/**
  * Returns a transient by chat_id, building it if it doesn't exist
  *
  * @author  caseypatrickdriscoll
  *
  * @created 2015-08-27 18:54:19
  * 
  * @param  int    $chat_id   The given post_id of the requested patchchat
  * @return string $transient The json representation of a chat
  */
 public static function get($chat_id)
 {
     $transient = get_transient('patchchat_' . $chat_id);
     if ($transient === false) {
         $transient = PatchChat_Transient::build($chat_id);
     }
     return $transient;
 }