function DefaultContentSubscriber::preExport

Reacts before an entity is exported.

Adds an export callback for `link` field items to ensure that, if the link points to a content entity, it is marked as a dependency of the entity being exported.

Parameters

\Drupal\Core\DefaultContent\PreExportEvent $event: The event object.

File

core/modules/link/src/EventSubscriber/DefaultContentSubscriber.php, line 43

Class

DefaultContentSubscriber

Subscribes to default content-related events.

Namespace

Code

public function preExport(PreExportEvent $event) : void {
  $event->setCallback('field_item:link', function (LinkItemInterface $item, ExportMetadata $metadata) : array {
    $values = $item->getValue();
    $url = $item->getUrl();
    if (!$url->isRouted()) {
      // The URL is not routed, so there's nothing else to do.
      return $values;
    }
    $route_name = explode('.', $url->getRouteName());
    // We can rely on this pattern because routed entity URLs are generated
    // in a consistent way with the `entity` scheme.
    // @see \Drupal\Core\Url::fromUri()
    if (count($route_name) === 3 && $route_name[0] === 'entity' && $route_name[2] === 'canonical') {
      $target_entity_type_id = $route_name[1];
      $route_parameters = $url->getRouteParameters();
      $target_id = $route_parameters[$target_entity_type_id];
      $target = $this->entityTypeManager
        ->getStorage($target_entity_type_id)
        ->load($target_id);
      if ($target instanceof ContentEntityInterface) {
        $values['target_uuid'] = $target->uuid();
        unset($values['uri']);
        $metadata->addDependency($target);
      }
    }
    return $values;
  });
}