protected function deletePriceRule()
    {
        $this->controlAccess('price_rule_delete');

        if ($this->price_rule->delete($this->data_rule['price_rule_id'])) {
            $this->redirect('admin/sale/price', $this->text('Price rule has been deleted'), 'success');
        }

        $this->redirect('', $this->text('Price rule has not been deleted'), 'warning');
    }