ValueError: Can't bulk create a multi-table inherited model

Problem

I have a super Notification(models.Model) class which I use to create many notification subclasses such as PostNotification(Notification), CommentNotification(Notification), etc., and when trying to run CommentNotification.objects.bulk_create(my_list_of_notification_objects), i get the following traceback:

File "/home/me/.virtualenvs/project/local/lib/python2.7/site-packages/django/db/models/query.py", line 429, in bulk_create
    raise ValueError("Can't bulk create a multi-table inherited model")
ValueError: Can't bulk create a multi-table inherited model

and upon inspecting the query.py file, we get this causes the error:

for parent in self.model._meta.get_parent_list():
      if parent._meta.concrete_model is not self.model._meta.concrete_model:
           raise ValueError("Can't bulk create a multi-table inherited model")

Environment

• Django Model Utils version: 3.1.1
• Django version: 1.11.7
• Python version: 2.7.3

Example

PostNotification.objects.bulk_create(
   [PostNotification(related_user=user, post=instance) for user in users]
)

throws the above exception

[aldenjenkins]

CORRECTION: IT WAS NOT ACTUALLY FIXED!

running Notification.objects.bulk_create([SubClassNotification(<vals>),SubClassNotification(<vals>)] only creates base class Notification objects and subsequently running SubClassNotification.objects.all() returns an empty queryset.

[aldenjenkins]

I believe the issue is impossible to fix. My solution months ago was to redo the wntire notification backend and just use a single Notification() model with a type char selection field to differentiate the type of notification that it was