From 1ed66aae2f61e63130a2f32e65a66900a5120897 Mon Sep 17 00:00:00 2001
From: Sasha <64744993+r1tsuu@users.noreply.github.com>
Date: Mon, 21 Oct 2024 15:51:26 +0300
Subject: [PATCH] fix(ui): unique ids for nested rows on row duplicate to
 prevent errors with postgres (#8790)

Fixes https://github.com/payloadcms/payload/issues/8784

This works for any deep level, both arrays and blocks.
---
 .../src/admin/components/forms/Form/fieldReducer.ts      | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/packages/payload/src/admin/components/forms/Form/fieldReducer.ts b/packages/payload/src/admin/components/forms/Form/fieldReducer.ts
index 2ac8c143883..6e7ae670363 100644
--- a/packages/payload/src/admin/components/forms/Form/fieldReducer.ts
+++ b/packages/payload/src/admin/components/forms/Form/fieldReducer.ts
@@ -228,6 +228,15 @@ export function fieldReducer(state: Fields, action: FieldAction): Fields {
       const duplicateRowState = deepCopyObject(rows[rowIndex])
       if (duplicateRowState.id) duplicateRowState.id = new ObjectID().toHexString()
 
+      for (const key of Object.keys(duplicateRowState).filter((key) => key.endsWith('.id'))) {
+        const idState = duplicateRowState[key]
+
+        if (idState && typeof idState.value === 'string' && ObjectId.isValid(idState.value)) {
+          duplicateRowState[key].value = new ObjectId().toHexString()
+          duplicateRowState[key].initialValue = new ObjectId().toHexString()
+        }
+      }
+
       // If there are subfields
       if (Object.keys(duplicateRowState).length > 0) {
         // Add new object containing subfield names to unflattenedRows array