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 19432 Using get_object_or_404 on a class that isn't a Django model could result in a more obvious error message. Kit Sunde BHold "I have a Calendar model in my app but I wrongly imported calendar.Calendar from python instead which resulted in: type object 'Calendar' has no attribute '_default_manager' Which led me to think it was this issue: https://code.djangoproject.com/ticket/10405 perhaps it would be possible to raise a ValueError if get_object_or_404 receives something that is not of the correct type with ""type object 'Calendar' is not a Django Model"". In _get_queryset it seems like it should raise a ValueErorr if it is not a Model, Manager, or QuerySet if that is what it expects, rather than to assume it is a Model if it's not the other two as it is now. Or perhaps it was just PEBCAK on my part. :)" Cleanup/optimization closed Core (Other) 1.4 Normal fixed BHold Accepted 1 0 0 0 1 0