# model/teacher_model.py
# 教师信息表模型
from sqlalchemy import Column, String, Integer
from sqlalchemy.orm import relationship

from database import Base


class Teacher(Base):
    __tablename__ = "tea_info"  # 表名

    # 字段定义
    id = Column(String(15), primary_key=True, index=True)   # 主键，索引
    name = Column(String(20), nullable=False)               # 姓名，非空
    phone = Column(String(20), unique=True, nullable=False) # 电话，唯一，非空
    type = Column(String(20), nullable=False)               # 教师职位,非空
    is_deleted = Column(Integer, nullable=False, default=0) # 逻辑删除(软删除),0是未删除,1是删除,默认为0

    head_classes = relationship("ClsMgmt",
                                foreign_keys="ClsMgmt.head_tea_id",
                                back_populates="head_teacher")

    lecturer_classes = relationship("ClsMgmt",
                                    foreign_keys="ClsMgmt.lecturer_id",
                                    back_populates="lecturer")