from pydantic import BaseModel, Field
from typing import Optional

class TeacherBase(BaseModel):
    teacher_no: str = Field(..., max_length=50, description="教师编号")
    name: str = Field(..., max_length=50, description="教师姓名")
    phone: str = Field(..., max_length=50, description="手机号")

class TeacherCreate(TeacherBase):
    pass

class TeacherUpdate(BaseModel):
    name: Optional[str] = Field(None, max_length=50, description="教师姓名")
    phone: Optional[str] = Field(None, max_length=50, description="手机号")