Fixes #3574 - Change `device` to `parent` in interface edit form vlan filtering logic

CHANGELOG.md

@@ -1,5 +1,9 @@
 v2.6.6 (FUTURE)
 
+## Bug Fixes
+
+* [#3574](https://github.com/netbox-community/netbox/issues/3574) - Change `device` to `parent` in interface editing vlan filtering logic
+
 ## Enhancements
 
 * [#3259](https://github.com/netbox-community/netbox/issues/3259) - Add `rack` and `site` filters for cables

netbox/dcim/forms.py

@@ -2215,7 +2215,7 @@ class InterfaceForm(InterfaceCommonForm, BootstrapMixin, forms.ModelForm):
                 (group.name, [(vlan.pk, vlan) for vlan in global_group_vlans])
             )
 
-        site = getattr(self.instance.device, 'site', None)
+        site = getattr(self.instance.parent, 'site', None)
         if site is not None:
 
             # Add non-grouped site VLANs

netbox/virtualization/forms.py

@@ -670,7 +670,7 @@ class InterfaceForm(BootstrapMixin, forms.ModelForm):
                 (group.name, [(vlan.pk, vlan) for vlan in global_group_vlans])
             )
 
-        site = getattr(self.instance.device, 'site', None)
+        site = getattr(self.instance.parent, 'site', None)
         if site is not None:
 
             # Add non-grouped site VLANs