11432 device field (#11567)

* 11432 make device field on interface read-only on api edit call

* 11432 make device field on interface read-only on api edit call

* 11432 extend serializer change to mixin

* 11432 add readonlydevicemixin to template serializers

* 11432 change subclass ordering

* 11432 fix device_type for template serializers

* 11432 DRY

* 11432 DRY

* 11432 make internal var

* 11432 change to model-level validation

* 11432 fix fk accessor

* Clean up validation error messages

---------

Co-authored-by: jeremystretch <jstretch@netboxlabs.com>

netbox/dcim/models/device_components.py

@@ -78,6 +78,12 @@ class ComponentModel(NetBoxModel):
             ),
         )
 
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        # Cache the original Device ID for reference under clean()
+        self._original_device = self.device_id
+
     def __str__(self):
         if self.label:
             return f"{self.name} ({self.label})"
@@ -88,6 +94,14 @@ class ComponentModel(NetBoxModel):
         objectchange.related_object = self.device
         return objectchange
 
+    def clean(self):
+        super().clean()
+
+        if self.pk is not None and self._original_device != self.device_id:
+            raise ValidationError({
+                "device": "Components cannot be moved to a different device."
+            })
+
     @property
     def parent_object(self):
         return self.device