Unable to generate pydantic-core schema for <class 'starlette.requests.Request'>

[Josanshuo]

Saw a fix by upgrading the pydantic to latest version: https://github.com/jhj0517/Whisper-WebUI/issues/258

Simply changing the requirements.txt with pydantic==4.43.0 won't work, because gradio is locked in a low version 4.19.1 because of googletrans depending on httpx==0.14.1 which is not supported by newer version of gradio.

Wondering if there is a quick work around to resolve the issue without refactoring the code?

[Josanshuo]

Here is the full trace log:

INFO:     IP:6692 - "POST /queue/join HTTP/1.1" 500 Internal Server Error
ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/pydantic/type_adapter.py", line 209, in __init__
    core_schema = _getattr_no_parents(type, '__pydantic_core_schema__')
  File "/usr/local/lib/python3.10/dist-packages/pydantic/type_adapter.py", line 98, in _getattr_no_parents
    raise AttributeError(attribute)
AttributeError: __pydantic_core_schema__

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/uvicorn/protocols/http/h11_impl.py", line 406, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
  File "/usr/local/lib/python3.10/dist-packages/uvicorn/middleware/proxy_headers.py", line 70, in __call__
    return await self.app(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/applications.py", line 113, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/middleware/errors.py", line 187, in __call__
    raise exc
  File "/usr/local/lib/python3.10/dist-packages/starlette/middleware/errors.py", line 165, in __call__
    await self.app(scope, receive, _send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/middleware/exceptions.py", line 62, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/_exception_handler.py", line 62, in wrapped_app
    raise exc
  File "/usr/local/lib/python3.10/dist-packages/starlette/_exception_handler.py", line 51, in wrapped_app
    await app(scope, receive, sender)
  File "/usr/local/lib/python3.10/dist-packages/starlette/routing.py", line 715, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/routing.py", line 735, in app
    await route.handle(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/routing.py", line 460, in handle
    await self.app(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/applications.py", line 113, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/middleware/errors.py", line 187, in __call__
    raise exc
  File "/usr/local/lib/python3.10/dist-packages/starlette/middleware/errors.py", line 165, in __call__
    await self.app(scope, receive, _send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/middleware/cors.py", line 93, in __call__
    await self.simple_response(scope, receive, send, request_headers=headers)
  File "/usr/local/lib/python3.10/dist-packages/starlette/middleware/cors.py", line 144, in simple_response
    await self.app(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/middleware/exceptions.py", line 62, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/_exception_handler.py", line 62, in wrapped_app
    raise exc
  File "/usr/local/lib/python3.10/dist-packages/starlette/_exception_handler.py", line 51, in wrapped_app
    await app(scope, receive, sender)
  File "/usr/local/lib/python3.10/dist-packages/starlette/routing.py", line 715, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/routing.py", line 735, in app
    await route.handle(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/routing.py", line 288, in handle
    await self.app(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/routing.py", line 76, in app
    await wrap_app_handling_exceptions(app, request)(scope, receive, send)
  File "/usr/local/lib/python3.10/dist-packages/starlette/_exception_handler.py", line 62, in wrapped_app
    raise exc
  File "/usr/local/lib/python3.10/dist-packages/starlette/_exception_handler.py", line 51, in wrapped_app
    await app(scope, receive, sender)
  File "/usr/local/lib/python3.10/dist-packages/starlette/routing.py", line 73, in app
    response = await f(request)
  File "/usr/local/lib/python3.10/dist-packages/fastapi/routing.py", line 291, in app
    solved_result = await solve_dependencies(
  File "/usr/local/lib/python3.10/dist-packages/fastapi/dependencies/utils.py", line 639, in solve_dependencies
    ) = await request_body_to_args(  # body_params checked above
  File "/usr/local/lib/python3.10/dist-packages/fastapi/dependencies/utils.py", line 810, in request_body_to_args
    fields_to_extract = get_model_fields(first_field.type_)
  File "/usr/local/lib/python3.10/dist-packages/fastapi/_compat.py", line 283, in get_model_fields
    return [
  File "/usr/local/lib/python3.10/dist-packages/fastapi/_compat.py", line 284, in <listcomp>
    ModelField(field_info=field_info, name=name)
  File "<string>", line 6, in __init__
  File "/usr/local/lib/python3.10/dist-packages/fastapi/_compat.py", line 109, in __post_init__
    self._type_adapter: TypeAdapter[Any] = TypeAdapter(
  File "/usr/local/lib/python3.10/dist-packages/pydantic/type_adapter.py", line 211, in __init__
    core_schema = _get_schema(type, config_wrapper, parent_depth=_parent_depth + 1)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/type_adapter.py", line 81, in _get_schema
    schema = gen.generate_schema(type_)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 490, in generate_schema
    schema = self._generate_schema(obj)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 721, in _generate_schema
    schema = self._generate_schema_inner(obj)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 727, in _generate_schema_inner
    return self._annotated_schema(obj)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 1697, in _annotated_schema
    schema = self._apply_annotations(source_type, annotations)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 1765, in _apply_annotations
    schema = get_inner_schema(source_type)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_schema_generation_shared.py", line 82, in __call__
    schema = self._handler(__source_type)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 1847, in new_handler
    schema = metadata_get_schema(source, get_inner_schema)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 1843, in <lambda>
    lambda source, handler: handler(source)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_schema_generation_shared.py", line 82, in __call__
    schema = self._handler(__source_type)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 1746, in inner_handler
    schema = self._generate_schema(obj)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 721, in _generate_schema
    schema = self._generate_schema_inner(obj)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 747, in _generate_schema_inner
    return self.match_type(obj)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 830, in match_type
    return self._match_generic_type(obj, origin)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 854, in _match_generic_type
    return self._union_schema(obj)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 1141, in _union_schema
    choices.append(self.generate_schema(arg))
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 490, in generate_schema
    schema = self._generate_schema(obj)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 721, in _generate_schema
    schema = self._generate_schema_inner(obj)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 747, in _generate_schema_inner
    return self.match_type(obj)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 834, in match_type
    return self._unknown_type_schema(obj)
  File "/usr/local/lib/python3.10/dist-packages/pydantic/_internal/_generate_schema.py", line 393, in _unknown_type_schema
    raise PydanticSchemaGenerationError(
pydantic.errors.PydanticSchemaGenerationError: Unable to generate pydantic-core schema for <class 'starlette.requests.Request'>. Set `arbitrary_types_allowed=True` in the model_config to ignore this error or implement `__get_pydantic_core_schema__` on your type to fully support it.

If you got this error by calling handler(<some type>) within `__get_pydantic_core_schema__` then you likely need to call `handler.generate_schema(<some type>)` since we do not call `__get_pydantic_core_schema__` on `<some type>` otherwise to avoid infinite recursion.

For further information visit https://errors.pydantic.dev/2.6/u/schema-for-unknown-type

[Josanshuo]

Another reference regarding the latest pydantic_core conflicts with gradio: https://github.com/gradio-app/gradio/issues/9278

[Josanshuo]

Seems root cause is in fastapi: https://github.com/fastapi/fastapi/issues/12133