Django: Add Permissions to Groups during Migration

migration.py

# YMMV

from django.conf import settings
from django.contrib.auth.models import Group, Permission
from django.core.management.sql import emit_post_migrate_signal
from django.db import migrations, models
import django.db.models.deletion
import logging


logger = logging.getLogger(__name__)

role_permissions = {
    'Some Role': [
        # the perms
    ],
}


# See https://code.djangoproject.com/ticket/23422
def add_role_permissions(apps, schema_editor):
    emit_post_migrate_signal(2, False, 'default')

    for r in role_permissions:
        role, created = Group.objects.get_or_create(name=r)
        logger.info(f'{r} Role retrieved')
        for p in role_permissions[r]:
            perm, created2 = Permission.objects.get_or_create(codename=p)
            role.permissions.add(perm)
            logger.info(f'Permitting {r} to {p}')
        role.save()


class Migration(migrations.Migration):

    initial = True

    dependencies = [
        ('contenttypes', '__latest__'), # required or emit_post_migrate_signal will bail out
        ('auth', '__latest__'), # possibly required if using guardian / allauth
        ('sites', '__latest__'), # required if using allauth or emit_post_migrate_signal will bail out due to missing site
        ('guardian', '__latest__'), # required if using guardian or emit_post_migrate_signal will bail out due to missing anon user
    ]

    operations = [
        migrations.RunPython(add_role_permissions),
    ]