[FIXED] Create new Django model int field from existing bool fields

Issue

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.

Solution

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.

Answered By - Yevgeniy Kosmak