From f33e67433bb3a8e97ffc4fd039bfeac37ea7aced Mon Sep 17 00:00:00 2001
From: coolmic <hello@hardmode.fr>
Date: Mon, 9 Sep 2024 12:23:52 +0200
Subject: [PATCH] Resolve the 'Unknown property mappedBy' issue when the parent
 field is defined before the child field in a tree structure.

---
 src/Tree/Hydrator/ORM/TreeObjectHydrator.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Tree/Hydrator/ORM/TreeObjectHydrator.php b/src/Tree/Hydrator/ORM/TreeObjectHydrator.php
index cb16778419..4503b97259 100644
--- a/src/Tree/Hydrator/ORM/TreeObjectHydrator.php
+++ b/src/Tree/Hydrator/ORM/TreeObjectHydrator.php
@@ -249,7 +249,7 @@ protected function getChildrenField($entityClass)
             $associationMapping = $meta->getAssociationMapping($property->getName());
 
             // Make sure the association is mapped by the parent property
-            if ($associationMapping['mappedBy'] !== $this->parentField) {
+            if (!isset($associationMapping['mappedBy']) || $associationMapping['mappedBy'] !== $this->parentField) {
                 continue;
             }