public function readFacetofaceSession($id) {
        $model = $this->readObject($id, 'facetoface_sessions');
        $model->dates = $this->readStoreRecords('facetoface_sessions_dates', ['sessionid' => $id]);
        $model->url = $this->cfg->wwwroot . '/mod/facetoface/signup.php?s=' . $id;
        return $model;
    }