61 lines
1.7 KiB
Python
61 lines
1.7 KiB
Python
from sqlalchemy import (Column, Integer, String, Text,
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BigInteger,ForeignKey,VARCHAR,DateTime,UniqueConstraint,text
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)
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from sqlalchemy.dialects.mysql import TINYINT
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from core.database import Base
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from datetime import datetime
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#班级老师关系表 class_teachers 中间表 ORM 模型完整定义
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#字段包括id,class_id,teacher_id,role,created_at,updated_at,is_deleted
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class ClassTeachers(Base):
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__tablename__ = "class_teachers"
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__table_args__ = (
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UniqueConstraint("class_id", "teacher_id", "role", name="uk_class_teacher_role"),
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)
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id = Column(
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BigInteger
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,primary_key=True
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,autoincrement=True
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,comment='关系')
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class_id = Column(
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Integer
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,ForeignKey('classes.id')
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,nullable=False
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,comment='关联 classes.id'
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)
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teacher_id = Column(
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Integer
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,ForeignKey('teachers.id')
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,nullable=False
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,comment='关联 teachers.id'
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)
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role = Column(
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VARCHAR(30)
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,nullable=False
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,comment='老师在班级中的角色：head_teacher班主任 / lecturer授课老师 / assistant助教'
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)
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created_at = Column(
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DateTime
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,nullable=False
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,default=datetime.now
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,server_default=text("CURRENT_TIMESTAMP")
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,comment='创建时间'
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)
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updated_at = Column(
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DateTime
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,nullable=False
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,default=datetime.now
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,onupdate=datetime.now
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,server_default=text("CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP")
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,comment='更新时间'
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)
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is_deleted = Column(
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TINYINT
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,nullable=False
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,default=0
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,server_default=text("0")
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,comment='逻辑删除'
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)
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