private function validationAction()
 {
     //no id => redirect home
     if (array_key_exists('id', $_GET)) {
         $iId = intval($_GET['id']);
         $oProduct = ProductManager::get($iId);
         // product not found => redirect home
         if (null === $oProduct) {
             $this->homeAction();
             return;
         } else {
             $aAllComments = CommentManager::getAllComments($oProduct);
             require ROOT . 'src/ecommerce/view/validation.php';
         }
     } else {
         $aAllComments = CommentManager::getAllComments();
         require ROOT . 'src/ecommerce/view/validation.php';
     }
 }