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/7623 and 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 --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
