Fixes #8951: Allow changing device type & platform to different manufacturer simultaneously

docs/release-notes/version-3.1.md

@@ -18,6 +18,7 @@
 * [#8924](https://github.com/netbox-community/netbox/issues/8924) - Improve load time of custom script list
 * [#8932](https://github.com/netbox-community/netbox/issues/8932) - Fix error when setting null value for interface `rf_role` via REST API
 * [#8935](https://github.com/netbox-community/netbox/issues/8935) - Correct ordering of next/previous racks to use naturalized names
+* [#8951](https://github.com/netbox-community/netbox/issues/8951) - Allow changing device type & platform to different manufacturer simultaneously
 
 ---
 

netbox/dcim/forms/models.py

@@ -605,11 +605,6 @@ class DeviceForm(TenancyForm, CustomFieldModelForm):
             # can be flipped from one face to another.
             self.fields['position'].widget.add_query_param('exclude', self.instance.pk)
 
-            # Limit platform by manufacturer
-            self.fields['platform'].queryset = Platform.objects.filter(
-                Q(manufacturer__isnull=True) | Q(manufacturer=self.instance.device_type.manufacturer)
-            )
-
             # Disable rack assignment if this is a child device installed in a parent device
             if self.instance.device_type.is_child_device and hasattr(self.instance, 'parent_bay'):
                 self.fields['site'].disabled = True

netbox/dcim/models/devices.py

@@ -739,8 +739,8 @@ class Device(PrimaryModel, ConfigContextModel):
         if hasattr(self, 'device_type') and self.platform:
             if self.platform.manufacturer and self.platform.manufacturer != self.device_type.manufacturer:
                 raise ValidationError({
-                    'platform': "The assigned platform is limited to {} device types, but this device's type belongs "
-                                "to {}.".format(self.platform.manufacturer, self.device_type.manufacturer)
+                    'platform': f"The assigned platform is limited to {self.platform.manufacturer} device types, but "
+                                f"this device's type belongs to {self.device_type.manufacturer}."
                 })
 
         # A Device can only be assigned to a Cluster in the same Site (or no Site)