From 1092b8cd1ec605833a8c72220440e698f1248bdc Mon Sep 17 00:00:00 2001
From: Arthur <worldnomad@gmail.com>
Date: Mon, 5 Feb 2024 10:37:01 -0800
Subject: [PATCH] 15029 check if duplicate FHRP group assignment

---
 netbox/ipam/forms/model_forms.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/netbox/ipam/forms/model_forms.py b/netbox/ipam/forms/model_forms.py
index 34b7c5958fc..2241cf92a48 100644
--- a/netbox/ipam/forms/model_forms.py
+++ b/netbox/ipam/forms/model_forms.py
@@ -521,6 +521,24 @@ def __init__(self, *args, **kwargs):
         for ipaddress in ipaddresses:
             self.fields['group'].widget.add_query_param('related_ip', ipaddress.pk)
 
+    def clean_group(self):
+        group = self.cleaned_data['group']
+
+        conflicting_assignments = FHRPGroupAssignment.objects.filter(
+            interface_type=self.instance.interface_type,
+            interface_id=self.instance.interface_id,
+            group=group
+        )
+        if self.instance.id:
+            conflicting_assignments = conflicting_assignments.exclude(id=self.instance.id)
+
+        if conflicting_assignments.exists():
+            raise forms.ValidationError(
+                _('Assignment already exists')
+            )
+
+        return group
+
 
 class VLANGroupForm(NetBoxModelForm):
     scope_type = ContentTypeChoiceField(