CODEWITHSUNDEEP
pythondjangopython-2.7django-usersdjango-1.11
Nurzhan Nogerbek
Nurzhan Nogerbek

Reputation: 5236

How correctly add permissions to User model of Django?

I am tring to add custom permissions to User model (django.contrib.auth.models).

To __init__.py file of my users app I add:

from django.db.models.signals import pre_migrate
from django.contrib.contenttypes.models import ContentType
from django.contrib.auth import models as auth_models
from django.contrib.auth.models import Permission
from django.conf import settings
from django.dispatch import receiver


@receiver(pre_migrate, sender=auth_models)
def add_user_permissions(sender, **kwargs):
    content_type = ContentType.objects.get_for_model(settings.AUTH_USER_MODEL)
    Permission.objects.get_or_create(codename='view_user', name=' Can view users', content_type=content_type)
    Permission.objects.get_or_create(codename='change_user_password', name=' Can change user password', content_type=content_type)

settings.py:

INSTALLED_APPS = [
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django.forms',
    'django_select2',  # "django-select2" application
    'custom_app',  # "custom_app" application
    'custom_app_2',  # "custom_app_2" application
    'modeltranslation',  # "django-modeltranslation" application
    'users', # "users" application
]

ERROR:

Traceback (most recent call last):
  File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/utils/autoreload.py", line 228, in wrapper
    fn(*args, **kwargs)
  File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 117, in inner_run
    autoreload.raise_last_exception()
  File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/utils/autoreload.py", line 251, in raise_last_exception
    six.reraise(*_exception)
  File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/utils/autoreload.py", line 228, in wrapper
    fn(*args, **kwargs)
  File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/apps/registry.py", line 85, in populate
    app_config = AppConfig.create(entry)
  File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/apps/config.py", line 94, in create
    module = import_module(entry)
  File "/usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/Applications/Projects/web/dashboard.kase.kz/users/__init__.py", line 5, in <module>
    from django.contrib.contenttypes.models import ContentType
  File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/contrib/contenttypes/models.py", line 139, in <module>
    class ContentType(models.Model):
  File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/base.py", line 110, in __new__
    app_config = apps.get_containing_app_config(module)
  File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/apps/registry.py", line 247, in get_containing_app_config
    self.check_apps_ready()
  File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/apps/registry.py", line 125, in check_apps_ready
    raise AppRegistryNotReady("Apps aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.

Question: How to fix this error?

Upvotes: 1

Views: 5708

Answers (3)

Nurzhan Nogerbek
Nurzhan Nogerbek

Reputation: 5236

Finally I found solution from documentation.

1) You need to create empty migration with next command:

python manage.py makemigrations --empty users

users - name of the app

2) Command create 0001_initial.py file where you need to put next code:

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

from __future__ import unicode_literals
from django.db import migrations

def forwards_func(apps, schema_editor):
    User = apps.get_model('auth', 'User')
    Permission = apps.get_model('auth', 'Permission')
    ContentType = apps.get_model('contenttypes', 'ContentType')
    content_type = ContentType.objects.get_for_model(User)
    db_alias = schema_editor.connection.alias
    Permission.objects.using(db_alias).bulk_create([
        Permission(codename='view_user', name=' Can view users', content_type=content_type),
        Permission(codename='change_user_password', name=' Can change user password', content_type=content_type)
    ])


class Migration(migrations.Migration):

    dependencies = [
    ]

    operations = [
        migrations.RunPython(forwards_func),
    ]

Upvotes: 3

Ykh
Ykh

Reputation: 7717

copy all code in your init.py to a new created file called signals.py and change your __init__.py to :

default_app_config = 'user.apps.UserConfig'

signals.py

from django.db.models.signals import pre_migrate
from django.contrib.contenttypes.models import ContentType
from django.contrib.auth.models import AuthConfig
from django.contrib.auth.models import Permission
from django.conf import settings
from django.dispatch import receiver


@receiver(pre_migrate, sender=AuthConfig)
def add_user_permissions(sender, **kwargs):
    content_type = ContentType.objects.get_for_model(settings.AUTH_USER_MODEL)
    Permission.objects.get_or_create(codename='view_user', name=' Can view users', content_type=content_type)
    Permission.objects.get_or_create(codename='change_user_password', name=' Can change user password', content_type=content_type)

then in user/apps.py:

from django.apps import AppConfig


class UserConfig(AppConfig):
    name = 'user'
    verbose_name = 'User'

    def ready(self):
        import user.signals

your error is occer because __init__.py will call User in models.py,but User model will be register after __init__.py run over,so you need call your signal when your User model is ready.

You want to add some perms related with User so:

class MyUser(User):

    class Meta:
        permissions = (
            ("view_user", "view_user"),
            ("change_user_password", "change_user_password"),
        )

and in settings.py

AUTH_USER_MODEL = "user.MyUser"

Upvotes: 0

Vijesh Venugopal
Vijesh Venugopal

Reputation: 1641

Please try adding this code at the top of the init.py file:

import django
django.setup()

Upvotes: 0

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