public static function getNewChatMessages($conversation_id)
 {
     $last_message = Session::get('last-chat-message');
     $messages = MfrChatMessages::where('conversation_id', $conversation_id)->also('id', '>', $last_message)->desc()->as_array()->get();
     $last_message = $messages[0]['id'];
     $messages = array_reverse($messages);
     $i = 0;
     foreach ($messages as $message) {
         $u = MfrUsers::find($message['user_id'])[0];
         if ($u->avatar == '' || ($u->avatar = null)) {
             $u->avatar = DEFAULT_IMAGE;
         }
         $messages[$i]['user-info'] = $u;
         $i++;
     }
     Session::set('last-chat-message', $last_message);
     return $messages;
 }