sqlalchemy 多对多 示例

以下是某系统用户管理数据库设计

用户角色的多对多关系实现

# 多对多 SysUser -> Role
sys_user_role = Table('sys_user_role', Base.metadata,
                      Column('sys_user_id', ForeignKey('sys_user.id', ondelete='CASCADE'), primary_key=True),
                      Column('role_id', ForeignKey('role.id', ondelete='CASCADE'), primary_key=True))


# 系统用户
class SysUser(Base):
    __tablename__ = 'sys_user'

    # ID
    id = Column(UUID, primary_key=True, default=lambda: str(uuid.uuid4()), unique=False)
    # 用户名
    username = Column(String(80), unique=False)
    # 姓名
    name = Column(String(80), unique=False)

    # 密码
    password = Column(String(80), unique=False)
    # 登录 token
    token = Column(String(80), unique=True)
    # 登录 ip
    ip = Column(String(80), unique=False)
    # 登录 时间
    login_time = Column(DateTime(), unique=False)
    # 尝试 登录时间
    try_time = Column(DateTime(), unique=False)
    # 尝试 登录次数
    try_count = Column(Integer, unique=False)

    # 多对多 SysUser -> Role
    # role_list = relationship('Role', secondary=sys_user_role, back_populates='sys_user_list', cascade='delete, delete-orphan', passive_deletes=True)

    def __init__(self, username, name):
        self.username = username
        self.name = name


# 角色
class Role(Base):
    __tablename__ = 'role'

    # ID
    id = Column(UUID, primary_key=True, default=lambda: str(uuid.uuid4()), unique=False)
    # 名称
    name = Column(String(80), unique=False)

    # 多对多 Role -> Authority
    # authority_list = relationship('Authority', secondary=role_authority, back_populates='role_list', cascade='delete, delete-orphan', passive_deletes=True)

    # 多对多 SysUser -> Role
    sys_user_list = relationship('SysUser', secondary=sys_user_role, backref=backref("role_list"))

    def __init__(self, name):
        self.name = name