public function indexAction()
 {
     header('content-type: application/json');
     header('Access-Control-Allow-Origin: *');
     header('Access-Control-Allow-Methods: POST');
     $comments = CommentModel::showComments($this->pdo, htmlentities($_POST['id']));
     if (isset($_SESSION['auth'])) {
         $needed = $_SESSION['auth']['username'];
     } else {
         $needed = '';
     }
     for ($i = 0; $i < count($comments); $i++) {
         if ($comments[$i]['author'] == $needed) {
             $comments[$i]['author'] = 'Moi';
         }
     }
     echo json_encode($comments);
 }