From 0325d65d184f0193917cd1655b08f41a0e3e20e3 Mon Sep 17 00:00:00 2001
From: Siddharth Kumar Gope <siddharth8271skg2@gmail.com>
Date: Thu, 11 Sep 2025 23:28:37 +0530
Subject: [PATCH] fix(collections): Ensure unique IDs for new array rows in
 bulk updates

---
 .../src/collections/operations/update.ts      | 21 ++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/packages/payload/src/collections/operations/update.ts b/packages/payload/src/collections/operations/update.ts
index be735b4f1ce..2c1d2c20700 100644
--- a/packages/payload/src/collections/operations/update.ts
+++ b/packages/payload/src/collections/operations/update.ts
@@ -244,7 +244,26 @@ export const updateOperation = async <
           autosave: false,
           collectionConfig,
           config,
-          data: deepCopyObjectSimple(data),
+          data: (() => {
+            const dataForDoc = deepCopyObjectSimple(data)
+
+            collectionConfig.fields.forEach((field) => {
+              if (
+                field.type === 'array' &&
+                dataForDoc[field.name] &&
+                Array.isArray(dataForDoc[field.name])
+              ) {
+                dataForDoc[field.name].forEach((row: Record<string, any>) => {
+                  if (row.id && typeof row.id === 'string') {
+                    delete row.id
+                  }
+                })
+              }
+            })
+
+            return dataForDoc
+          })(),
+
           depth: depth!,
           docWithLocales,
           draftArg,