collectionHasResourceIdentifier example

          $collected_responses[] = static::getAccessDeniedResponse($entity, $field_access, $via_link, $field_name, 'The current user is not allowed to view this relationship.', $field_name);
          break;
        }
        if ($target_entity = $entity->{$field_name}->entity) {
          $target_access = static::entityAccess($target_entity, 'view', $this->account);
          if (!$target_access->isAllowed()) {
            $target_access = static::entityAccess($target_entity, 'view label', $this->account)->addCacheableDependency($target_access);
          }
          if (!$target_access->isAllowed()) {
            $resource_identifier = static::toResourceIdentifier($target_entity);
            if (!static::collectionHasResourceIdentifier($resource_identifier, $data['already_checked'])) {
              $data['already_checked'][] = $resource_identifier;
              $via_link = Url::fromRoute(
                sprintf('jsonapi.%s.individual', $resource_identifier['type']),
                ['entity' => $resource_identifier['id']]
              );
              $collected_responses[] = static::getAccessDeniedResponse($entity, $target_access, $via_link, NULL, NULL, '/data');
            }
            break;
          }
        }
        $psr_responses = $this->getResponses([static::getRelatedLink(static::toResourceIdentifier($entity), $public_field_name)], $request_options);
        

static::addOmittedObject($expected_document, static::errorsToOmittedObject($related_document['errors']));
      }
      if (!empty($related_document['meta']['omitted'])) {
        static::addOmittedObject($expected_document, $related_document['meta']['omitted']);
      }
      if (isset($related_document['data'])) {
        $related_data = $related_document['data'];
        $related_resources = (static::isResourceIdentifier($related_data))
          ? [$related_data]
          : $related_data;
        foreach ($related_resources as $related_resource) {
          if (empty($expected_document['included']) || !static::collectionHasResourceIdentifier($related_resource, $expected_document['included'])) {
            $expected_document['included'][] = $related_resource;
          }
        }
      }
    }
    return (new CacheableResourceResponse($expected_document))->addCacheableDependency($expected_cacheability);
  }

  /** * Gets the expected individual ResourceResponse for GET. * * @return \Drupal\jsonapi\CacheableResourceResponse * The expected individual ResourceResponse. */