public function setGanalytics(
        $enable = null,
        $utm_source = null,
        $utm_medium = null,
        $utm_term = null,
        $utm_content = null,
        $utm_campaign = null
    ) {
        if (!($this->tracking_settings instanceof TrackingSettings)) {
            $this->tracking_settings = new TrackingSettings();
        }
        $this->tracking_settings->setGanalytics(
            $enable,
            $utm_source,
            $utm_medium,
            $utm_term,
            $utm_content,
            $utm_campaign
        );
    }