From 7301d286cc09e965fdbff48ff3899e45c8fd9f0e Mon Sep 17 00:00:00 2001
From: Linus Metzler <linus.metzler@cec.valantic.com>
Date: Wed, 17 Apr 2024 16:29:43 +0200
Subject: [PATCH] persist empty relation as null instead of omitting it from
 the ES document

---
 src/Document/DataObjectNormalizerTrait.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Document/DataObjectNormalizerTrait.php b/src/Document/DataObjectNormalizerTrait.php
index 16ab6df..72c7daf 100644
--- a/src/Document/DataObjectNormalizerTrait.php
+++ b/src/Document/DataObjectNormalizerTrait.php
@@ -128,6 +128,8 @@ protected function relationAttributes(Concrete $element, array $fields): array
             $data = is_callable($source) ? $source($element) : $element->get($source);
 
             if ($data === null) {
+                $result[$target] = null;
+
                 continue;
             }