Introduced 'cable' field on CableTermination to cache connected Cable

netbox/dcim/models.py

@@ -66,6 +66,12 @@ class ComponentModel(models.Model):
 
 
 class CableTermination(models.Model):
+    cable = models.ForeignKey(
+        to='dcim.Cable',
+        on_delete=models.SET_NULL,
+        blank=True,
+        null=True
+    )
 
     class Meta:
         abstract = True
@@ -2339,6 +2345,12 @@ class Cable(ChangeLoggedModel):
 
         super(Cable, self).save(*args, **kwargs)
 
+        # Cache the Cable on its two termination points
+        self.termination_a.cable = self
+        self.termination_a.save()
+        self.termination_b.cable = self
+        self.termination_b.save()
+
     def get_path_endpoints(self):
         """
         Traverse both ends of a cable path and return its connected endpoints. Note that one or both endpoints may be