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Changes between Initial Version and Version 1 of Ticket #19255, comment 1

-              initial
+              v1
 {{{
 from django.db import models
 from django.contrib.contenttypes import generic
+from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 …
     content_type = models.ForeignKey(ContentType, related_name='content')
     object_id = models.PositiveIntegerField()
     object = generic.GenericForeignKey()
+    object = GenericForeignKey()
     def clean(self):
-        assert self.object_id
         assert self.object_id
 …
 Then I create a model admin for the other model:
 {{{
 from django.contrib.contenttypes import generic
+from django.contrib.contenttypes.admin import GenericStackedInline
 from django.contrib import admin
-from testcase.models import Model, AnotherModel
+class ModelInline(generic.GenericStackedInline):
+from .models import Model, AnotherModel
+class ModelInline(GenericStackedInline):
     model = Model