Django helper for showing related objects that would be cascade deleted on deletion of an object.

deletable_objects_snippet.py

from django.conf import settings
from django.db.models.deletion import Collector
from django.db.utils import ConnectionRouter

def deletable_objects(obj):
  """
  Return a generator that yields (model, instance) tuples
  of instances related to obj (including obj itself).
  
  Essentially, programmatic access to the data Django Admin
  shows when asking 'are you sure' prior to deleting an
  instance.
  
  NB: m2m instances are not yielded by
  Collector.instances_with_model() but the m2m data would be
  deleted.
  """
  router = ConnectionRouter(settings.DATABASE_ROUTERS)
	using = router.db_for_write(obj.__class__)
	collector = Collector(using)
	collector.collect([obj])
	return collector.instances_with_model()


# Example. Show all the unique models that have instances
# related to an instance.
from somewhere.models import MyModel
my_model = MyModel.objects.get(id=some_id)
unique_models = set()
for d in deletable_objects(my_model):
	unique_models.add(d[0]._meta.object_name)
unique_models

thanks