entityManager = $entityManager; $this->termStorage = $entityManager->getStorage('taxonomy_term'); } /** * {@inheritdoc} */ public function applies(RouteMatchInterface $route_match) { return $route_match->getRouteName() == 'entity.taxonomy_term.canonical' && $route_match->getParameter('taxonomy_term') instanceof TermInterface; } /** * {@inheritdoc} */ public function build(RouteMatchInterface $route_match) { $breadcrumb = new Breadcrumb(); $breadcrumb->addLink(Link::createFromRoute($this->t('Home'), '')); $term = $route_match->getParameter('taxonomy_term'); // Breadcrumb needs to have terms cacheable metadata as a cacheable // dependency even though it is not shown in the breadcrumb because e.g. its // parent might have changed. $breadcrumb->addCacheableDependency($term); // @todo This overrides any other possible breadcrumb and is a pure // hard-coded presumption. Make this behavior configurable per // vocabulary or term. $parents = $this->termStorage->loadAllParents($term->id()); // Remove current term being accessed. array_shift($parents); foreach (array_reverse($parents) as $term) { $term = $this->entityManager->getTranslationFromContext($term); $breadcrumb->addCacheableDependency($term); $breadcrumb->addLink(Link::createFromRoute($term->getName(), 'entity.taxonomy_term.canonical', ['taxonomy_term' => $term->id()])); } // This breadcrumb builder is based on a route parameter, and hence it // depends on the 'route' cache context. $breadcrumb->addCacheContexts(['route']); return $breadcrumb; } }