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    <p>I had a similar problem not too long ago. Our solution did the trick, though it might be too simple for your situation. Like everyone is suggesting, we used the django permission system to control what user interactions with models. However, we didn't just try to group users, we also grouped objects through a GenericForeignKey.</p> <p>We built a model that linked to itself to allow for hierarchies to be developed.</p> <pre><code>class Group( models.Model ): name = models.CharField( ... ) parent = models.ForeignKey( 'self', blank=True, null=True) content_type = models.ForeignKey( ContentType ) object_id = models.PositiveIntegerField() content_object = generic.GenericForeignKey( 'content_type', 'object_id' ) ... </code></pre> <p>To make it work, we also created a model to serve as the django User model's user profile. All it contained was a ManyToManyField linked to the Group model above. This allowed us to give users access to zero or more Groups as required. (<a href="http://docs.djangoproject.com/en/dev/topics/auth/#storing-additional-information-about-users" rel="nofollow noreferrer">documentation</a>)</p> <pre><code>class UserProfile( models.Model ): user = models.ForeignKey( User, unique=True ) groups = models.ManyToManyField( Group ) ... </code></pre> <p>This gave us the best of both worlds and kept us from trying to shoehorn everything into django's permission system. I'm using this basic setup to control user's access to sports content (some users can access whole leagues, some only one or two conferences, some only have access to individual teams), and it works well in that situation. It could probably be a generalized enough to fit your needs.</p>
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