[Django] #16128: cascade delete does not work for proxy models

[Django]

#16128: cascade delete does not work for proxy models
-------------------------------------+-------------------------------------
 Reporter:  xkennyx@…                |          Owner:  nobody
     Type:  Bug                      |         Status:  new
Milestone:                           |      Component:  Database layer
  Version:  1.3                      |  (models, ORM)
 Keywords:  cascade delete proxy     |       Severity:  Normal
  meta                               |   Triage Stage:  Unreviewed
Has patch:  0                        |  Easy pickings:  0
-------------------------------------+-------------------------------------
 Hi all :), there is problem with cascade delete, when proxy model is used.
 example:

 {{{
 class ExUser(User):
     class Meta:
         proxy = True

 # work:
 class Profile(models.Model):
     user = models.ForeignKey(User)

 # does not work:
 class Profile(models.Model):
     user = models.ForeignKey(ExUser)

 }}}
 when I delete user, then in first scenario is profile also deleted, but
 when I want use proxy as foreign key, then profile is not deleted, and it
 lead to integrity problem in DB

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Ticket URL: <https://code.djangoproject.com/ticket/16128>
Django <https://code.djangoproject.com/>
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