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django-guardian

django-guardian is implementation of per object permissions [1] as authorization backend which is supported since Django 1.2. It won't work with older Django releases.

Installation

To install django-guardian simply run:

pip install django-guardian

Configuration

We need to hook django-guardian into our project.

  1. Put guardian into your INSTALLED_APPS at settings module:

    INSTALLED_APPS = (
       ...
       'guardian',
    )
    
  2. Add extra authorization backend:

    AUTHENTICATION_BACKENDS = (
        'django.contrib.auth.backends.ModelBackend', # default
        'guardian.backends.ObjectPermissionBackend',
    )
    

Usage

After installation and project hooks we can finally use object permissions with Django.

Lets start really quickly:

>>> jack = User.objects.create_user('jack', 'jack@example.com', 'topsecretagentjack')
>>> admins = Group.objects.create(name='admins')
>>> jack.has_perm('change_group', admins)
False
>>> UserObjectPermission.objects.assign('change_group', user=jack, obj=admins)
<UserObjectPermission: admins | jack | change_group>
>>> jack.has_perm('change_group', admins)
True

Of course our agent jack here would not be able to change_group globally:

>>> jack.has_perm('change_group')
False

Documentation

There is an online documentation available at http://packages.python.org/django-guardian/.

[1]Great peper about this feature is available at http://djangoadvent.com/1.2/object-permissions/.
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