I have a custom block which displays the number of events added to favorites(Flag module). I am using the TWIG template to display those results. I want to refresh the block contents right after the user flags/unflags a node. Currently I can only get the updated value if I reload the page.

The build() looks like this:

class FavoritesBlock extends BlockBase

   * {@inheritdoc}
  public function getCacheMaxAge()
    return 0;

  public function build()

    $uid = \Drupal::currentUser();
    if ($uid->isAuthenticated()) {
      $flag = \Drupal::service('flag')->getFlagById('favorites');
      $count = \Drupal::service('flag.count')->getUserFlagFlaggingCount($flag, $uid);

      $test = "Events added to favorites: " . $count;
      $link_url = Url::fromUri("https://my-site/my-favorite-events");

    $text = Link::fromTextAndUrl(t($test), $link_url)->toString();

    return [
      '#markup' => $text,
      '#cache' => array(

        'tags' => ['config:node_type_list'],
        'max-age' => 0,

I also came upon the EventSubscriber which seems to be triggered exactly when I want, meaning on flagging/unflagging but I don't know if it is useful in this situation, I haven't much experience.

How could automatic block reload be achieved?


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