Fixed the admin_filters tests for Postgres.

tests/regressiontests/admin_filters/tests.py

@@ -673,7 +673,7 @@ class ListFiltersTests(TestCase):
         """
 
         modeladmin = DepartmentFilterEmployeeAdmin(Employee, site)
-        request = self.request_factory.get('/', {'department': '1'})
+        request = self.request_factory.get('/', {'department': self.john.pk})
         changelist = self.get_changelist(request, Employee, modeladmin)
 
         queryset = changelist.get_query_set(request)
@@ -685,7 +685,7 @@ class ListFiltersTests(TestCase):
         choices = list(filterspec.choices(changelist))
         self.assertEqual(choices[2]['display'], 'DEV')
         self.assertEqual(choices[2]['selected'], True)
-        self.assertEqual(choices[2]['query_string'], '?department=1')
+        self.assertEqual(choices[2]['query_string'], '?department=%s' % self.john.pk)
 
     def test_fk_with_to_field(self):
         """