Invalidate the user_role:farm_account_admin cache tag when the account admin settings form is submitted.

modules/core/role/modules/account_admin/src/Form/AccountAdminSettingsForm.php

@@ -2,8 +2,11 @@
 
 namespace Drupal\farm_role_account_admin\Form;
 
+use Drupal\Core\Cache\CacheTagsInvalidatorInterface;
+use Drupal\Core\Config\ConfigFactoryInterface;
 use Drupal\Core\Form\ConfigFormBase;
 use Drupal\Core\Form\FormStateInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Provides a settings form for the Account Admin Role module.
@@ -17,6 +20,36 @@ class AccountAdminSettingsForm extends ConfigFormbase {
    */
   const SETTINGS = 'farm_role_account_admin.settings';
 
+  /**
+   * The cache tags invalidator.
+   *
+   * @var \Drupal\Core\Cache\CacheTagsInvalidatorInterface
+   */
+  protected $cacheTagsInvalidator;
+
+  /**
+   * Constructs a \Drupal\system\ConfigFormBase object.
+   *
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The factory for configuration objects.
+   * @param \Drupal\Core\Cache\CacheTagsInvalidatorInterface $cache_tags_invalidator
+   *   The cache tags invalidator.
+   */
+  public function __construct(ConfigFactoryInterface $config_factory, CacheTagsInvalidatorInterface $cache_tags_invalidator) {
+    $this->setConfigFactory($config_factory);
+    $this->cacheTagsInvalidator = $cache_tags_invalidator;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('config.factory'),
+      $container->get('cache_tags.invalidator'),
+    );
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -57,6 +90,9 @@ class AccountAdminSettingsForm extends ConfigFormbase {
       ->set('allow_peer_role_assignment', $form_state->getValue('allow_peer_role_assignment'))
       ->save();
 
+    // Invalidate the user_role:farm_account_admin cache tag.
+    $this->cacheTagsInvalidator->invalidateTags(['user_role:farm_account_admin']);
+
     parent::submitForm($form, $form_state);
   }