pydantic.error_wrappers.ValidationError：For Trip type=value_error.missing 的 11 个验证错误

Question

Im getting this error with my pydantic schema, but oddly it is generating the object correctly, and sending it to the SQLAlchemy models, then it suddenly throws error for all elements in the model.

response -> id
  field required (type=value_error.missing)
response -> date
  field required (type=value_error.missing)
response -> time
  field required (type=value_error.missing)
response -> price
  field required (type=value_error.missing)
response -> distance
  field required (type=value_error.missing)
response -> origin_id
  field required (type=value_error.missing)
response -> destination_id
  field required (type=value_error.missing)
response -> driver_id
  field required (type=value_error.missing)
response -> passenger_id
  field required (type=value_error.missing)
response -> vehicle_id
  field required (type=value_error.missing)
response -> status
  field required (type=value_error.missing)

i must say that all the fields should have values. And the error trace do not references any part of my code so i dont even know where to debug. Im a noob in SQLAlchemy/pydantic

here are some parts of the code

class Trip(BaseModel):
    id: int
    date: str
    time: str
    price: float
    distance: float
    origin_id: int
    destination_id: int
    driver_id: int
    passenger_id: int
    vehicle_id: int
    status: Status

    class Config:
        orm_mode = True

class TripDB(Base):
    __tablename__ = 'trip'
    __table_args__ = {'extend_existing': True}
    id = Column(Integer, primary_key=True, index=True)
    date = Column(DateTime, nullable=False)
    time = Column(String(64), nullable=False)
    price = Column(Float, nullable=False)
    distance = Column(Float, nullable=False)
    status = Column(String(64), nullable=False)

    origin_id = Column(
        Integer, ForeignKey('places.id'), nullable=False)
    destination_id = Column(
        Integer, ForeignKey('places.id'), nullable=False)

    origin = relationship("PlaceDB", foreign_keys=[origin_id])
    destination = relationship("PlaceDB", foreign_keys=[destination_id])

    driver_id = Column(
        Integer, ForeignKey('driver.id'), nullable=False)
    vehicle_id = Column(
        Integer, ForeignKey('vehicle.id'), nullable=False)
    passenger_id = Column(
        Integer, ForeignKey('passenger.id'), nullable=False)

def create_trip(trip: Trip, db: Session):
    origin = db.query(models.PlaceDB).filter(models.PlaceDB.id == trip.origin_id).first()
    destination = db.query(models.PlaceDB).filter(models.PlaceDB.id == trip.destination_id).first()
    db_trip = TripDB(
        id=(trip.id or None),
        date=trip.date or None, time=trip.time or None, price=trip.price or None, 

    distance=trip.distance or None, 
            origin_id=trip.origin_id or None, destination_id=(trip.destination_id or None), status=trip.status or None, 
            driver_id=trip.driver_id or None, passenger_id=trip.passenger_id or None, vehicle_id=trip.vehicle_id or None, origin=origin, destination=destination)
    try:
        db.add(db_trip)
        db.commit()
        db.refresh(db_trip)
        return db_trip

    except:
        return "Somethig went wrong"

Answer 1

这似乎是 pydantic 模型上的一个错误，它也发生在我身上，我无法修复它，但实际上如果你只是跳过路线中的类型检查，它工作正常

Answer 2

It seems like there is conflict in your schema and create_trip function. Have you checked whether you are passing correct param to your schema? You have defined most of the fields as not nullable, and you are passing None as alternative value in db.add() command.

I had similar problem with my code, and I figured that naming and type convention between schema and server.py. After matching the field names and type in both file, I resolved the error of field required (type=value_error.missing).

# project/schema.py
from pydantic import BaseModel

# here I had made mistake by using target_URL in server.py
# variable name and type should be same in both schema and server
class URLBase(BaseModel):
    target_url: str


class URL(URLBase):
    is_active: bool
    clicks: int

    class Config:
        orm_mode = True


class URLInfo(URL):
    url: str
    admin_url: str

# project/server.py
@app.post('/url', response_model=schema.URLInfo)
def create_short_url(url: schema.URLBase, db: Session = Depends(get_db)):
    if not validators.url(url.target_url):
        raise bad_request_message(message="Your provided URL is not valid!")
    chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    key = "".join(secrets.choice(chars) for _ in range(5))
    secret_key = "".join(secrets.choice(chars) for _ in range(8))
    db_url = models.URL(target_url=url.target_url, key=key, secret_key=secret_key)
    db.add(db_url)
    db.commit()
    db.refresh(db_url)
    db_url.url = key
    db_url.admin_url = secret_key

    return db_url

Answer 3

Please check the return statement, i had similar issue and got the issue reolved by correcting my return statement. I see return statement missing or wrong in create_trip function.