# model/classes.py
# 班级表：对应建表语句中的 c_lass（补充 class_name 字段，便于展示与统计）
from sqlalchemy import Column, Integer, String, Date
from sqlalchemy.orm import relationship

from database import Base


class Classinfo(Base):
    __tablename__ = "c_lass"

    class_id = Column(Integer, primary_key=True, autoincrement=True)
    class_name = Column(String(50), nullable=False, comment="班级名称，如 Java2301")
    start_time = Column(Date, nullable=False, comment="开课时间")
    is_deleted = Column(Integer, default=0, nullable=False, comment="逻辑删除: 0正常 1删除")

    # 反向关联
    teachers = relationship("Teacher", back_populates="classes")
    students = relationship("Student", back_populates="classes")

    def __repr__(self):
        return f"<Classinfo(class_id={self.class_id}, class_name='{self.class_name}')>"