Closes #19627: Object change migrators (#19628)

* Initial work on ObjectChange data migrations

* Fix migration bug

* Add migrators for MAC address assignments

* Update reverting kwarg; allow pop() to fail

* Cross-reference MAC address migrators

* Split migrator logic across migrations

* Add missing migrator

netbox/circuits/migrations/0047_circuittermination__termination.py

@@ -1,4 +1,5 @@
 import django.db.models.deletion
+from django.contrib.contenttypes.models import ContentType
 from django.db import migrations, models
 
 
@@ -49,3 +50,26 @@ class Migration(migrations.Migration):
         # Copy over existing site assignments
         migrations.RunPython(code=copy_site_assignments, reverse_code=migrations.RunPython.noop),
     ]
+
+
+def oc_circuittermination_termination(objectchange, reverting):
+    site_ct = ContentType.objects.get_by_natural_key('dcim', 'site').pk
+    provider_network_ct = ContentType.objects.get_by_natural_key('circuits', 'providernetwork').pk
+    for data in (objectchange.prechange_data, objectchange.postchange_data):
+        if data is None:
+            continue
+        if site_id := data.get('site'):
+            data.update({
+                'termination_type': site_ct,
+                'termination_id': site_id,
+            })
+        elif provider_network_id := data.get('provider_network'):
+            data.update({
+                'termination_type': provider_network_ct,
+                'termination_id': provider_network_id,
+            })
+
+
+objectchange_migrators = {
+    'circuits.circuittermination': oc_circuittermination_termination,
+}

netbox/circuits/migrations/0048_circuitterminations_cached_relations.py

@@ -86,3 +86,15 @@ class Migration(migrations.Migration):
             new_name='_provider_network',
         ),
     ]
+
+
+def oc_circuittermination_remove_fields(objectchange, reverting):
+    for data in (objectchange.prechange_data, objectchange.postchange_data):
+        if data is not None:
+            data.pop('site', None)
+            data.pop('provider_network', None)
+
+
+objectchange_migrators = {
+    'circuits.circuittermination': oc_circuittermination_remove_fields,
+}

netbox/circuits/migrations/0051_virtualcircuit_group_assignment.py

@@ -1,4 +1,5 @@
 import django.db.models.deletion
+from django.contrib.contenttypes.models import ContentType
 from django.db import migrations, models
 
 
@@ -82,3 +83,21 @@ class Migration(migrations.Migration):
             ),
         ),
     ]
+
+
+def oc_circuitgroupassignment_member(objectchange, reverting):
+    circuit_ct = ContentType.objects.get_by_natural_key('circuits', 'circuit').pk
+    for data in (objectchange.prechange_data, objectchange.postchange_data):
+        if data is None:
+            continue
+        if circuit_id := data.get('circuit'):
+            data.update({
+                'member_type': circuit_ct,
+                'member_id': circuit_id,
+            })
+        data.pop('circuit', None)
+
+
+objectchange_migrators = {
+    'circuits.circuitgroupassignment': oc_circuitgroupassignment_member,
+}