Dynamically creating menu items

Question

What I need is to add menu item to some menu, but it should have different parameters (title and url) depending on language. So I created new module and added links.menu.yml like:

my_menu_item_id:
  title: 'Dummy Title'
  description: 'Dummy Description'
  url: http://www.google.com
  parent: mainmenu
  menu_name: mainmenu
  weight: -100

And item appears well. Then I added menu_links_discovered_alter hook like:

    function mymodule_menu_links_discovered_alter(&$links) {
      $language = \Drupal::languageManager()->getCurrentLanguage()->getId();
      $links['my_menu_item_id']['title'] = 'Title:'.$language;
    }

And title really get's altered, but that renaming is cached. So when I visit some page in other language previous title remains until I clear the cache. How to solve this. How to make Drupal execute this code with every page instead of using cached value?

Answer 1

The discovery process is not the right place for dynamic behavior. A menu link defined statically in a yaml file can provide dynamic values only in a menu link plugin class.

In your case you would implement the method MenuLinkInterface::getTitle:

  public function getTitle() {
    return $title;
  }

See this answer https://drupal.stackexchange.com/a/249342/47547 for a complete example of a menu link class.

Although for translating the title this should not be necessary, titles of routes and menu links are covered by interface translation, see Translate routing and menu titles