lazy-imports >= 1, < 2
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2 changes: 1 addition & 1 deletion modules/openapi-generator/src/main/resources/python/setup.mustache
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Expand Up @@ -33,7 +33,7 @@ REQUIRES = [
"pem >= 19.3.0",
"pycryptodome >= 3.9.0",
{{/hasHttpSignatureMethods}}
"pydantic >= 2",
"pydantic >= 2.11",
"typing-extensions >= 4.7.1",
{{#lazyImports}}
"lazy-imports >= 1, < 2",
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3 changes: 2 additions & 1 deletion ...nt/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/models/bird.py
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Expand Up @@ -32,7 +32,8 @@ class Bird(BaseModel):
__properties: ClassVar[List[str]] = ["size", "color"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
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3 changes: 2 additions & 1 deletion ...cho_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/models/category.py
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Expand Up @@ -32,7 +32,8 @@ class Category(BaseModel):
__properties: ClassVar[List[str]] = ["id", "name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
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3 changes: 2 additions & 1 deletion ...o_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/models/data_query.py
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Expand Up @@ -35,7 +35,8 @@ class DataQuery(Query):
__properties: ClassVar[List[str]] = ["id", "outcomes", "suffix", "text", "date"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
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3 changes: 2 additions & 1 deletion ...pi/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/models/default_value.py
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Expand Up @@ -50,7 +50,8 @@ def array_string_enum_default_validate_enum(cls, value):
return value

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
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3 changes: 2 additions & 1 deletion ...-disallowAdditionalPropertiesIfNotPresent/openapi_client/models/number_properties_only.py
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Expand Up @@ -34,7 +34,8 @@ class NumberPropertiesOnly(BaseModel):
__properties: ClassVar[List[str]] = ["number", "float", "double"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
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3 changes: 2 additions & 1 deletion ...ent/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/models/pet.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,8 @@ def status_validate_enum(cls, value):
return value

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
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@cubic-dev-ai cubic-dev-ai bot Feb 12, 2026 •
edited
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P2: New validate_by_name/validate_by_alias config requires Pydantic 2.11+, but pyproject.toml still allows pydantic>=2, so users can install 2.10 and hit runtime errors when importing this model.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/models/pet.py, line 51:

<comment>New `validate_by_name`/`validate_by_alias` config requires Pydantic 2.11+, but `pyproject.toml` still allows `pydantic>=2`, so users can install 2.10 and hit runtime errors when importing this model.</comment>

<file context>
@@ -48,7 +48,8 @@ def status_validate_enum(cls, value):
 
     model_config = ConfigDict(
-        populate_by_name=True,
+        validate_by_name=True,
+        validate_by_alias=True,
         validate_assignment=True,
</file context>
Fix with Cubic

validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion ...t/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/models/query.py
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Expand Up @@ -43,7 +43,8 @@ def outcomes_validate_enum(cls, value):
return value

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion ...ent/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/models/tag.py
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Expand Up @@ -32,7 +32,8 @@ class Tag(BaseModel):
__properties: ClassVar[List[str]] = ["id", "name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion ...PropertiesIfNotPresent/openapi_client/models/test_form_object_multipart_request_marker.py
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Expand Up @@ -31,7 +31,8 @@ class TestFormObjectMultipartRequestMarker(BaseModel):
__properties: ClassVar[List[str]] = ["name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
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3 changes: 2 additions & 1 deletion .../models/test_query_style_deep_object_explode_true_object_all_of_query_object_parameter.py
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Expand Up @@ -34,7 +34,8 @@ class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter(BaseMod
__properties: ClassVar[List[str]] = ["size", "color", "id", "name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion ...i_client/models/test_query_style_form_explode_true_array_string_query_object_parameter.py
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Expand Up @@ -31,7 +31,8 @@ class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter(BaseModel):
__properties: ClassVar[List[str]] = ["values"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
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2 changes: 1 addition & 1 deletion samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/pyproject.toml
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Expand Up @@ -13,7 +13,7 @@ requires-python = ">=3.9"
dependencies = [
"urllib3 (>=2.1.0,<3.0.0)",
"python-dateutil (>=2.8.2)",
"pydantic (>=2)",
"pydantic (>=2.11)",
"typing-extensions (>=4.7.1)",
]

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2 changes: 1 addition & 1 deletion samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/requirements.txt
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@@ -1,4 +1,4 @@
urllib3 >= 2.1.0, < 3.0.0
python_dateutil >= 2.8.2
pydantic >= 2
pydantic >= 2.11
typing-extensions >= 4.7.1
2 changes: 1 addition & 1 deletion samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/setup.py
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Expand Up @@ -27,7 +27,7 @@
REQUIRES = [
"urllib3 >= 2.1.0, < 3.0.0",
"python-dateutil >= 2.8.2",
"pydantic >= 2",
"pydantic >= 2.11",
"typing-extensions >= 4.7.1",
]

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3 changes: 2 additions & 1 deletion samples/client/echo_api/python/openapi_client/models/bird.py
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Expand Up @@ -32,7 +32,8 @@ class Bird(BaseModel):
__properties: ClassVar[List[str]] = ["size", "color"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion samples/client/echo_api/python/openapi_client/models/category.py
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,8 @@ class Category(BaseModel):
__properties: ClassVar[List[str]] = ["id", "name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
Copy link
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@cubic-dev-ai cubic-dev-ai bot Feb 12, 2026 •
edited
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P2: validate_by_name/validate_by_alias require Pydantic >=2.11, but the sample’s pyproject allows >=2 and poetry.lock pins 2.9.2. Poetry installs can use an older Pydantic that doesn’t support these config keys, breaking alias validation. Update the dependency constraints/lock to >=2.11.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/echo_api/python/openapi_client/models/category.py, line 35:

<comment>validate_by_name/validate_by_alias require Pydantic >=2.11, but the sample’s pyproject allows >=2 and poetry.lock pins 2.9.2. Poetry installs can use an older Pydantic that doesn’t support these config keys, breaking alias validation. Update the dependency constraints/lock to >=2.11.</comment>

<file context>
@@ -32,7 +32,8 @@ class Category(BaseModel):
 
     model_config = ConfigDict(
-        populate_by_name=True,
+        validate_by_name=True,
+        validate_by_alias=True,
         validate_assignment=True,
</file context>
Fix with Cubic

validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion samples/client/echo_api/python/openapi_client/models/data_query.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,8 @@ class DataQuery(Query):
__properties: ClassVar[List[str]] = ["id", "outcomes", "suffix", "text", "date"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion samples/client/echo_api/python/openapi_client/models/default_value.py
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,8 @@ def array_string_enum_default_validate_enum(cls, value):
return value

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion samples/client/echo_api/python/openapi_client/models/number_properties_only.py
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,8 @@ class NumberPropertiesOnly(BaseModel):
__properties: ClassVar[List[str]] = ["number", "float", "double"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion samples/client/echo_api/python/openapi_client/models/pet.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,8 @@ def status_validate_enum(cls, value):
return value

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion samples/client/echo_api/python/openapi_client/models/query.py
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,8 @@ def outcomes_validate_enum(cls, value):
return value

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion samples/client/echo_api/python/openapi_client/models/tag.py
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,8 @@ class Tag(BaseModel):
__properties: ClassVar[List[str]] = ["id", "name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion ...client/echo_api/python/openapi_client/models/test_form_object_multipart_request_marker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,8 @@ class TestFormObjectMultipartRequestMarker(BaseModel):
__properties: ClassVar[List[str]] = ["name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion .../models/test_query_style_deep_object_explode_true_object_all_of_query_object_parameter.py
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Expand Up @@ -34,7 +34,8 @@ class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter(BaseMod
__properties: ClassVar[List[str]] = ["size", "color", "id", "name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion ...i_client/models/test_query_style_form_explode_true_array_string_query_object_parameter.py
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Expand Up @@ -31,7 +31,8 @@ class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter(BaseModel):
__properties: ClassVar[List[str]] = ["values"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
2 changes: 1 addition & 1 deletion samples/client/echo_api/python/pyproject.toml
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Expand Up @@ -13,7 +13,7 @@ requires-python = ">=3.9"
dependencies = [
"urllib3 (>=2.1.0,<3.0.0)",
"python-dateutil (>=2.8.2)",
"pydantic (>=2)",
"pydantic (>=2.11)",
"typing-extensions (>=4.7.1)",
]

Expand Down
2 changes: 1 addition & 1 deletion samples/client/echo_api/python/requirements.txt
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@@ -1,4 +1,4 @@
urllib3 >= 2.1.0, < 3.0.0
python_dateutil >= 2.8.2
pydantic >= 2
pydantic >= 2.11
typing-extensions >= 4.7.1
2 changes: 1 addition & 1 deletion samples/client/echo_api/python/setup.py
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Expand Up @@ -27,7 +27,7 @@
REQUIRES = [
"urllib3 >= 2.1.0, < 3.0.0",
"python-dateutil >= 2.8.2",
"pydantic >= 2",
"pydantic >= 2.11",
"typing-extensions >= 4.7.1",
]

Expand Down
3 changes: 2 additions & 1 deletion ...api3/client/petstore/python-aiohttp/petstore_api/models/additional_properties_any_type.py
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Expand Up @@ -31,7 +31,8 @@ class AdditionalPropertiesAnyType(BaseModel):
__properties: ClassVar[List[str]] = ["name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion ...penapi3/client/petstore/python-aiohttp/petstore_api/models/additional_properties_class.py
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Expand Up @@ -31,7 +31,8 @@ class AdditionalPropertiesClass(BaseModel):
__properties: ClassVar[List[str]] = ["map_property", "map_of_map_property"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion ...enapi3/client/petstore/python-aiohttp/petstore_api/models/additional_properties_object.py
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Expand Up @@ -31,7 +31,8 @@ class AdditionalPropertiesObject(BaseModel):
__properties: ClassVar[List[str]] = ["name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion ...etstore/python-aiohttp/petstore_api/models/additional_properties_with_description_only.py
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Expand Up @@ -31,7 +31,8 @@ class AdditionalPropertiesWithDescriptionOnly(BaseModel):
__properties: ClassVar[List[str]] = ["name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
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3 changes: 2 additions & 1 deletion samples/openapi3/client/petstore/python-aiohttp/petstore_api/models/all_of_super_model.py
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Expand Up @@ -30,7 +30,8 @@ class AllOfSuperModel(BaseModel):
__properties: ClassVar[List[str]] = ["_name"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
3 changes: 2 additions & 1 deletion ...les/openapi3/client/petstore/python-aiohttp/petstore_api/models/all_of_with_single_ref.py
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Expand Up @@ -32,7 +32,8 @@ class AllOfWithSingleRef(BaseModel):
__properties: ClassVar[List[str]] = ["username", "SingleRefType"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
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3 changes: 2 additions & 1 deletion samples/openapi3/client/petstore/python-aiohttp/petstore_api/models/animal.py
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Expand Up @@ -37,7 +37,8 @@ class Animal(BaseModel):
__properties: ClassVar[List[str]] = ["className", "color"]

model_config = ConfigDict(
populate_by_name=True,
validate_by_name=True,
validate_by_alias=True,
validate_assignment=True,
protected_namespaces=(),
)
Expand Down
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