Django admin command to "fix permissions" (create them properly for proxy models). This is needed because of the following bug in Django (not fixed as of 1.6): https://code.djangoproject.com/ticket/11154

fix_permissions.py

# -*- coding: utf-8 -*-

"""Add permissions for proxy model.

This is needed because of the bug https://code.djangoproject.com/ticket/11154
in Django (as of 1.6, it's not fixed).

When a permission is created for a proxy model, it actually creates if for it's
base model app_label (eg: for "article" instead of "about", for the About proxy
model).

What we need, however, is that the permission be created for the proxy model
itself, in order to have the proper entries displayed in the admin.

"""

from __future__ import unicode_literals, absolute_import, division

import sys

from django.contrib.auth.management import _get_all_permissions
from django.contrib.auth.models import Permission
from django.contrib.contenttypes.models import ContentType
from django.core.management.base import BaseCommand
from django.db.models import get_models
from django.utils.encoding import smart_unicode


class Command(BaseCommand):
    help = "Fix permissions for proxy models."

    def handle(self, *args, **options):
        for model in get_models():
            opts = model._meta
            ctype, created = ContentType.objects.get_or_create(
                app_label=opts.app_label,
                model=opts.object_name.lower(),
                defaults={'name': smart_unicode(opts.verbose_name_raw)})

            for codename, name in _get_all_permissions(opts, ctype):
                p, created = Permission.objects.get_or_create(
                    codename=codename,
                    content_type=ctype,
                    defaults={'name': name})
                if created:
                    sys.stdout.write('Adding permission {}\n'.format(p))

The permissions are created for proxy models, just with the wrong content_type. I updated the code and tested in Django 1.11:

from django.apps import apps
from django.contrib.auth.management import _get_all_permissions
from django.contrib.auth.models import Permission
from django.contrib.contenttypes.models import ContentType


def fix_proxy_permissions(**kwargs):
    for model in apps.get_models():
        opts = model._meta

        if not opts.proxy:
            continue

        # The content_type creation is needed for the tests
        proxy_content_type, __ = ContentType.objects.get_or_create(
            app_label=opts.app_label,
            model=opts.model_name,
        )

        concrete_content_type = ContentType.objects.get_for_model(
            model,
            for_concrete_model=True,
        )

        for code_tuple in _get_all_permissions(opts):
            codename = code_tuple[0]
            name = code_tuple[1]
            # Delete the automatically generated permission from Django
            Permission.objects.filter(
                codename=codename,
                content_type=concrete_content_type,
            ).delete()

            # Create the correct permission for the proxy model
            Permission.objects.get_or_create(
                codename=codename,
                content_type=proxy_content_type,
                defaults={
                    'name': name,
                })

signals.post_migrate.connect(fix_proxy_permissions)

If anyone is interested, https://code.djangoproject.com/ticket/11154 has been fixed and will be part of the 2.2 release.

FYI, for Django <= 1.9, modify the above inner loop from @arthurio's answer

for code_tuple in _get_all_permissions(opts):

to

for code_tuple in _get_all_permissions(opts, concrete_content_type):

_get_all_permissions took two parameters before Django 1.10.

@arthurio I am on 2.2. While running migrations, I got:

auth.0011_update_proxy_permissions
Raw Python operation -> Update the content_type of prox…

I don't know where or how to make the rest of this truncated string show up, but it seems this 'fix' is manual, not automatic. Is that what was intended?

@rebkwok I remember struggling with this once a while back. So why are all the code samples posted after your post still using name? I find this confusing. Clarification welcome.

https://docs.djangoproject.com/en/dev/internals/deprecation/
...
1.10
...
Ability to specify ContentType.name when creating a content type instance will be removed.

Finally, to all and any reading this: I find the reference to "raw python" confusing. Do they mean runPython?
https://docs.djangoproject.com/en/dev/ref/migration-operations/#django.db.migrations.operations.RunPython

@MalikRumi Checkout the 2.2.1 release notes and the related ticket. The fix should be automatic now.

That was fast. Thanks. *“None of you has faith until he loves for his brother or his neighbor what he loves for himself.”*

…

On Tue, Apr 30, 2019 at 3:40 PM Arthur Rio ***@***.***> wrote: @MalikRumi <https://github.com/MalikRumi> Checkout the 2.2.1 release notes <https://docs.djangoproject.com/en/2.2/releases/2.2.1/> and the related ticket <https://code.djangoproject.com/ticket/30351>. The fix should be automatic now. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <https://gist.github.com/7543724#gistcomment-2902383>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABJYQ6XJHNPQO2ZBGRKKMG3PTCVC7ANCNFSM4HJPHMTQ> .

import sys

from django.apps import apps
from django.utils.encoding import smart_text
from django.contrib.auth.management import _get_all_permissions
from django.contrib.auth.models import Permission
from django.contrib.contenttypes.models import ContentType

# proxy model missing permission workaround - modified for Django 2.0
def proxy_perm_create(**kwargs):
    for model in apps.get_models():
        opts = model._meta
        print(opts.verbose_name_raw)
        ctype, created = ContentType.objects.get_or_create(
            app_label=opts.app_label,
            model=opts.object_name.lower())

        for code_tupel in _get_all_permissions(opts):
            codename = code_tupel[0]
            name = code_tupel[1]
            p, created = Permission.objects.get_or_create(
                codename=codename,
                content_type=ctype,
                defaults={'name': name})
            if created:
                sys.stdout.write('Adding permission {}\n'.format(p))


models.signals.post_migrate.connect(proxy_perm_create)

How to Use @wbworks

Does anyone have a nice solution for moving from 1.11 to 2.2 if we have done this? When my migrations were run on deployment the first time I got IntegrityError (1062, "Duplicate entry... because of django/contrib/auth/migrations/0011_update_proxy_permissions.py We didn't need those permissions anymore so I just deleted them and re ran the migration then it worked fine, but what if someone had complex groups/permissions set up...?

@mdaizovi See my comment above, this has been fixed in thee 2.2.1 release.