#9741: generic relations: reverse chain of references not followed fully yon
delete
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Reporter: wiswaud | Owner: nobody
Status: new | Milestone:
Component: Contrib apps | Version: 1.0
Keywords: genericrelation genericforeignkey | Stage: Unreviewed
Has_patch: 0 |
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If i have an object c, which has a genericforeignkey relation to b, which
in turn has a genericforeignkey relation to a, and i delete a, b does get
deleted, but not c. If i were to delete b, c does get deleted.
If these were foreign keys, the chain of reverse relations would get
properly deleted, but for genericrelations, it only goes back 1 link.
{{{
from django.db import models
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic
class A(models.Model):
t = models.CharField(max_length=50)
gr_b_reverse = generic.GenericRelation('GR_B')
class FK_B(models.Model):
"""An object with a foreign key, that we'll point to an A"""
fk = models.ForeignKey('A')
class FK_C(models.Model):
"""An object with a foreign key, that we'll point to a FK_B"""
fk = models.ForeignKey('FK_B')
class GR_B(models.Model):
"""An object with a generic key, that we'll point to an A"""
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_obj = generic.GenericForeignKey(ct_field="content_type",
fk_field="object_id")
gr_c_reverse = generic.GenericRelation('GR_C')
class GR_C(models.Model):
"""An object with a generic key, that we'll point to a GR_B
# test proper deletion of gr_c pointing to gr_b if we delete gr_b
>>> a=A.objects.create(t='foo')
>>> gr_b=GR_B.objects.create(content_obj=a)
>>> gr_c=GR_C.objects.create(content_obj=gr_b)
>>> gr_b.delete()
>>> print A.objects.all(), GR_B.objects.all(), GR_C.objects.all()
[<A: A object>] [] []
>>> a.delete()
# test proper deletion of gr_b pointing to a if we delete a
>>> a=A.objects.create(t='foo')
>>> gr_b=GR_B.objects.create(content_obj=a)
>>> a.delete()
>>> print A.objects.all(), GR_B.objects.all()
[] []
# test proper deletion of fk_b pointing to a, fk_c pointing to b, gr_b
pointing
# to a, and gr_c pointing to gr_b if we delete a
>>> a=A.objects.create(t='foo')
>>> gr_b=GR_B.objects.create(content_obj=a)
>>> gr_c=GR_C.objects.create(content_obj=gr_b)
>>> fk_b=FK_B.objects.create(fk=a)
>>> fk_c=FK_C.objects.create(fk=fk_b)
>>> print A.objects.all(), GR_B.objects.all(), GR_C.objects.all(),
FK_B.objects.all(), FK_C.objects.all()
[<A: A object>] [<GR_B: GR_B object>] [<GR_C: GR_C object>] [<FK_B:
FK_B object>] [<FK_C: FK_C object>]
>>> a.delete()
>>> print A.objects.all(), GR_B.objects.all(), GR_C.objects.all(),
FK_B.objects.all(), FK_C.objects.all()
[] [] [] [] []
# FAIL! we instead get:
# [] [] [<GR_C: GR_C object>] [] []
"""
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_obj = generic.GenericForeignKey(ct_field="content_type",
fk_field="object_id")
}}}
--
Ticket URL: <http://code.djangoproject.com/ticket/9741>
Django <http://code.djangoproject.com/>
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