Deleting an inherited model in Django?

Question

Django

We have two models:
class A(models.Model): pass # Non-abstract
class B(A): pass
Deleting an object A, you need to delete a derived B. The opposite option is not suitable.

Answer 1

If I understand correctly, it doesn't matter here that B inherits from A. You just have a corresponding object of class B for every object of class A, right? Then signals.pre_delete will help you

Answer 2

If I understand correctly, what you need is OneToOneField :

class B(A):
  a = models.OneToOneField(A, parent_link=True)