Django Migrations Add Field with Default as Function of Model

Question

I added a new, non-nullable field to my Django model and am trying to use migrations to deploy that change. How would I set default value to use for existing models to be so

Answer 1

You should also define a reverse for your function set_my_defaults(), in case you what to revert the migration in the future.

def reverse_set_default(apps, schema_editor):
    pass

The reverse function in this case need to do nothing, since you are removing the field.

And add it to RunPython:

migrations.RunPython(set_my_defaults, reverse_set_default),