public function getAllByPostType($lang = "", $postTypeID)
    {
        $orderBy = (isset($_GET['order'])) ? $orderBy = $_GET['order'] : 'tagID';
        $orderType = (isset($_GET['type'])) ? $orderType = $_GET['type'] : 'DESC';
        // get data
        return Tag::where('postTypeID', $postTypeID)->orderBy($orderBy, $orderType)->paginate(Tag::$rowsPerPage);
    }