Fixed #9362 -- Prevented inline forms from overwriting the content_type_id attribute on objets being inlined. Thanks to carljm for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10667 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/admin_inlines/models.py

@@ -0,0 +1,51 @@
+"""
+Testing of admin inline formsets.
+
+"""
+from django.db import models
+from django.contrib.contenttypes.models import ContentType
+from django.contrib.contenttypes import generic
+
+class Parent(models.Model):
+    name = models.CharField(max_length=50)
+
+    def __unicode__(self):
+        return self.name
+
+class Teacher(models.Model):
+    name = models.CharField(max_length=50)
+
+    def __unicode__(self):
+        return self.name
+
+class Child(models.Model):
+    name = models.CharField(max_length=50)
+    teacher = models.ForeignKey(Teacher)
+
+    content_type = models.ForeignKey(ContentType)
+    object_id = models.PositiveIntegerField()
+    parent = generic.GenericForeignKey()
+
+    def __unicode__(self):
+        return u'I am %s, a child of %s' % (self.name, self.parent)
+
+__test__ = {'API_TESTS': """
+
+# Regression test for #9362
+
+>>> sally = Teacher.objects.create(name='Sally')
+>>> john = Parent.objects.create(name='John')
+>>> joe = Child.objects.create(name='Joe', teacher=sally, parent=john)
+
+The problem depends only on InlineAdminForm and its "original" argument, so
+we can safely set the other arguments to None/{}. We just need to check that
+the content_type argument of Child isn't altered by the internals of the
+inline form.
+
+>>> from django.contrib.admin.helpers import InlineAdminForm
+>>> iaf = InlineAdminForm(None, None, {}, {}, joe)
+>>> iaf.original
+<Child: I am Joe, a child of John>
+
+"""
+}