I am attempting to create a migration that will automatically add a group and permissions to the group when it is run. I adapted some code from the docs and an example. I can get the migration to add the group but not the permissions. I am getting the following error: TypeError: Direct assignment to the forward side of a many-to-many set is prohibited. Use permissions.set() instead.
I am not sure how to implement this suggestion. Any ideas?
The migration:
from django.db import migrations, models
from django.contrib.auth.models import Group, Permission
from django.contrib.auth.management import create_permissions
def add_group_permissions(apps, schema_editor):
for app_config in apps.get_app_configs():
create_permissions(app_config, apps=apps, verbosity=0)
# Employee
group, created = Group.objects.get_or_create(name='Employee')
if created:
permissions_qs = Permission.objects.filter(
codename__in=[
'can_add_how_to_entry',
'can_change_how_to_entry',
'can_view_how_to_entry',
]
)
group.permissions = permissions_qs
group.save()
class Migration(migrations.Migration):
dependencies = [
('accounts', '0001_initial'),
]
operations = [
migrations.RunPython(add_group_permissions),
]
Remember that group.permissions is a related query manager, not a field, so if you assign something to that you will destroy it. So you need to do something like:
permissions_qs = Permission.objects ...
for permission in permissions_qs:
group.permissions.add(permission)
group.save()