From c264b42abcf9b2d22b0d954e0dd24ca5f31692a5 Mon Sep 17 00:00:00 2001
From: Josh Niec <jniec@janestreet.com>
Date: Tue, 2 Jun 2026 18:37:24 -0400
Subject: [PATCH] fix: avoid problem when fields is set to '__all__'

---
 netbox/netbox/api/serializers/bulk.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/netbox/netbox/api/serializers/bulk.py b/netbox/netbox/api/serializers/bulk.py
index d6c1dda4b..1138eee9f 100644
--- a/netbox/netbox/api/serializers/bulk.py
+++ b/netbox/netbox/api/serializers/bulk.py
@@ -52,9 +52,17 @@ def get_bulk_update_serializer_class(serializer_class, *, partial=False):
 
     meta = getattr(serializer_class, 'Meta')
 
-    class Meta(meta):
+    if meta.fields == '__all__':
+        fields = '__all__'
+    else:
         fields = ('id', *[f for f in meta.fields if f != 'id'])
 
+    class Meta(meta):
+        pass
+
+    # intentional; this is different than setting fields = fields within class Meta above
+    Meta.fields = fields
+
     bases = (
         (BulkPartialUpdateSchemaMixin, serializer_class)
         if partial