Fixes #9682: Fix bulk assignment of ASNs to sites

Author: jeremystretch

docs/release-notes/version-3.2.md

@@ -14,6 +14,7 @@
 * [#8854](https://github.com/netbox-community/netbox/issues/8854) - Fix `REMOTE_AUTH_DEFAULT_GROUPS` for social-auth backends
 * [#9575](https://github.com/netbox-community/netbox/issues/9575) - Fix AttributeError exception for FHRP group with an IP address assigned
 * [#9597](https://github.com/netbox-community/netbox/issues/9597) - Include `installed_module` in module bay REST API serializer
+* [#9682](https://github.com/netbox-community/netbox/issues/9682) - Fix bulk assignment of ASNs to sites
 
 ---
 

netbox/netbox/views/generic/bulk_views.py

@@ -8,6 +8,7 @@
 from django.core.exceptions import FieldDoesNotExist, ValidationError
 from django.db import transaction, IntegrityError
 from django.db.models import ManyToManyField, ProtectedError
+from django.db.models.fields.reverse_related import ManyToManyRel
 from django.forms import Form, ModelMultipleChoiceField, MultipleHiddenInput
 from django.http import HttpResponse
 from django.shortcuts import get_object_or_404, redirect, render
@@ -484,7 +485,7 @@ def _update_objects(self, form, request):
                         setattr(obj, name, None if model_field.null else '')
 
                 # ManyToManyFields
-                elif isinstance(model_field, ManyToManyField):
+                elif isinstance(model_field, (ManyToManyField, ManyToManyRel)):
                     if form.cleaned_data[name]:
                         getattr(obj, name).set(form.cleaned_data[name])
                 # Normal fields