protected function _actionAdd($context)
    {
        $entity = parent::_actionAdd($context);

        if ($entity->owner->isSubscribable()) {
            $notification = $this->createNotification(array(
                'name' => 'topic_add',
                'object' => $entity,
                'subscribers' => $entity->owner->subscriberIds->toArray(),
            ))->setType('post', array('new_post' => true));
        }

        return $entity;
    }