fastapi/pydantic_test.py

from datetime import datetime
from typing import List, Optional

from pydantic import BaseModel, ValidationError
from sqlalchemy import Column, Integer, String
from sqlalchemy.dialects.postgresql import ARRAY


class User(BaseModel):
    id: int
    name: str = "John Snow"
    create_time: Optional[datetime] = None
    friends: List[int] = []


external_data = {
    "id": "123",
    "create_time": "2020-12-22 12:22",
    "friends": [1, 2, "3"],  # "3"是可以int("3")的
}

user = User(**external_data)
print(user.id, user.friends)
print(repr(user.create_time))
print(user.dict())


try:
    User(id=1001, create_time=datetime.today(), friends=[1, 2, "not number"])
except ValidationError as e:
    print(e.json())


class CompanyOrm(Base):
    __tablename__ = "companies"
    id = Column(Integer, primary_key=True, nullable=False)
    public_key = Column(String(20), index=True, nullable=False, unique=True)
    name = Column(String(63), unique=True)
    domains = Column(ARRAY(String(255)))


class CityInfo(BaseModel):
    province: str
    country: str
    is_affected: Optional[bool] = None  # 与bool的区别是可以不传，默认是null