django-model-utils

问题 I have some models like this: class Container(models.Model): pass class Parent(models.Model): container = models.ForeignKey(Container, related_name='items') pass class Child(Parent): pass class RedHeadedStepChild(Parent): pass Is it possible to use select_subclasses() to prefetch fields in the container? I want to do something like this: qs = Container.objects.all().prefetch_related('items')\ .select_subclasses() # <--- So that the items related field of each Container is retrieved in each of

问题 I've tried everything found: Can stale content types be automatically deleted in Django? Deleting unused Models, stale content types prompt InvalidBasesError: Cannot resolve bases for [<ModelState: 'users.GroupProxy'>] Django Wagtail CMS migrate: Cannot resolve bases for [<ModelState: 'app.CustomPage'> Django migrate with zinnia- InvalidBasesError: Cannot resolve bases for [<ModelState: 'zinnia.Author'>] So here's my problem: I have: a ComicBook that has a many-to-many Planche 's a Planche