rebuild tree after rename

netbox/dcim/models/device_components.py

@@ -1273,7 +1273,7 @@ class ModuleBay(ModularComponentModel, TrackingModelMixin, MPTTModel):
         verbose_name_plural = _('module bays')
 
     class MPTTMeta:
-        order_insertion_by = ('module',)
+        order_insertion_by = ('module', 'name',)
 
     def clean(self):
         super().clean()

netbox/dcim/models/modules.py

@@ -343,10 +343,14 @@ class Module(TrackingModelMixin, PrimaryModel, ConfigContextModel):
                     )
             else:
                 # ModuleBays must be saved individually for MPTT
+                # Use delay_mptt_updates for better performance when creating multiple ModuleBays
+                with ModuleBay.objects.delay_mptt_updates():
                     for instance in create_instances:
                         instance.save()
 
             update_fields = ['module']
+
+            if component_model is not ModuleBay:
                 component_model.objects.bulk_update(update_instances, update_fields)
                 # Emit the post_save signal for each updated object
                 for component in update_instances:
@@ -358,6 +362,23 @@ class Module(TrackingModelMixin, PrimaryModel, ConfigContextModel):
                         using='default',
                         update_fields=update_fields
                     )
+            else:
+                # ModuleBays must be saved individually to maintain MPTT tree structure
+                # Use delay_mptt_updates for better performance
+                with ModuleBay.objects.delay_mptt_updates():
+                    for component in update_instances:
+                        component.save()
+                        post_save.send(
+                            sender=component_model,
+                            instance=component,
+                            created=False,
+                            raw=False,
+                            using='default',
+                            update_fields=update_fields
+                        )
+                # Rebuild the tree once to apply order_insertion_by after all operations
+                if create_instances or update_instances:
+                    ModuleBay.objects.rebuild()
 
         # Interface bridges have to be set after interface instantiation
         update_interface_bridges(self.device, self.module_type.interfacetemplates, self)

netbox/netbox/views/generic/bulk_views.py

@@ -895,6 +895,15 @@ class BulkRenameView(GetReturnURLMixin, BaseMultiObjectView):
                         renamed_pks = self._rename_objects(form, selected_objects)
 
                         if '_apply' in request.POST:
+                            # For MPTT models, delay tree updates until all saves are complete
+                            if issubclass(self.queryset.model, MPTTModel):
+                                with self.queryset.model.objects.delay_mptt_updates():
+                                    for obj in selected_objects:
+                                        setattr(obj, self.field_name, obj.new_name)
+                                        obj.save()
+                                # Rebuild the tree to apply order_insertion_by after renaming
+                                self.queryset.model.objects.rebuild()
+                            else:
                                 for obj in selected_objects:
                                     setattr(obj, self.field_name, obj.new_name)
                                     obj.save()