I have a model with several bool fields. I'd like to replace them with a single int field where each bit represents one of the old bools. I've added the new int field and run makemigrations. Is there a way I can modify the migrations file and define how I'd like the new int fields' values to be defined? Like I said, I would like them to take the values of the previous bool fields.

CodePudding user response：

Data migration is what you need.

1. Add new field to the model, apply makemigrations.
2. Create a data migration, which would transfer data from old fields to the new one and run it.
3. Remove old fields.

Data migration could be created with:

python manage.py makemigrations --empty yourappname

And inside it you should use RunPython or RunSQL depending on what exactly do you need.