ERROR: Exception in ASGI application Traceback (most recent call last): File "D:\anaconda3\Lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 403, in run_asgi result = await app( # type: ignore[func-returns-value] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "D:\anaconda3\Lib\site-packages\uvicorn\middleware\proxy_headers.py", line 60, in __call__ return await self.app(scope, receive, send) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "D:\anaconda3\Lib\site-packages\fastapi\applications.py", line 1054, in __call__ await super().__call__(scope, receive, send) File "D:\anaconda3\Lib\site-packages\starlette\applications.py", line 112, in __call__ await self.middleware_stack(scope, receive, send) File "D:\anaconda3\Lib\site-packages\starlette\middleware\errors.py", line 187, in __call__ raise exc File "D:\anaconda3\Lib\site-packages\starlette\middleware\errors.py", line 165, in __call__ await self.app(scope, receive, _send) File "D:\anaconda3\Lib\site-packages\starlette\middleware\exceptions.py", line 62, in __call__ await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send) File "D:\anaconda3\Lib\site-packages\starlette\_exception_handler.py", line 53, in wrapped_app raise exc File "D:\anaconda3\Lib\site-packages\starlette\_exception_handler.py", line 42, in wrapped_app await app(scope, receive, sender) File "D:\anaconda3\Lib\site-packages\starlette\routing.py", line 714, in __call__ await self.middleware_stack(scope, receive, send) File "D:\anaconda3\Lib\site-packages\starlette\routing.py", line 734, in app await route.handle(scope, receive, send) File "D:\anaconda3\Lib\site-packages\starlette\routing.py", line 288, in handle await self.app(scope, receive, send) File "D:\anaconda3\Lib\site-packages\starlette\routing.py", line 76, in app await wrap_app_handling_exceptions(app, request)(scope, receive, send) File "D:\anaconda3\Lib\site-packages\starlette\_exception_handler.py", line 53, in wrapped_app raise exc File "D:\anaconda3\Lib\site-packages\starlette\_exception_handler.py", line 42, in wrapped_app await app(scope, receive, sender) File "D:\anaconda3\Lib\site-packages\starlette\routing.py", line 73, in app response = await f(request) ^^^^^^^^^^^^^^^^ File "D:\anaconda3\Lib\site-packages\fastapi\applications.py", line 1009, in openapi return JSONResponse(self.openapi()) ^^^^^^^^^^^^^^ File "D:\anaconda3\Lib\site-packages\fastapi\applications.py", line 981, in openapi self.openapi_schema = get_openapi( ^^^^^^^^^^^^ File "D:\anaconda3\Lib\site-packages\fastapi\openapi\utils.py", line 514, in get_openapi field_mapping, definitions = get_definitions( ^^^^^^^^^^^^^^^^ File "D:\anaconda3\Lib\site-packages\fastapi\_compat.py", line 232, in get_definitions field_mapping, definitions = schema_generator.generate_definitions( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "D:\anaconda3\Lib\site-packages\pydantic\json_schema.py", line 363, in generate_definitions self.generate_inner(schema) File "D:\anaconda3\Lib\site-packages\pydantic\json_schema.py", line 443, in generate_inner if 'ref' in schema: ^^^^^^^^^^^^^^^ File "<frozen _collections_abc>", line 813, in __contains__ File "D:\anaconda3\Lib\site-packages\pydantic\_internal\_mock_val_ser.py", line 41, in __getitem__ return self._get_built().__getitem__(key) ^^^^^^^^^^^^^^^^^ File "D:\anaconda3\Lib\site-packages\pydantic\_internal\_mock_val_ser.py", line 58, in _get_built raise PydanticUserError(self._error_message, code=self._code) pydantic.errors.PydanticUserError: `TypeAdapter[typing.Annotated[langserve.validation.openaiInvokeRequest, <class 'langserve.validation.openaiInvokeRequest'>, Body(PydanticUndefined)]]` is not fully defined; you should define `typing.Annotated[langserve.validation.openaiInvokeRequest, <class 'langserve.validation.openaiInvokeRequest'>, Body(PydanticUndefined)]` and all referenced types, then call `.rebuild()` on the instance. For further information visit https://errors.pydantic.dev/2.11/u/class-not-fully-defined
时间: 2025-07-30 10:02:28 浏览: 11
在使用 FastAPI 或 LangServe 时,开发者可能会遇到与 Pydantic 类型定义相关的异常问题,尤其是在生成 OpenAPI 文档时。这类错误通常表现为 `PydanticUserError: TypeAdapter is not fully defined`,表明在构建类型适配器时缺少必要的信息,导致无法正确生成文档或处理请求。
该错误的根本原因通常与 Pydantic 模型的定义方式有关。例如,当使用泛型模型(Generic Models)或未正确指定字段类型时,FastAPI 在尝试为这些模型生成 OpenAPI schema 时可能无法解析其结构。LangServe 作为基于 FastAPI 构建的框架,在处理链式调用(Runnable)和模型序列化时也依赖于 Pydantic 的类型系统,因此同样会受到影响。
解决此类问题的一种方法是确保所有用于请求体、响应体或路径参数的 Pydantic 模型都具有完整的类型注解。避免使用未指定具体类型的 `Generic` 或 `TypeVar`,或者在必要时提供默认类型。例如,以下代码展示了如何正确地定义一个泛型模型,并确保其可以被 FastAPI 正确解析:
```python
from pydantic import BaseModel
from typing import Generic, TypeVar
T = TypeVar('T')
class ResponseModel(BaseModel, Generic[T]):
data: T
message: str
success: bool
class User(BaseModel):
id: int
name: str
# 在路由中使用时
@app.get("/user/{user_id}", response_model=ResponseModel[User])
async def get_user(user_id: int):
return {"data": {"id": user_id, "name": "Alice"}, "message": "Success", "success": True}
```
此外,检查依赖库的版本也很重要。某些版本的 FastAPI 或 Pydantic 可能存在兼容性问题,特别是在使用较早版本时。建议使用最新稳定版,并确保所有依赖项(如 `fastapi`, `pydantic`, `langserve`)保持版本一致性。
如果问题仍然存在,可以在 FastAPI 实例化时通过 `docs_url=None` 禁用 OpenAPI 文档生成,作为临时解决方案。但这会使得 `/docs` 和 `/redoc` 等自动生成的文档页面不可用:
```python
from fastapi import FastAPI
app = FastAPI(docs_url=None)
```
对于 LangServe 用户,还可以尝试显式定义 `Runnable` 的输入和输出类型,并确保它们能够被 Pydantic 正确解析。这包括避免使用未定义具体类型的泛型链式结构。
总之,`TypeAdapter is not fully defined` 错误主要源于类型定义不完整或不一致,确保模型定义清晰、具体,并且与 Pydantic 的类型系统兼容,是解决此类问题的关键[^3]。
---
阅读全文
相关推荐




















