protected function setProductClassProductClassField($product_class_id)
    {
        $this->data_product_class = array();

        if (is_numeric($product_class_id)) {

            $this->data_product_class = $this->product_class->get($product_class_id);

            if (empty($this->data_product_class)) {
                $this->outputHttpStatus(404);
            }
        }
    }