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/ipam/migrations/0071_prefix_scope.py

@@ -1,4 +1,5 @@
 import django.db.models.deletion
+from django.contrib.contenttypes.models import ContentType
 from django.db import migrations, models
 
 
@@ -44,3 +45,20 @@ class Migration(migrations.Migration):
         # Copy over existing site assignments
         migrations.RunPython(code=copy_site_assignments, reverse_code=migrations.RunPython.noop),
     ]
+
+
+def oc_prefix_scope(objectchange, reverting):
+    site_ct = ContentType.objects.get_by_natural_key('dcim', 'site').pk
+    for data in (objectchange.prechange_data, objectchange.postchange_data):
+        if data is None:
+            continue
+        if site_id := data.get('site'):
+            data.update({
+                'scope_type': site_ct,
+                'scope_id': site_id,
+            })
+
+
+objectchange_migrators = {
+    'ipam.prefix': oc_prefix_scope,
+}

netbox/ipam/migrations/0072_prefix_cached_relations.py

@@ -60,3 +60,14 @@ class Migration(migrations.Migration):
             name='site',
         ),
     ]
+
+
+def oc_prefix_remove_fields(objectchange, reverting):
+    for data in (objectchange.prechange_data, objectchange.postchange_data):
+        if data is not None:
+            data.pop('site', None)
+
+
+objectchange_migrators = {
+    'ipam.prefix': oc_prefix_remove_fields,
+}

netbox/ipam/migrations/0080_populate_service_parent.py

@@ -1,3 +1,4 @@
+from django.contrib.contenttypes.models import ContentType
 from django.db import migrations
 from django.db.models import F
 
@@ -54,3 +55,26 @@ class Migration(migrations.Migration):
                 reverse_code=repopulate_device_and_virtualmachine_relations,
             )
     ]
+
+
+def oc_service_parent(objectchange, reverting):
+    device_ct = ContentType.objects.get_by_natural_key('dcim', 'device').pk
+    virtual_machine_ct = ContentType.objects.get_by_natural_key('virtualization', 'virtualmachine').pk
+    for data in (objectchange.prechange_data, objectchange.postchange_data):
+        if data is None:
+            continue
+        if device_id := data.get('device'):
+            data.update({
+                'parent_object_type': device_ct,
+                'parent_object_id': device_id,
+            })
+        elif virtual_machine_id := data.get('virtual_machine'):
+            data.update({
+                'parent_object_type': virtual_machine_ct,
+                'parent_object_id': virtual_machine_id,
+            })
+
+
+objectchange_migrators = {
+    'ipam.service': oc_service_parent,
+}

netbox/ipam/migrations/0081_remove_service_device_virtual_machine_add_parent_gfk_index.py

@@ -37,3 +37,15 @@ class Migration(migrations.Migration):
             ),
         ),
     ]
+
+
+def oc_service_remove_fields(objectchange, reverting):
+    for data in (objectchange.prechange_data, objectchange.postchange_data):
+        if data is not None:
+            data.pop('device', None)
+            data.pop('virtual_machine', None)
+
+
+objectchange_migrators = {
+    'ipam.service': oc_service_remove_fields,
+}