*/
	public function __construct() {

		$ajax_events = array(
			'query_quiz_questions' => false,
			'favorite_object'      => false,
		);

		foreach ( $ajax_events as $ajax_event => $nopriv ) {
			add_action( 'wp_ajax_' . $ajax_event, array( $this, $ajax_event ) );

			if ( $nopriv ) {
				add_action( 'wp_ajax_nopriv_' . $ajax_event, array( $this, $ajax_event ) );
			}
		}

		self::register();