class MenuHierarchySubscriber in YAML Content 8

An event subscriber to correct link parent reference formatting.

Using entity references and processing for parent menu links within YAML results in the entity being loaded and assigned to the parent value, but the schema for menu content links expects this value to be a string instead. This event subscriber replaces the entity object with the appropriate reference string instead prior to saving.

Hierarchy

• class \Drupal\yaml_content\EventSubscriber\MenuHierarchySubscriber implements \Symfony\Component\EventDispatcher\EventSubscriberInterface

1 string reference to 'MenuHierarchySubscriber'

yaml_content.services.yml in ./yaml_content.services.yml

yaml_content.services.yml

1 service uses MenuHierarchySubscriber

yaml_content.event_subscriber.yaml_content_menu_hierarchy in ./yaml_content.services.yml

Drupal\yaml_content\EventSubscriber\MenuHierarchySubscriber

File

src/EventSubscriber/MenuHierarchySubscriber.php, line 19

Namespace

Drupal\yaml_content\EventSubscriber

class MenuHierarchySubscriber implements EventSubscriberInterface {

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    $events[YamlContentEvents::ENTITY_PRE_SAVE][] = [
      'serializeMenuParent',
    ];
    return $events;
  }

  /**
   * Convert loaded parent entities for menu items to an expected value format.
   *
   * @param \Drupal\yaml_content\Event\EntityPreSaveEvent $event
   *   The entity pre-save event containing data being processed.
   */
  public function serializeMenuParent(EntityPreSaveEvent $event) {
    $import_content = $event
      ->getContentData();

    // Stop here if we're not working with a menu link.
    if (empty($import_content['entity']) || $import_content['entity'] != 'menu_link_content') {
      return;
    }

    // Stop here if there is no parent link indicated in content.
    if (empty($import_content['parent'])) {
      return;
    }

    /** @var \Drupal\Core\Menu\MenuLinkInterface $entity */
    $entity = $event
      ->getEntity();
    $parent_value = $entity->parent
      ->first()->value;
    if ($parent_value instanceof MenuLinkContentInterface) {
      $entity
        ->set('parent', $parent_value
        ->getPluginId(), FALSE);
    }
  }

}

Members

Name	Modifiers	Type	Description	Overrides
MenuHierarchySubscriber::getSubscribedEvents	public static	function	Returns an array of event names this subscriber wants to listen to.
MenuHierarchySubscriber::serializeMenuParent	public	function	Convert loaded parent entities for menu items to an expected value format.