#23422: Cannot add Permission to Group in data migration
----------------------------+--------------------------------------
Reporter: tjwalch | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.7
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
----------------------------+--------------------------------------
Changes (by chriscauley):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Comment:
I'm a bit new to the migrations system, but I was able to verify this. I
created a new app called "my_app" and a model called "MyModel". I created
the first migration and then the following data migration:
{{{
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.db import models, migrations
def make_permissions(apps,schema_editor):
Group = apps.get_model("auth","Group")
Permission = apps.get_model("auth","Permission")
my_new_group = Group(name="test_group")
my_new_group.save()
my_new_group.permissions.add(
Permission.objects.get(codename='add_mymodel',content_type__app_label='my_app')
)
class Migration(migrations.Migration):
dependencies = [
('my_app', '0001_initial'),
('auth', '0001_initial'),
]
operations = [
migrations.RunPython(make_permissions,reverse_code=lambda
*args,**kwargs: True)
]
}}}
If I run these separately (`python manage.py migrate my_app 0001;python
manage.py migrate my_app 0002`), everything is cool. Together it breaks
(`python manage.py migrate my_app`). You could solve this yourself by
doing a get_or_create on the content type and on the permission, but that
is by no means an adequate solution.
--
Ticket URL: <https://code.djangoproject.com/ticket/23422#comment:1>
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