Django migration error :you cannot alter to or from M2M fields, or add or remove through= on M2M fields

Question

I\'m trying to modify a M2M field to a ForeignKey field. The command validate shows me no issues and when I run syncdb :

ValueError: Cannot alter field xxx i         


        

Answer 1

If you're still developing the application, and don't need to preserve your existing data, you can get around this issue by doing the following:

1. Delete and re-create the db.

2. go to your project/app/migrations folder

3. Delete everything in that folder with the exception of the init.py file. Make sure you also delete the pycache dir.

4. Run syncdb, makemigrations, and migrate.