from pydantic import BaseModel
from datetime import datetime
from typing import Optional

class UserBase(BaseModel):
    openid: str
    unionid: Optional[str] = None
    avatar: Optional[str] = None
    nickname: Optional[str] = None

class UserCreate(UserBase):
    pass

class UserUpdate(BaseModel):
    avatar: Optional[str] = None
    nickname: Optional[str] = None

class UserInDB(UserBase):
    id: int
    create_time: datetime
    
    class Config:
        from_attributes = True

class User(UserInDB):
    pass