Fixes #5913: Improve change logging (#5924)

* Initial work on #5913
* Provide per-line diff highlighting
* BulkDeteView should delete objects individually to secure a pre-change snapshot
* Add changelog tests for bulk operations

netbox/circuits/models.py

@@ -6,9 +6,8 @@ from dcim.fields import ASNField
 from dcim.models import CableTermination, PathEndpoint
 from extras.models import ObjectChange, TaggedItem
 from extras.utils import extras_features
-from netbox.models import BigIDModel, OrganizationalModel, PrimaryModel
+from netbox.models import BigIDModel, ChangeLoggingMixin, OrganizationalModel, PrimaryModel
 from utilities.querysets import RestrictedQuerySet
-from utilities.utils import serialize_object
 from .choices import *
 from .querysets import CircuitQuerySet
 
@@ -235,7 +234,7 @@ class Circuit(PrimaryModel):
         return self._get_termination('Z')
 
 
-class CircuitTermination(BigIDModel, PathEndpoint, CableTermination):
+class CircuitTermination(ChangeLoggingMixin, BigIDModel, PathEndpoint, CableTermination):
     circuit = models.ForeignKey(
         to='circuits.Circuit',
         on_delete=models.CASCADE,
@@ -289,18 +288,11 @@ class CircuitTermination(BigIDModel, PathEndpoint, CableTermination):
     def to_objectchange(self, action):
         # Annotate the parent Circuit
         try:
-            related_object = self.circuit
+            circuit = self.circuit
         except Circuit.DoesNotExist:
             # Parent circuit has been deleted
-            related_object = None
-
-        return ObjectChange(
-            changed_object=self,
-            object_repr=str(self),
-            action=action,
-            related_object=related_object,
-            object_data=serialize_object(self)
-        )
+            circuit = None
+        return super().to_objectchange(action, related_object=circuit)
 
     @property
     def parent(self):