/**
* @param SitemapPopulateEvent $event
* @param Issue $issue
* @return SitemapPopulateEvent
*/
private function generateArticleLinks(SitemapPopulateEvent $event, Issue $issue)
{
$articles = $issue->getArticles();
$journal = $issue->getJournal();
foreach ($articles as $article) {
$event->getGenerator()->addUrl(new UrlConcrete($this->router->generate('ojs_article_page', ['publisher' => $journal->getPublisher()->getSlug(), 'slug' => $journal->getSlug(), 'issue_id' => $issue->getId(), 'article_id' => $article->getId()], true), new \DateTime(), UrlConcrete::CHANGEFREQ_WEEKLY, 1), 'journals-' . $journal->getSlug());
}
return $event;
}