thanks, it's the same problem
On May 24, 5:56 pm, Alex Gaynor <alex.gay...@gmail.com> wrote:
> On Sun, May 24, 2009 at 10:53 AM, Viktor <viktor.n...@gmail.com> wrote:
>
> > Hi,
>
> > I have two models, a parent and a child, and would like to extend an
> > already existing parent to have the child attributes as well. I'm
> > likely to miss something obvious, but couldn't find it.
>
> > class Attendee(models.Model):
>
> > and
>
> > class Submission(Attendee):
> > attendee = models.OneToOneField(Attendee, parent_link=True)
>
> > extends upon Attendee.with a hand-coded backward relation (I'll be
> > happy to drop this if my problem can be solved without it)
>
> > These work well:
> > >>> attendee = models.Attendee.objects.create(user=User.objects.get(pk=1),
> > nametag='', conference=conf)
> > >>> submit1 = models.Submission.objects.create(user=User.objects.get(pk=1),
> > nametag='', conference=conf, title='Title', abstract='Abstract',
> > document='no/doc', topic=topic)
>
> > but how can I bind an already existing Attendee object to a new
> > Submission object? Something along the lines of
>
> > >>> submit2 = models.Submission.objects.create(attendee=attendee,
> > title='Title', abstract='Abstract', document='no/doc', topic=topic)
> > Traceback (most recent call last):
> > File "<console>", line 1, in <module>
> > File "/home/nagyv/virtualenv/django-1.0.2/lib/python2.5/site-
> > packages/Django-1.0.2_final-py2.5.egg/django/db/models/manager.py",
> > line 99, in create
> > return self.get_query_set().create(**kwargs)
> > File "/home/nagyv/virtualenv/django-1.0.2/lib/python2.5/site-
> > packages/Django-1.0.2_final-py2.5.egg/django/db/models/query.py", line
> > 319, in create
> > obj.save(force_insert=True)
> > File "/home/nagyv/workspace/MKKE/conference/models.py", line 212, in
> > save
> > if not self.topic in self.conference.topic_set.all():
> > File "/home/nagyv/virtualenv/django-1.0.2/lib/python2.5/site-
> > packages/Django-1.0.2_final-py2.5.egg/django/db/models/fields/
> > related.py", line 235, in __get__
> > raise self.field.rel.to.DoesNotExist
> > DoesNotExist
>
> > or
>
> > >>> submit2 = models.Submission(title='Title', abstract='Abstract',
> > document='no/doc', topic=topic)
> > >>> submit2.attendee = attendee
> > >>> submit2.save()
> > Traceback (most recent call last):
> > File "<console>", line 1, in <module>
> > File "/home/nagyv/workspace/MKKE/conference/models.py", line 212, in
> > save
> > if not self.topic in self.conference.topic_set.all():
> > File "/home/nagyv/virtualenv/django-1.0.2/lib/python2.5/site-
> > packages/Django-1.0.2_final-py2.5.egg/django/db/models/fields/
> > related.py", line 235, in __get__
> > raise self.field.rel.to.DoesNotExist
> > DoesNotExist
>
> > thanks,
> > Viktor
>
> Take a look at this ticket:http://code.djangoproject.com/ticket/7623and
> possibly the attached patch (I'm not familiar with that patch itself, but
> that code looks remarkably similar to some we use where I work).
>
> Alex
>
> --
> "I disapprove of what you say, but I will defend to the death your right to
> say it." --Voltaire
> "The people's good is the highest law."--Cicero
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