public function __toString()
 {
     // TODO: Implement __toString() method.
     //Form: {{username}} {{action}} {{object}}
     //Nhuan likes your post
     //Tung follow you
     $noti = "";
     $action = "";
     $username = "";
     $type = "";
     if ($this["type"] == FOLLOW) {
         $action = " follow ";
         if ($this["objectType"] == USER) {
             $type = " you ";
         } else {
             $board_title = Board::getBoardById($this->objectID)["board_title"];
             $type = " your board " . ' ' . $board_title;
         }
     } else {
         $type = "your post ";
         if ($this["type"] == LIKE) {
             $action = " liked ";
         } else {
             if ($this["type"] == COMMENT) {
                 $action = " comment on ";
             } else {
                 if ($this["type"] == PIN) {
                     $action = " pinned ";
                 }
             }
         }
     }
     if (isset($this["sender_id"])) {
         $username = User::getUserById($this["sender_id"])["name"];
     } else {
         $username = $this["sender_string"];
     }
     $noti = $username . $action . $type;
     return $noti;
 }
 /**
  * Display the specified resource.
  *
  * @param  int  $id
  * @return \Illuminate\Http\Response
  */
 public function show($id)
 {
     //
     $result = Board::getBoardById($id);
     return response()->json($result);
 }