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Changes between Initial Version and Version 1 of Ticket #27128

-              initial
+              v1
 If need another codes from my project, please tell about it
+Update
+Same error I had when tested a method "get_admin_url()" of the model Book with next a testing code
+{{{
+def test_get_admin_url(self):
+        self.client.force_login(self.active_superuser)
+        response = self.client.get(self.book.get_admin_url())
+        self.assertEqual(response.status_code, 200)
+}}}
+Ending a traceback
+{{{
+        if not num:
+            raise self.model.DoesNotExist(
+                "%s matching query does not exist." %
+                self.model._meta.object_name
+            )
+        raise self.model.MultipleObjectsReturned(
+            "get() returned more than one %s -- it returned %s!" %
+>           (self.model._meta.object_name, num)
+        )
+E       apps.books.models.MultipleObjectsReturned: get() returned more than one Book -- it returned 3!
+}}}