assign_perm doesn't work in migrations (Django 1.8, Guardian 1.3)

[keattang]

I'm trying to run a migration that looks like this:

# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.db import models, migrations
from guardian.shortcuts import assign_perm, get_objects_for_user
from django.contrib.auth import get_user_model


def setUserPerms(apps, schema_editor):
    User = get_user_model()
    Project = apps.get_model('api', 'Project')

    for proj in Project.objects.all():
        print("Setting owner permissions for "+proj.name+"//"+user.username)
        user = User.objects.get(pk=proj.owner_user.pk)
        assign_perm('manage_project', user, proj)

class Migration(migrations.Migration):

    dependencies = [
        ('api', '0077_auto_20150715_0504'),
    ]

    operations = [
        migrations.RunPython(setUserPerms, reverse_code=migrations.RunPython.noop),
    ]

The migration runs without any errors and successfully prints to the terminal but upon inspecting the database no changes are actually made and the permissions therefore not set.

[brianmay]

I am going to close this and use #281 instead, as most of the discussion is already there.