Upgrading django from 1.8 to 2.2.0

Question

Im upgrading my django project from 1.8 to 2.2.0(Using Python 3.6 from virtualenv). I have done the below changes.

1. Added on_delete to all the Foreign Key fields
2. Changed the url reverse import as from django.urls import reverse
3. Included path/re_path instead of url in all the app's url files.
4. Changed the MIDDLEWARE_CLASSES import in settings files to MIDDLEWARE = {}

I tried to run the server, still it says "TypeError: init () missing 1 required positional argument: 'on_delete' and it is pointing to /usr2/santhosh/myproject/myapp/migrations/0002_abc.py

What should I do now? Do I need to delete all the migration files from the app and re-run python manage.py migrate or what?? Help me you are aware.

Answer 1

Migration files are still just python files so you need to update all references inside those too.

If you want an easy way to do this, take a look at Easy way to set on_delete across entire application

Answer 2

That message means that you forgot to change a FK. Use this to know what models are.

`cat [your_model].py | egrep -i --color -o 'models\.ForeignKey\((.*?)'   | egrep -i -v 'on_delete'`, 

don't forget to doing this in every type of relationship, not just ForeignKey types, also OneToOne ...etc.