ValueError: Related model u'app.model' cannot be resolved

Question

I have two applications (ook and eek say) and I want to use a foreign key to a model in ook from a model in eek. Both are

Answer 1

In my case, It was the cache and previous migrations that resulted in this error. I removed __pycache__ and migrations folder and then re-run the migrations command and it worked.

Remember, when you'll do python manage.py makemigrations it won't see any new migrations and will console output no changes detected. You'll have to do python manage.py makemigrations your_app_name instead to make things work.