Fixes #8102 - Add validation around assigned objects

docs/release-notes/version-3.1.md

@@ -22,6 +22,7 @@
 * [#8088](https://github.com/netbox-community/netbox/issues/8088) - Improve legibility of text in labels with light-colored backgrounds
 * [#8092](https://github.com/netbox-community/netbox/issues/8092) - Rack elevations should not include device asset tags
 * [#8096](https://github.com/netbox-community/netbox/issues/8096) - Fix DataError during change logging of objects with very long string representations
+* [#8102](https://github.com/netbox-community/netbox/issues/8102) - Cause validation error when editing IPAddress when more than one object is selected for assignment 
 
 ---
 

netbox/ipam/forms/models.py

@@ -461,6 +461,20 @@ class IPAddressForm(TenancyForm, CustomFieldModelForm):
     def clean(self):
         super().clean()
 
+        if self.cleaned_data['interface'] and self.cleaned_data['vminterface'] and self.cleaned_data['fhrpgroup']:
+            self.add_error('interface', "Can only assign an interface, VM interface or FHRP group")
+            self.add_error('vminterface', "Can only assign an interface, VM interface or FHRP group")
+            self.add_error('fhrpgroup', "Can only assign an interface, VM interface or FHRP group")
+        elif self.cleaned_data['interface'] and self.cleaned_data['vminterface']:
+            self.add_error('interface', "Can only assign an interface or VM interface")
+            self.add_error('vminterface', "Can only assign an interface or VM interface")
+        elif self.cleaned_data['interface'] and self.cleaned_data['fhrpgroup']:
+            self.add_error('interface', "Can only assign an interface or FHRP group")
+            self.add_error('fhrpgroup', "Can only assign an interface or FHRP group")
+        elif self.cleaned_data['vminterface'] and self.cleaned_data['fhrpgroup']:
+            self.add_error('vminterface', "Can only assign an VM interface or FHRP group")
+            self.add_error('fhrpgroup', "Can only assign an VM interface or FHRP group")
+
         # Handle object assignment
         if self.cleaned_data['interface']:
             self.instance.assigned_object = self.cleaned_data['interface']