我设置了这些表:http://pastie.org/627764
...
# This is the association table for the many-to-many relationship between
# groups and members - this is, the memberships.
user_group_table = Table('user_group', metadata,
Column('user_name', Integer, ForeignKey('user.user_name',
onupdate="CASCADE", ondelete="CASCADE")),
Column('group_name', Integer, ForeignKey('group.group_name',
onupdate="CASCADE", ondelete="CASCADE"))
)
class Group(DeclarativeBase):
__tablename__ = 'group'
group_name = Column(Unicode(16), primary_key=True)
users = relation('User', secondary=user_group_table, backref='groups')
...
我正在尝试删除一个用户与其组中的一个用户之间的关系,但我无法真正提出执行此操作的查询。有什么方法可以使用 Sqlalchemy 来做到这一点吗?
感谢您的宝贵时间。
最佳答案
您的意思是要从组中删除用户?
# fetch the mapped classes
group = Session.query(Group).some_filters().one()
user = Session.query(User).some_filters().one()
# group.users is a list of all users in this group
# remove one and it will be removed from the DB
group.users.remove( user )
Session.commit()
关于Sqlalchemy : association table for many-to-many relationship between groups and members. 如何删除关系?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1467823/