From 0181ff9d96a599f494e2462457b98d107c91296c Mon Sep 17 00:00:00 2001
From: cengiz <conkal@ciu.edu.tr>
Date: Wed, 26 Aug 2020 08:48:58 +0300
Subject: [PATCH] fix Collection.php linkNodes function use getParentId instead
 of parent_id and check if it is null

---
 src/Collection.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Collection.php b/src/Collection.php
index be592a8..a592ee2 100644
--- a/src/Collection.php
+++ b/src/Collection.php
@@ -21,7 +21,7 @@ public function linkNodes()
 
         /** @var Node $node */
         foreach ($this->items as $node) {
-            if (! $node->parent_id) {
+            if (is_null($node->getParentId())) {
                 $node->setRelation('parent', null);
             }