id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 28575 Allow pickling dynamically created Model exception classes (DoesNotExist, MultipleObjectsReturned, RelatedObjectDoesNotExist) Rachel Tobin nobody "Example: {{{ >>> import django >>> import pickle >>> pickle.dumps(django.contrib.auth.models.User.DoesNotExist) >>> PicklingError: Can't pickle : it's not found as django.contrib.auth.models.DoesNotExist }}} *Instances* of `Model.DoesNotExist` are pickleable as fixed in #17776, however, the class itself is not. This is particularly problematic when using the Django test runner with the `--parallel` option enabled when a `Model.DoesNotExist` exception is raised. The result of this is the test runner bailing with a `pickle.PicklingError`, making it exceptionally difficult to debug the cause of the `Model.DoesNotExist`." Bug closed Database layer (models, ORM) 1.11 Normal fixed Accepted 1 0 0 0 0 0