public function saveColumnFields($postId)
    {
        //Meta key
        $metaKey = "modularity-mod-posts-expandable-list";

        //Bail early if autosave
        if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
            return false;
        }

        //Bail early if cron
        if (defined('DOING_CRON') && DOING_CRON) {
            return false;
        }

        //Bail early if not a post request
        if (!isset($_POST) || (is_array($_POST) && empty($_POST)) || !is_array($_POST)) {
            return false;
        }

        //Update if nonce verification succeed
        if (isset($_POST['modularity_post_columns']) && wp_verify_nonce($_POST['modularity_post_columns'],
                'save_columns')) {
            //Delete if not posted data
            if (!isset($_POST[$metaKey])) {
                delete_post_meta($postId, $metaKey);
                return;
            }

            //Save meta data
            update_post_meta($postId, $metaKey, $_POST[$metaKey]);
        }
    }