public function describe()
    {
        $columns = [];
        foreach ($this->columns as $id => $params) {
            $columns[$id] = [
                'title'     => $params['title'],
                'type'      => $params['type'],
                'filters'   => $params['filters'],
                'sortable'  => $params['sortable'],
                'visible'   => $params['visible'],
            ];
        }

        return [
            'columns' => $columns,
        ];
    }