[Django] #14408: Admin Error when subclassing ContentType for generic Relations

[Django]

#14408: Admin Error when subclassing ContentType for generic Relations
--------------------------+-------------------------------------------------
 Reporter:  MS            |       Owner:  nobody    
   Status:  new           |   Milestone:            
Component:  Contrib apps  |     Version:  1.2       
 Keywords:                |       Stage:  Unreviewed
Has_patch:  0             |  
--------------------------+-------------------------------------------------
 If you subclass the ContentType with a proxy model, for example to use
 other ordering or change some other Meta options, you will get an error in
 the Admin interface, when using GenericTabularInline.

 The problem is line 357 in
 
http://code.djangoproject.com/browser/django/trunk/django/contrib/contenttypes/generic.py,
 where the test is with equal but should be subcalss instead.

 Example in models:
 {{{
 from django.db import models
 from django.contrib.contenttypes import generic
 from django.contrib.contenttypes.models import ContentType as CT

 class ContentType(CT):

     class Meta:
         proxy = True
         ordering = ('app_label', 'model')

 class ModelWithGeneric(models.Model):
     content_type = models.ForeignKey(ContentType)
     object_id = models.PositiveIntegerField()
     contentObject = generic.GenericForeignKey('content_type', 'object_id')

 class ObjectWithGeneric(models.Model):
     media = generic.GenericRelation(ModelWithGeneric,
 content_type_field='content_type', object_id_field='object_id')
 }}}

 Example in Admin:
 {{{
 from django.contrib.contenttypes import generic
 from django.contrib import admin

 from apps.models import *

 class GenericInlineAdmin(generic.GenericTabularInline):
     model = ModelWithGeneric


 class ObjectAdmin(admin.ModelAdmin):
     inlines = (
         GenericInlineAdmin,
     )
 admin.site.register(ObjectWithGeneric, ObjectAdmin)

 }}}

 Error is: fk_name '<django.db.models.fields.related.ForeignKey object at
 0x0319A1F0>' is not a ForeignKey to ContentType

-- 
Ticket URL: <http://code.djangoproject.com/ticket/14408>
Django <http://code.djangoproject.com/>
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