Adding field for listing all entity translations. (#506)

Author: fubhy

modules/graphql_core/src/Plugin/GraphQL/Fields/Entity/EntityTranslations.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Drupal\graphql_core\Plugin\GraphQL\Fields\Entity;
+
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\graphql\Plugin\GraphQL\Fields\FieldPluginBase;
+use Youshido\GraphQL\Execution\ResolveInfo;
+
+/**
+ * @GraphQLField(
+ *   id = "entity_translations",
+ *   name = "entityTranslations",
+ *   secure = true,
+ *   type = "[Entity]",
+ *   parents = {"Entity"}
+ * )
+ */
+class EntityTranslations extends FieldPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function resolveValues($value, array $args, ResolveInfo $info) {
+    if ($value instanceof ContentEntityInterface) {
+      $languages = $value->getTranslationLanguages();
+      foreach ($languages as $language) {
+        yield $value->getTranslation($language->getId());
+      }
+    }
+  }
+
+}