Django Admin class that add some urls wich can call predefined action for given object.

ActionForObjectAdmin.py

from django.contrib import admin
from django.conf.urls.defaults import patterns, url
from django.shortcuts import redirect, Http404

class ActionForObjectAdmin(admin.ModelAdmin):
    """
    Admin that add some urls wich can call an action for given object.
    
    Example:
        if url is /admin/myapp/mymodel/object_id/
        and if I have a declatered action named 'my_action'
        if I open a url /admin/myapp/mymodel/object_id/action/my_action/
        then 'my_action' will be executed for object from myapp.mymodel
        with pk=object_id
    """
    def actions_view(self, request, object_id, action):
        """
        Add a method that handle actions for given object id
        This is done because we dont wont to send post for do action for one element
        """
        queryset = self.queryset(request).filter(pk=object_id)
        if queryset.exists():
            action = self.get_action(action)
            if action:
                action[0](self, request, queryset)
                opts = self.model._meta
                return redirect('admin:%s_%s_changelist' % (opts.app_label, opts.module_name))
        raise Http404
    
    def get_urls(self):
        """
        Add url for action view
        """
        info = self.model._meta.app_label, self.model._meta.module_name

        urls =  patterns('',
            url(r'^(.+)/action/([\w]+)/$',
                 self.admin_site.admin_view(self.actions_view),
                name='%s_%s_actions' % info,
            ),
        ) + super(ActionForObjectAdmin, self).get_urls()
        return urls