Django Admin: Limiting access to objects in the admin on an instance level

instance_based_admin_permissions

from django.contrib import admin
from more_with_admin.examples import models

class DocumentAdmin(admin.ModelAdmin):
   
    def queryset(self, request):
        qs = super(DocumentAdmin, self).queryset(request)

        # If super-user, show all comments
        if request.user.is_superuser:
            return qs
        
        return qs.filter(added_by=request.user)

From: http://www.ibm.com/developerworks/opensource/library/os-django-admin/index.html