Hi All,
I have this relation:
# Users
user_table = Table('user', self.metadata,
Column('id', Integer, primary_key=True),
Column('place_id', Integer),
mysql_engine='InnoDB'
)
# Places
places_table = Table('places', self.metadata,
Column('id', Integer, primary_key=True),
mysql_engine='InnoDB'
)
mapper(User, user_table,properties={
'user' : relation(Place,
primaryjoin=(user_table.c.place_id==places_table.c.id),
foreign_keys=[places_table.c.id]),
}
)
mapper(Place, places_table, properties={
'id':places_table.c.id,
}
)
A /Place/ can be associated with multiple users.
I fetch a user as so:
query = session.query(User).options(
eagerload('place')).\
filter_by(id=id)
user = query.one()
If there's a place associated with the user I end up with :
user.place[], where user.place[0] is the first place, etc.
Now, I want to remove the relation between this User and this Place,
without deleting the place. So, I tried:
user.place_id = None
*That fails with "AssertionError: Dependency rule tried to blank-out
primary key column 'places.id' on instance '<Place at 0x1116df6d0>'"*
So, then I tried:
del user.place[0]
That fails also. I've also tried the various incarnations of
passive_deletes=True and False (fails).
The only solution I've come up with is this:
session.expunge(user.place[0])
user.place_id = None
That works, but it doesn't feel right. Is there a better way? Thanks!
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