Fixes #10969: Update cable paths ending at associated rear port when creating new front ports

docs/release-notes/version-3.3.md

@@ -14,6 +14,7 @@
 * [#10236](https://github.com/netbox-community/netbox/issues/10236) - Fix TypeError exception when viewing PDU configured for three-phase power
 * [#10579](https://github.com/netbox-community/netbox/issues/10579) - Mark cable traces terminating to a provider network as complete
 * [#10721](https://github.com/netbox-community/netbox/issues/10721) - Disable ordering by custom object field columns
+* [#10969](https://github.com/netbox-community/netbox/issues/10969) - Update cable paths ending at associated rear port when creating new front ports
 
 ---
 

netbox/dcim/signals.py

@@ -4,7 +4,9 @@ from django.db.models.signals import post_save, post_delete, pre_delete
 from django.dispatch import receiver
 
 from .choices import CableEndChoices, LinkStatusChoices
-from .models import Cable, CablePath, CableTermination, Device, PathEndpoint, PowerPanel, Rack, Location, VirtualChassis
+from .models import (
+    Cable, CablePath, CableTermination, Device, FrontPort, PathEndpoint, PowerPanel, Rack, Location, VirtualChassis,
+)
 from .models.cables import trace_paths
 from .utils import create_cablepath, rebuild_paths
 
@@ -123,3 +125,14 @@ def nullify_connected_endpoints(instance, **kwargs):
 
     for cablepath in CablePath.objects.filter(_nodes__contains=instance.cable):
         cablepath.retrace()
+
+
+@receiver(post_save, sender=FrontPort)
+def extend_rearport_cable_paths(instance, created, **kwargs):
+    """
+    When a new FrontPort is created, add it to any CablePaths which end at its corresponding RearPort.
+    """
+    if created:
+        rearport = instance.rear_port
+        for cablepath in CablePath.objects.filter(_nodes__contains=rearport):
+            cablepath.retrace()