Introduce ObjectAttribute for displaying read-only instance attributes on forms

netbox/ipam/forms/model_forms.py

@@ -16,6 +16,7 @@ from utilities.forms.fields import (
     CommentField, ContentTypeChoiceField, DynamicModelChoiceField, DynamicModelMultipleChoiceField, NumericArrayField,
     SlugField,
 )
+from utilities.forms.rendering import ObjectAttribute
 from utilities.forms.widgets import DatePicker
 from virtualization.models import Cluster, ClusterGroup, VirtualMachine, VMInterface
 
@@ -502,6 +503,10 @@ class FHRPGroupAssignmentForm(forms.ModelForm):
         queryset=FHRPGroup.objects.all()
     )
 
+    fieldsets = (
+        (None, (ObjectAttribute('interface'), 'group', 'priority')),
+    )
+
     class Meta:
         model = FHRPGroupAssignment
         fields = ('group', 'priority')