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
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