Also, the following does nothing at all (does not delete and throws no
errors):
for ka in kp.actions:
del ka
But this:
del kp.actions
Throws the same assertion error.
On Aug 6, 11:01 am, Hollister <a.hollister.willi...@gmail.com> wrote:
> Still having a little trouble...here are the relevant mappings:
>
> orm.mapper(Keyphrase, keyphrase_table, properties = {
> 'message':orm.relation(Message, backref='keyphrase'),
> 'campaign':orm.relation(Campaign, backref='keyphrase'),
> 'actions':orm.relation(KeyphraseAction),
> })
>
> orm.mapper(Action, action_table)
>
> orm.mapper(KeyphraseAction, keyphrase_action_table, properties={
> 'action':orm.relation(Action),
> 'successMessage':orm.relation(Message, primaryjoin =
> keyphrase_action_table.c.success_message_id == message_table.c.id),
> 'failureMessage':orm.relation(Message, primaryjoin =
> keyphrase_action_table.c.failure_message_id == message_table.c.id),
> 'emailContent':orm.relation(EmailContent, primaryjoin =
> keyphrase_action_table.c.email_content_id ==
> email_content_table.c.id),
> })
>
> When I attempt to delete a KeyphraseAction from a Keyphrase instance
> as follows:
>
> # kp is a Keyphrase instance
> for i, ka in enumerate(kp.actions):
> del kp.actions[i] # this doesn't work!
>
> It throws an error:
>
> AssertionError: Dependency rule tried to blank-out primary key
> column 'keyphrase_action.keyphrase_id' on instance
>
> But this does work:
>
> assoc = meta.Session.query(m.KeyphraseAction)\
> .filter(and_(m.KeyphraseAction.keyphrase_id == kp.id,
> m.KeyphraseAction.action_id == kp.actions[i].action.id))\
> .one()
>
> meta.Session.delete(assoc)
>
> What am I doing wrong?
>
> On Aug 5, 3:05 pm, Hollister <a.hollister.willi...@gmail.com> wrote:
>
> > That was exactly the conclusion I reached before I read your reply. I
> > modeled it that way and it seems to work perfectly. Guess I was just
> > overthinking it.
>
> > Thanks for getting back to me, Mike.
>
> > On Aug 3, 11:41 pm, Michael Bayer <mike...@zzzcomputing.com> wrote:
>
> > > On Aug 3, 2009, at 5:21 PM, Hollister wrote:
>
> > > > I have 2 tables which are related to each other through an M:N
> > > > relationship (Keyword & Action). Additionally, the relationship itself
> > > > has attributes, which I have as non-key attributes in a third table
> > > > (KeywordAction). I've modeled this dozens of different ways, but have
> > > > yet to get exactly what I want from the model.
>
> > > > At the ORM level, I want Keyword to have a property that is a
> > > > collection of KeywordAction instances. Each KeywordAction instance
> > > > would have a single Action instance property, so I could do things
> > > > like this:
>
> > > > -----------------------------------------------------------------------------------------------------------
> > > > for ka in keyword.keyword_actions:
> > > > if ka.status == 'open':
> > > > ka.action.do_something()
>
> > > > keyword.keyword_actions.append(KeywordAction(action, status = 'open'))
> > > > -----------------------------------------------------------------------------------------------------------
>
> > > > I've tried using the association_proxy, but I get the feeling that's
> > > > not the right tool for this job.
>
> > > the above example doesn't seem like it would need association proxy, a
> > > simple collection of relation()s, i.e. Keyword.keyword_actions,
> > > KeywordAction.action would do based on the navigation illustrated.
>
>
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