I\'ve models for Books, Chapters and Pages. They are all written by a User:
Books
Chapters
Pages
User
from django.db import models
Suggestion of Julio Marins works! Thnx!
For Django >= 2.* this line:
if isinstance(f, ForeignKey) and f.rel.to in related_models:
Should be replaced with:
if isinstance(f, ForeignKey) and f.remote_field.model in related_models: