public function onPostSerialize(ObjectEvent $event)
    {
        $teaser = $event->getObject();
        $visitor = $event->getVisitor();
        $context = $event->getContext();

        if (!($teaser instanceof Teaser)) {
            return;
        }

        $visitor->addData('teaserId', $context->accept(sprintf('%s;%s', $teaser->getType(), $teaser->getId())));
    }