6、请求体的组合嵌套使用

from fastapi import APIRouter
from typing import List, Union, Optional
from datetime import date

from pydantic import BaseModel, Field, field_validator

app03 = APIRouter()


class Addr(BaseModel):
    province: str
    city: str


class User(BaseModel):
    # name: str = Field(pattern=r"^a")
    name: str
    age: int = Field(default=0, gt=0, lt=100)
    birth: Union[date, None] = None
    friend: List[int] = []
    description: Optional[str] = None
    addr: Addr

    @field_validator("name")
    def name_must_alpha(cls, value):
        assert value.isalpha(), "Name must be alpha"
        return value


class Data(BaseModel):
    data: List[User]


@app03.post("/user")
async def data(user: User):
    return user


@app03.post("/data")
async def data(data: Data):
    return data