def test_foreignkeys(self):
ftm1 = ForeignTestModel.objects.create(characters="foreign1")
ftm2 = ForeignTestModel.objects.create(characters="foreign2")
tm = TestModel()
tm.boolean = False
tm.characters = 'testing'
tm.foreign_test_model = ftm1
self.assertEqual(set(tm.dirty_fields), set(('boolean', 'characters', 'foreign_test_model')))
tm.save()
self.assertEqual(tm.dirty_fields, tuple())
tm.foreign_test_model = ftm2
self.assertEqual(tm.dirty_fields, ('foreign_test_model', ))
tm.foreign_test_model.characters = "foreign2.0"
self.assertEqual(tm.foreign_test_model.dirty_fields, ('characters', ))
