def group_permissions(self, group, perm, obj, approved=True):
        return self.get_for_model(obj).select_related(
            'user', 'group', 'creator').filter(group=group, codename=perm,
                                               approved=approved)
Get objects that have Group perm permission on
dataset/ETHPy150Open jazzband/django-authority/authority/managers.py/PermissionManager.group_permissions