From a42cd4378042a0b8ea416a079f20b3f57470e15b Mon Sep 17 00:00:00 2001
From: Niklas Forsdahl <niklas@creamarketing.com>
Date: Wed, 15 May 2024 09:03:32 +0300
Subject: [PATCH] Only allow one GridFieldNestedForm component per GridField.

---
 src/GridFieldNestedForm.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/GridFieldNestedForm.php b/src/GridFieldNestedForm.php
index cb3015c..9f4fffc 100644
--- a/src/GridFieldNestedForm.php
+++ b/src/GridFieldNestedForm.php
@@ -207,6 +207,9 @@ class GridFieldNestedForm extends AbstractGridFieldComponent implements
 
     public function getColumnContent($gridField, $record, $columnName)
     {
+        if ($gridField->getConfig()->getComponentsByType(GridFieldNestedForm::class)->count() > 1) {
+            throw new Exception('Only one GridFieldNestedForm component allowed per GridField');
+        }
         if ($this->atMaxNestingLevel($gridField)) {
             return '';
         }