From 3686e943193b541dbd8e0b36f4f94fdc0b273189 Mon Sep 17 00:00:00 2001
From: Seth Shaw <seth.shaw@unlv.edu>
Date: Fri, 24 Jun 2022 12:48:01 -0700
Subject: [PATCH] preserve arrays without @id (#62)

---
 src/Normalizer/NormalizerBase.php | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/Normalizer/NormalizerBase.php b/src/Normalizer/NormalizerBase.php
index 7de3f48..b8a40ac 100644
--- a/src/Normalizer/NormalizerBase.php
+++ b/src/Normalizer/NormalizerBase.php
@@ -102,12 +102,8 @@ protected static function deduplicateTypesAndReferences(array $array): array {
    */
   private static function deduplicateArrayOfIds(array $array): array {
     $temp_array = [];
-    if (!isset($array[0]['@id'])) {
-      // No @id key, so just return the original array.
-      return $array;
-    }
     foreach ($array as $val) {
-      if (array_search($val['@id'], array_column($temp_array, '@id')) === FALSE) {
+      if (!array_key_exists('@id', $val) || array_search($val['@id'], array_column($temp_array, '@id')) === FALSE) {
         $temp_array[] = $val;
       }
     }