public function setOrder()
    {
        // set order position if exist
        $order = [];
        foreach ($this->data['order'] as $alias => $params) {

            $order = array_flip($order);

            if (empty($params) === false) {

                foreach ($params as $field => $sort) {
                    $order[] = $alias . '.' . $field . ' ' . $sort;
                }
            }
        }

        $this->builder->orderBy($order);

        return null;
    }