public function setPagerListProductClass()
    {
        $conditions = $this->query_filter;
        $conditions['count'] = true;

        $pager = array(
            'query' => $this->query_filter,
            'total' => (int) $this->product_class->getList($conditions)
        );

        return $this->data_limit = $this->setPager($pager);
    }