"""
博客文章相关的 Pydantic 模式
"""
from datetime import datetime
from typing import Optional
from pydantic import BaseModel


class PostBase(BaseModel):
    """博客文章基础模式"""
    title: str
    slug: str
    content: str


class PostCreate(PostBase):
    """创建博客文章请求模式"""
    pass


class PostUpdate(BaseModel):
    """更新博客文章请求模式"""
    title: Optional[str] = None
    slug: Optional[str] = None
    content: Optional[str] = None


class PostInDB(PostBase):
    """数据库中的博客文章模式"""
    id: int
    created_at: datetime
    updated_at: Optional[datetime] = None
    user_id: int
    
    class Config:
        from_attributes = True


class Post(PostInDB):
    """博客文章响应模式"""
    pass