from pydantic import BaseModel, Field, field_validator
from typing import Optional, List
from datetime import date

class ClassCreate(BaseModel):
    cid : int= Field(...,description="班级编号")
    class_name : str= Field(...,min_length=1, max_length=50, description="班级名称")
    start_time:date
    headteacher : str=Field(...,min_length=1, max_length=50,description="班主任")
    flag:int
class ClassUpdate(BaseModel):
    class_name:Optional[str]=Field(None,min_length=1, max_length=50)
    start_time: Optional[date] = None
    headteacher: Optional[str] = Field(None, min_length=1, max_length=50)
#响应体参数
class ClassResponse(BaseModel):
    cid : int
    class_name : str
    start_time : date
    headteacher : str
    flag : int
class Config:
       from_attributes = True

class ClassListResponse(BaseModel):
    total: int
    items: list[ClassResponse]