public function execute()
 {
     if ($blog_id = waRequest::post('blog_id')) {
         $model = new blogEmailsubscriptionModel();
         if (waRequest::post('subscribe')) {
             $model->insert(array('blog_id' => $blog_id, 'contact_id' => wa()->getUser()->getId(), 'status' => 1, 'datetime' => date('Y-m-d H:i:s')), 1);
         } else {
             $model->deleteByField(array('blog_id' => $blog_id, 'contact_id' => wa()->getUser()->getId()));
         }
     }
 }