added fix for OneToOneRel error happening in case of Polymorphic model (#429)

CHANGELOG.md

@@ -9,6 +9,7 @@
 
 - fix: Display `created` timestamp in server timezone ([#404](https://github.com/jazzband/django-auditlog/pull/404))
 - fix: Handle port in `remote_addr` ([#417](https://github.com/jazzband/django-auditlog/pull/417))
+- fix: Handle the error with AttributeError: 'OneToOneRel' error occur during a `PolymorphicModel` has relation with other models  ([#429](https://github.com/jazzband/django-auditlog/pull/429))
 
 ## 2.1.1 (2022-07-27)
 

auditlog/diff.py

@@ -70,7 +70,11 @@ def get_field_value(obj, field):
         else:
             value = smart_str(getattr(obj, field.name, None))
     except ObjectDoesNotExist:
-        value = field.default if field.default is not NOT_PROVIDED else None
+        value = (
+            field.default
+            if getattr(field, "default", NOT_PROVIDED) is not NOT_PROVIDED
+            else None
+        )
 
     return value
 

auditlog_tests/tests.py

@@ -1145,7 +1145,6 @@ class ChoicesFieldModelTest(TestCase):
         )
 
     def test_changes_display_dict_single_choice(self):
-
         self.assertEqual(
             self.obj.history.latest().changes_display_dict["status"][1],
             "Red",