我正在为大学开发一个Python FastAPI项目。每次运行我的授权依赖项时，都会出现以下错误：
ERROR: Exception in ASGI application
Traceback (most recent call last):
File "C:\Python39\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 366, in run_asgi
result = await app(self.scope, self.receive, self.send)
File "C:\Python39\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 75, in __call__
return await self.app(scope, receive, send)
File "C:\Python39\lib\site-packages\fastapi\applications.py", line 208, in __call__
await super().__call__(scope, receive, send)
File "C:\Python39\lib\site-packages\starlette\applications.py", line 112, in __call__
await self.middleware_stack(scope, receive, send)
File "C:\Python39\lib\site-packages\starlette\middleware\errors.py", line 181, in __call__
raise exc
File "C:\Python39\lib\site-packages\starlette\middleware\errors.py", line 159, in __call__
await self.app(scope, receive, _send)
File "C:\Python39\lib\site-packages\starlette\exceptions.py", line 82, in __call__
raise exc
File "C:\Python39\lib\site-packages\starlette\exceptions.py", line 71, in __call__
await self.app(scope, receive, sender)
File "C:\Python39\lib\site-packages\starlette\routing.py", line 656, in __call__
await route.handle(scope, receive, send)
File "C:\Python39\lib\site-packages\starlette\routing.py", line 259, in handle
await self.app(scope, receive, send)
File "C:\Python39\lib\site-packages\starlette\routing.py", line 61, in app
response = await func(request)
File "C:\Python39\lib\site-packages\fastapi\routing.py", line 216, in app
solved_result = await solve_dependencies(
File "C:\Python39\lib\site-packages\fastapi\dependencies\utils.py", line 496, in solve_dependencies
solved_result = await solve_dependencies(
File "C:\Python39\lib\site-packages\fastapi\dependencies\utils.py", line 525, in solve_dependencies
solved = await call(**sub_values)
File "e:\Dev\Ottomize\Ottomize\backend\app\auth_handler.py", line 60, in get_current_user
token_data = schemas.TokenData(username)
File "pydantic\main.py", line 322, in pydantic.main.BaseModel.__init__
TypeError: __init__() takes exactly 1 positional argument (2 given)
这是我相关的代码：
FAST API 端点：
@app.get("/user/current/info/", response_model=schemas.User)
async def user_info(current_user: schemas.User = Depends(auth_handler.get_current_active_user)):
return current_user
我在我的auth_handler.py中使用的函数：
from fastapi.security import OAuth2PasswordBearer
from jose import JWTError, jwt
from passlib.context import CryptContext
from datetime import datetime, timedelta
from typing import Optional
from fastapi import Depends, HTTPException, status
from . import crud, schemas, config, database
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
#gets user out of db
def get_user(username: str):
db = database.SessionLocal()
return crud.get_user_by_username(db, username)
#gets current user
async def get_current_user(token: str = Depends(oauth2_scheme)):
credentials_exception = HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Could not validate credentials",
headers={"WWW-Authenticate": "Bearer"},
)
try:
payload = jwt.decode(token, config.SECRET_KEY, algorithms=[config.ALGORITHM])
username: str = payload.get("sub")
if username is None:
raise credentials_exception
token_data = schemas.TokenData(username)
except JWTError:
raise credentials_exception
user = get_user(token_data.username)
if user is None:
raise credentials_exception
return user
#gets current user if active
async def get_current_active_user(current_user: schemas.User = Depends(get_current_user)):
if current_user.disabled:
raise HTTPException(status_code=400, detail="Inactive user")
return current_user
我在我的crud.py中使用了以下函数：
def get_user_by_username(db: Session, username: str):
return db.query(models.User).filter(models.User.username == username).first()
使用的SQLAlchemy模型：
from sqlalchemy import Boolean, Column, ForeignKey, Integer, String
from sqlalchemy.orm import relationship
from .database import Base
class User(Base):
__tablename__ = "user"
id = Column(Integer, primary_key=True, index=True)
username = Column(String(100), unique=True, index=True)
mail = Column(String(100), unique=True, index=True)
hashed_password = Column(String(100))
is_active = Column(Boolean, default=True)
permissions = relationship("Permission", back_populates="user")
class Permission(Base):
__tablename__ = "permission"
id = Column(Integer, primary_key=True, index=True)
name = Column(String(100))
user_id = Column(Integer, ForeignKey("user.id"))
user = relationship("User", back_populates="permissions")
使用的pydantic模型：
from typing import List, Optional
from pydantic import BaseModel
#Define Datatype Token
class Token(BaseModel):
access_token: str
token_type: str
#Define Datatype TokenData
class TokenData(BaseModel):
username: str
class Config:
orm_mode = True
#Define Datatype User
class User(BaseModel):
id: int
username: str
mail: str
is_active: Optional[bool]
permissions: List[Permission] = []
class Config:
orm_mode = True
我对 FastAPI 和 Python 一般的语言都非常陌生，希望能得到帮助！
name之前定义了username并且只更改类定义中的第一个字段，您是否希望其行为发生更改？这可能会导致奇怪和奇特的错误（对于默认值的字段和没有默认值的字段如何处理？在这种情况下，所有具有默认值的字段都必须在类中最后定义）。 - MatsLindhBaseModel（但由于您明确提到了它，我无法确定），您可以使用数据类：https://pydantic-docs.helpmanual.io/usage/dataclasses/ （或者您可以编写一个帮助程序初始化器，它接受位置参数）。 - MatsLindh