Chris@14: <?php
Chris@14: 
Chris@14: namespace Drupal\Core\Entity;
Chris@14: 
Chris@14: /**
Chris@14:  * Provides helper methods to detect changes in an entity object.
Chris@14:  *
Chris@14:  * @internal This may be replaced by a proper entity comparison handler.
Chris@14:  */
Chris@14: trait EntityChangesDetectionTrait {
Chris@14: 
Chris@14:   /**
Chris@14:    * Returns an array of field names to skip when checking for changes.
Chris@14:    *
Chris@14:    * @param \Drupal\Core\Entity\ContentEntityInterface $entity
Chris@14:    *   A content entity object.
Chris@14:    *
Chris@14:    * @return string[]
Chris@14:    *   An array of field names.
Chris@14:    */
Chris@14:   protected function getFieldsToSkipFromTranslationChangesCheck(ContentEntityInterface $entity) {
Chris@14:     /** @var \Drupal\Core\Entity\ContentEntityTypeInterface $entity_type */
Chris@14:     $entity_type = $entity->getEntityType();
Chris@14: 
Chris@14:     // A list of known revision metadata fields which should be skipped from
Chris@14:     // the comparision.
Chris@14:     $fields = [
Chris@14:       $entity_type->getKey('revision'),
Chris@14:       $entity_type->getKey('revision_translation_affected'),
Chris@14:     ];
Chris@14:     $fields = array_merge($fields, array_values($entity_type->getRevisionMetadataKeys()));
Chris@14: 
Chris@17:     // Computed fields should be skipped by the check for translation changes.
Chris@17:     foreach (array_diff_key($entity->getFieldDefinitions(), array_flip($fields)) as $field_name => $field_definition) {
Chris@17:       if ($field_definition->isComputed()) {
Chris@17:         $fields[] = $field_name;
Chris@17:       }
Chris@17:     }
Chris@17: 
Chris@14:     return $fields;
Chris@14:   }
Chris@14: 
Chris@14: }