Set the default langcode for the translation manager and the configuration language for the language manager when executing a callable in a language context. (#809)

Author: chindris

graphql.services.yml

@@ -266,7 +266,7 @@ services:
 
   graphql.language_context:
     class: Drupal\graphql\GraphQLLanguageContext
-    arguments: ['@language_manager']
+    arguments: ['@language_manager', '@string_translation']
 
   graphql.config_factory_override:
     class: Drupal\graphql\Config\GraphQLConfigOverrides

modules/graphql_core/src/Plugin/GraphQL/Fields/Menu/MenuByName.php

@@ -3,9 +3,8 @@
 namespace Drupal\graphql_core\Plugin\GraphQL\Fields\Menu;
 
 use Drupal\Core\DependencyInjection\DependencySerializationTrait;
-use Drupal\Core\Entity\EntityType;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
-use Drupal\Core\Entity\TranslatableInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Drupal\graphql\GraphQL\Execution\ResolveContext;
 use Drupal\graphql\Plugin\GraphQL\Fields\FieldPluginBase;
@@ -71,12 +70,6 @@ public function resolveValues($value, array $args, ResolveContext $context, Reso
     $entity = $this->entityTypeManager->getStorage('menu')->load($args['name']);
 
     if ($entity instanceof MenuInterface) {
-      if (isset($args['language']) && $args['language'] != $entity->language()->getId() && $entity instanceof TranslatableInterface && $entity->isTranslatable()) {
-        if ($entity->hasTranslation($args['language'])) {
-          $entity = $entity->getTranslation($args['language']);
-        }
-      }
-
       yield $entity;
     }
   }

modules/graphql_core/src/Plugin/GraphQL/Fields/MenuLink/MenuLinkDescription.php

@@ -15,7 +15,8 @@
  *   secure = true,
  *   name = "description",
  *   type = "String",
- *   parents = {"MenuLink"}
+ *   parents = {"MenuLink"},
+ *   response_cache_contexts = {"languages:language_interface"}
  * )
  */
 class MenuLinkDescription extends FieldPluginBase {

modules/graphql_core/src/Plugin/GraphQL/Fields/MenuLink/MenuLinkLabel.php

@@ -15,7 +15,8 @@
  *   secure = true,
  *   name = "label",
  *   type = "String",
- *   parents = {"MenuLink"}
+ *   parents = {"MenuLink"},
+ *   response_cache_contexts = {"languages:language_interface"}
  * )
  */
 class MenuLinkLabel extends FieldPluginBase {

src/GraphQLLanguageContext.php

@@ -2,7 +2,9 @@
 
 namespace Drupal\graphql;
 
+use Drupal\Core\Language\LanguageDefault;
 use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\Core\StringTranslation\TranslationManager;
 
 /**
  * Simple service that stores the current GraphQL language state.
@@ -35,14 +37,22 @@ class GraphQLLanguageContext {
    */
   protected $languageManager;
 
+  /**
+   * The string translation service
+   *
+   * @var \Drupal\Core\StringTranslation\TranslationManager
+   */
+  protected $translationManager;
+
   /**
    * GraphQLLanguageContext constructor.
    *
    * @param \Drupal\Core\Language\LanguageManagerInterface $languageManager
    *   The language manager service.
    */
-  public function __construct(LanguageManagerInterface $languageManager) {
+  public function __construct(LanguageManagerInterface $languageManager, TranslationManager $translationManager) {
     $this->languageManager = $languageManager;
+    $this->translationManager = $translationManager;
     $this->languageStack = new \SplStack();
   }
 
@@ -77,6 +87,16 @@ public function executeInLanguageContext(callable $callable, $language) {
     $this->currentLanguage = $language;
     $this->isActive = TRUE;
     $this->languageManager->reset();
+    // This is needed to be able to use the string translation with the
+    // requested language.
+    $this->translationManager->setDefaultLangcode($language);
+    // Override the configuration language so that config entities (like menus)
+    // are loaded using the proper translation.
+    $currentConfigLanguage = $this->languageManager->getConfigOverrideLanguage();
+    if ($currentConfigLanguage->getId() !== $language) {
+      $configLanguage = $this->languageManager->getLanguage($language);
+      $this->languageManager->setConfigOverrideLanguage($configLanguage);
+    }
     // Extract the result array.
     try {
       return call_user_func($callable);
@@ -89,6 +109,12 @@ public function executeInLanguageContext(callable $callable, $language) {
       $this->currentLanguage = $this->languageStack->pop();
       $this->isActive = FALSE;
       $this->languageManager->reset();
+      // Restore the languages for the translation and language managers.
+      $defaultLangcode = !empty($this->currentLanguage)
+        ? $this->currentLanguage
+        : $this->languageManager->getDefaultLanguage()->getId();
+      $this->translationManager->setDefaultLangcode($defaultLangcode);
+      $this->languageManager->setConfigOverrideLanguage($currentConfigLanguage);
     }
   }