public function downvote()
 {
     if (isset($_POST["id"])) {
         $id = $_POST["id"];
         $answerModel = new Answer();
         $answerModel->downvote($id);
         $this->jsonResponse(["status" => "OK"]);
     } else {
         $this->jsonResponse(["error" => "Missing parameter ID"], 400);
     }
 }