FastApi: 422 Unprocessable Entity-CodePudding

I'm getting this error while trying to accept a pedantic model. After debugging for quite some time I believe the problem is with accepting CodeCreate

Pydantic model

class BaseCode(BaseModel):
    index: Optional[int] = Field(None)
    email: EmailStr
    gen_time: datetime
    expire_time: datetime


class CodeCreate(BaseCode):
    code: int
    used_time: Optional[datetime] = Field(None)

    class Config:
        orm_mode = True

class Message(BaseModel):
    message: str

Handler

@app.post('/verify-code', response_model=schemas.Message, responses={404: {"model": schemas.Message}, 406: {"model": schemas.Message}})
async def verify_code(code: schemas.CodeCreate, response: Response, device_name: str = Body(..., embed=True), db=Depends(get_db)):

    result = crud.verify_and_insert_code(db=db, code=code)
    if result == 'matched':
        response.status_code = status.HTTP_202_ACCEPTED
        return crud.start_new_session(db=db, session=schemas.Session(session_id='1234', start_time=datetime.now(), email=code.email, device_name=device_name))
    elif result == 'not-matched':
        response.status_code = status.HTTP_200_OK
    elif result == 'expire':
        response.status_code = status.HTTP_406_NOT_ACCEPTABLE
    elif result == 'invalid':
        response.status_code = status.HTTP_404_NOT_FOUND

    return schemas.Message(message="Item not found")

CodePudding user response：

According to MDN here, a 422 Unprocessable Entity means that the information of the request could not be processed.

In this case, the most likely problem is that the data of the POST request that is sent does not match with the Pydantic model.

Make sure the data that is sent is in the correct format.

CodePudding user response：

The error clearly has to do with the data (or type of data) the client sends in the POST request. The client (and specifically the "payload") should look like something like this:

import requests
from datetime import datetime

url = 'http://127.0.0.1:8000/verify-code'
payload = {"code": {"code": 1, "email": "[email protected]", "gen_time": datetime.isoformat(datetime.now()), "expire_time": datetime.isoformat(datetime.now())}, "device_name": "my device's name"}
resp = requests.post(url=url, json=payload) 
print(resp.json())