Issue #3203188 by yoerioptr, beltofte: Search API compatibility

src/Plugin/search_api/datasource/ContentEntityFallback.php

@@ -6,7 +6,9 @@ use Drupal\Core\Entity\ContentEntityInterface;
 use Drupal\entity_language_fallback\FallbackControllerInterface;
 use Drupal\language\Entity\ConfigurableLanguage;
 use Drupal\search_api\Entity\Index;
+use Drupal\search_api\IndexInterface;
 use Drupal\search_api\Plugin\search_api\datasource\ContentEntity;
+use Drupal\search_api\Plugin\search_api\datasource\ContentEntityTrackingManager;
 use Drupal\search_api\Utility\Utility;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -187,4 +189,35 @@ class ContentEntityFallback extends ContentEntity {
     $this->fallbackController = $controller;
   }
 
+  /**
+   * Filters a set of datasource-specific item IDs.
+   *
+   * Returns only those item IDs that are valid for the given datasource and
+   * index. This method only checks the item language, though – whether an
+   * entity with that ID actually exists, or whether it has a bundle included
+   * for that datasource, is not verified.
+   *
+   * Note: ContentEntity::filterValidItemIds() is deprecated in Search API
+   * and the "wrapper"-method is only implemented here as a backwards
+   * compatability solution.
+   *
+   * @param \Drupal\search_api\IndexInterface $index
+   *   The index for which to validate.
+   * @param string $datasource_id
+   *   The ID of the datasource on the index for which to validate.
+   * @param string[] $item_ids
+   *   The item IDs to be validated.
+   *
+   * @return string[]
+   *   All given item IDs that are valid for that index and datasource.
+   */
+  public static function filterValidItemIds(IndexInterface $index, $datasource_id, array $item_ids) {
+    if (method_exists(ContentEntityTrackingManager::class, 'filterValidItemIds')) {
+      return ContentEntityTrackingManager::filterValidItemIds($index, $datasource_id, $item_ids);
+    }
+    else {
+      return ContentEntity::filterValidItemIds($index, $datasource_id, $item_ids);
+    }
+  }
+
 }