This Django application demonstrates a bug in django-polymorphic.

The application djangoPolymorphicTestcase has three model classes:

• Base, a polymorphic.models.PolymorphicModel
• VariantA, which inherits from Base
• VariantB, which inherits from Base

The test creates a VariantA object with primary key of DUPLICATE. It then creates a VariantB object with a primary key of DUPLICATE. As a result we do not have two objects, but a single VariantB object. Accessing it via VariantA.objects() is possible, but throws TypeError.

How to test

PYTHONPATH=/usr/lib/python3/dist-packages/ python3 ./manage.py test