getResourceLinks example

  protected function getExpectedCollectionResponse(array $collection, $self_link, array $request_options, array $included_paths = NULL, $filtered = FALSE) {
    $resource_identifiers = array_map([static::class, 'toResourceIdentifier'], $collection);
    $individual_responses = static::toResourceResponses($this->getResponses(static::getResourceLinks($resource_identifiers), $request_options));
    $merged_response = static::toCollectionResourceResponse($individual_responses, $self_link, TRUE);

    $merged_document = $merged_response->getResponseData();
    if (!isset($merged_document['data'])) {
      $merged_document['data'] = [];
    }

    $cacheability = static::getExpectedCollectionCacheability($this->account, $collection, NULL, $filtered);
    $cacheability->setCacheMaxAge($merged_response->getCacheableMetadata()->getCacheMaxAge());

    $collection_response = new CacheableResourceResponse($merged_document);