public static function getAppliedSorters()
    {
        $order = static::getOrderKey();
        $orderBy = static::getOrderByKey();

        $applied = \Illuminate\Support\Facades\Request::only($order, $orderBy);

        $applied = array_filter($applied);

        $default = [
            $orderBy => static::getDefaultOrderBy(),
            $order => static::getDefaultOrder()
        ];

        return $applied ?: $default;
    }