Hello, here is a sample:
children_table = Table('children', metadata,
Column('id', Integer, primary_key=True))
child2group_table = Table('child2group', metadata,
Column('child_id', Integer,
ForeignKey('children.id'), nullable=False),
Column('group_id', Integer,
ForeignKey('groups.id'), nullable=False))
groups_table = Table('groups', metadata,
Column('id', Integer, primary_key=True))
mapper(Child, children_table,
properties={ 'groups':relation(Group,
secondary=child2group_table) })
mapper(Group, groups_table, properties={
'children':relation(Child, secondary=child2group_table) })
Speaking English, this means "there are groups and children, and child
can belong to some groups".
When I issue this:
group = session.query(Group).get(2)
session.delete(group)
session.flush()
SA does this:
2007-09-03 11:40:25,915 INFO sqlalchemy.engine.base.Engine.0x..8c
BEGIN
2007-09-03 11:40:25,918 INFO sqlalchemy.engine.base.Engine.0x..8c
DELETE FROM child2group WHERE child2group.child_id = ? AND
child2group.group_id = ?
2007-09-03 11:40:25,918 INFO sqlalchemy.engine.base.Engine.0x..8c [[3,
2], [4, 2]]
2007-09-03 11:40:25,919 INFO sqlalchemy.engine.base.Engine.0x..8c
DELETE FROM groups WHERE groups.id = ?
2007-09-03 11:40:25,920 INFO sqlalchemy.engine.base.Engine.0x..8c [2]
2007-09-03 11:40:25,921 INFO sqlalchemy.engine.base.Engine.0x..8c
COMMIT
Well, I dont mind, because this is what I really wanted to have.
Please, explain, why does this happen? I thought only group item would
be deleted and I would get orphaned records in child2group table.
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