Fixes #5583: Eliminate redundant change records when adding/removing tags

docs/release-notes/version-2.11.md

@@ -13,6 +13,7 @@
 
 ### Bug Fixes (from Beta)
 
+* [#5583](https://github.com/netbox-community/netbox/issues/5583) - Eliminate redundant change records when adding/removing tags
 * [#6100](https://github.com/netbox-community/netbox/issues/6100) - Fix VM interfaces table "add interfaces" link
 * [#6104](https://github.com/netbox-community/netbox/issues/6104) - Fix location column on racks table
 * [#6105](https://github.com/netbox-community/netbox/issues/6105) - Hide checkboxes for VMs under cluster VMs view

netbox/extras/signals.py

@@ -22,23 +22,35 @@ def _handle_changed_object(request, sender, instance, **kwargs):
     """
     Fires when an object is created or updated.
     """
-    # Queue the object for processing once the request completes
+    m2m_changed = False
+
+    # Determine the type of change being made
     if kwargs.get('created'):
         action = ObjectChangeActionChoices.ACTION_CREATE
     elif 'created' in kwargs:
         action = ObjectChangeActionChoices.ACTION_UPDATE
     elif kwargs.get('action') in ['post_add', 'post_remove'] and kwargs['pk_set']:
         # m2m_changed with objects added or removed
+        m2m_changed = True
         action = ObjectChangeActionChoices.ACTION_UPDATE
     else:
         return
 
     # Record an ObjectChange if applicable
     if hasattr(instance, 'to_objectchange'):
-        objectchange = instance.to_objectchange(action)
+        if m2m_changed:
-        objectchange.user = request.user
+            ObjectChange.objects.filter(
-        objectchange.request_id = request.id
+                changed_object_type=ContentType.objects.get_for_model(instance),
-        objectchange.save()
+                changed_object_id=instance.pk,
+                request_id=request.id
+            ).update(
+                postchange_data=instance.to_objectchange(action).postchange_data
+            )
+        else:
+            objectchange = instance.to_objectchange(action)
+            objectchange.user = request.user
+            objectchange.request_id = request.id
+            objectchange.save()
 
     # Enqueue webhooks
     enqueue_webhooks(instance, request.user, request.id, action)

netbox/extras/tests/test_changelog.py

@@ -56,19 +56,18 @@ class ChangeLogViewTest(ModelViewTestCase):
         response = self.client.post(**request)
         self.assertHttpStatus(response, 302)
 
+        # Verify the creation of a new ObjectChange record
         site = Site.objects.get(name='Site 1')
-        # First OC is the creation; second is the tags update
+        oc = ObjectChange.objects.get(
-        oc_list = ObjectChange.objects.filter(
             changed_object_type=ContentType.objects.get_for_model(Site),
             changed_object_id=site.pk
-        ).order_by('pk')
+        )
-        self.assertEqual(oc_list[0].changed_object, site)
+        self.assertEqual(oc.changed_object, site)
-        self.assertEqual(oc_list[0].action, ObjectChangeActionChoices.ACTION_CREATE)
+        self.assertEqual(oc.action, ObjectChangeActionChoices.ACTION_CREATE)
-        self.assertEqual(oc_list[0].prechange_data, None)
+        self.assertEqual(oc.prechange_data, None)
-        self.assertEqual(oc_list[0].postchange_data['custom_fields']['my_field'], form_data['cf_my_field'])
+        self.assertEqual(oc.postchange_data['custom_fields']['my_field'], form_data['cf_my_field'])
-        self.assertEqual(oc_list[0].postchange_data['custom_fields']['my_field_select'], form_data['cf_my_field_select'])
+        self.assertEqual(oc.postchange_data['custom_fields']['my_field_select'], form_data['cf_my_field_select'])
-        self.assertEqual(oc_list[1].action, ObjectChangeActionChoices.ACTION_UPDATE)
+        self.assertEqual(oc.postchange_data['tags'], ['Tag 1', 'Tag 2'])
-        self.assertEqual(oc_list[1].postchange_data['tags'], ['Tag 1', 'Tag 2'])
 
     def test_update_object(self):
         site = Site(name='Site 1', slug='site-1')
@@ -93,8 +92,8 @@ class ChangeLogViewTest(ModelViewTestCase):
         response = self.client.post(**request)
         self.assertHttpStatus(response, 302)
 
+        # Verify the creation of a new ObjectChange record
         site.refresh_from_db()
-        # Get only the most recent OC
         oc = ObjectChange.objects.filter(
             changed_object_type=ContentType.objects.get_for_model(Site),
             changed_object_id=site.pk
@@ -259,17 +258,15 @@ class ChangeLogAPITest(APITestCase):
         self.assertHttpStatus(response, status.HTTP_201_CREATED)
 
         site = Site.objects.get(pk=response.data['id'])
-        # First OC is the creation; second is the tags update
+        oc = ObjectChange.objects.get(
-        oc_list = ObjectChange.objects.filter(
             changed_object_type=ContentType.objects.get_for_model(Site),
             changed_object_id=site.pk
-        ).order_by('pk')
+        )
-        self.assertEqual(oc_list[0].changed_object, site)
+        self.assertEqual(oc.changed_object, site)
-        self.assertEqual(oc_list[0].action, ObjectChangeActionChoices.ACTION_CREATE)
+        self.assertEqual(oc.action, ObjectChangeActionChoices.ACTION_CREATE)
-        self.assertEqual(oc_list[0].prechange_data, None)
+        self.assertEqual(oc.prechange_data, None)
-        self.assertEqual(oc_list[0].postchange_data['custom_fields'], data['custom_fields'])
+        self.assertEqual(oc.postchange_data['custom_fields'], data['custom_fields'])
-        self.assertEqual(oc_list[1].action, ObjectChangeActionChoices.ACTION_UPDATE)
+        self.assertEqual(oc.postchange_data['tags'], ['Tag 1', 'Tag 2'])
-        self.assertEqual(oc_list[1].postchange_data['tags'], ['Tag 1', 'Tag 2'])
 
     def test_update_object(self):
         site = Site(name='Site 1', slug='site-1')
@@ -294,11 +291,10 @@ class ChangeLogAPITest(APITestCase):
         self.assertHttpStatus(response, status.HTTP_200_OK)
 
         site = Site.objects.get(pk=response.data['id'])
-        # Get only the most recent OC
+        oc = ObjectChange.objects.get(
-        oc = ObjectChange.objects.filter(
             changed_object_type=ContentType.objects.get_for_model(Site),
             changed_object_id=site.pk
-        ).first()
+        )
         self.assertEqual(oc.changed_object, site)
         self.assertEqual(oc.action, ObjectChangeActionChoices.ACTION_UPDATE)
         self.assertEqual(oc.postchange_data['custom_fields'], data['custom_fields'])

netbox/utilities/testing/api.py

@@ -6,6 +6,8 @@ from django.test import override_settings
 from rest_framework import status
 from rest_framework.test import APIClient
 
+from extras.choices import ObjectChangeActionChoices
+from extras.models import ObjectChange
 from users.models import ObjectPermission, Token
 from .utils import disable_warnings
 from .views import ModelTestCase
@@ -223,13 +225,23 @@ class APIViewTestCases:
             response = self.client.post(self._get_list_url(), self.create_data[0], format='json', **self.header)
             self.assertHttpStatus(response, status.HTTP_201_CREATED)
             self.assertEqual(self._get_queryset().count(), initial_count + 1)
+            instance = self._get_queryset().get(pk=response.data['id'])
             self.assertInstanceEqual(
-                self._get_queryset().get(pk=response.data['id']),
+                instance,
                 self.create_data[0],
                 exclude=self.validation_excluded_fields,
                 api=True
             )
 
+            # Verify ObjectChange creation
+            if hasattr(self.model, 'to_objectchange'):
+                objectchanges = ObjectChange.objects.filter(
+                    changed_object_type=ContentType.objects.get_for_model(instance),
+                    changed_object_id=instance.pk
+                )
+                self.assertEqual(len(objectchanges), 1)
+                self.assertEqual(objectchanges[0].action, ObjectChangeActionChoices.ACTION_CREATE)
+
         def test_bulk_create_objects(self):
             """
             POST a set of objects in a single request.
@@ -304,6 +316,15 @@ class APIViewTestCases:
                 api=True
             )
 
+            # Verify ObjectChange creation
+            if hasattr(self.model, 'to_objectchange'):
+                objectchanges = ObjectChange.objects.filter(
+                    changed_object_type=ContentType.objects.get_for_model(instance),
+                    changed_object_id=instance.pk
+                )
+                self.assertEqual(len(objectchanges), 1)
+                self.assertEqual(objectchanges[0].action, ObjectChangeActionChoices.ACTION_UPDATE)
+
         def test_bulk_update_objects(self):
             """
             PATCH a set of objects in a single request.
@@ -367,6 +388,15 @@ class APIViewTestCases:
             self.assertHttpStatus(response, status.HTTP_204_NO_CONTENT)
             self.assertFalse(self._get_queryset().filter(pk=instance.pk).exists())
 
+            # Verify ObjectChange creation
+            if hasattr(self.model, 'to_objectchange'):
+                objectchanges = ObjectChange.objects.filter(
+                    changed_object_type=ContentType.objects.get_for_model(instance),
+                    changed_object_id=instance.pk
+                )
+                self.assertEqual(len(objectchanges), 1)
+                self.assertEqual(objectchanges[0].action, ObjectChangeActionChoices.ACTION_DELETE)
+
         def test_bulk_delete_objects(self):
             """
             DELETE a set of objects in a single request.

netbox/utilities/testing/views.py

@@ -10,7 +10,8 @@ from django.utils.text import slugify
 from netaddr import IPNetwork
 from taggit.managers import TaggableManager
 
-from extras.models import Tag
+from extras.choices import ObjectChangeActionChoices
+from extras.models import ObjectChange, Tag
 from users.models import ObjectPermission
 from utilities.permissions import resolve_permission_ct
 from .utils import disable_warnings, extract_form_failures, post_data
@@ -323,7 +324,16 @@ class ViewTestCases:
             }
             self.assertHttpStatus(self.client.post(**request), 302)
             self.assertEqual(initial_count + 1, self._get_queryset().count())
-            self.assertInstanceEqual(self._get_queryset().order_by('pk').last(), self.form_data)
+            instance = self._get_queryset().order_by('pk').last()
+            self.assertInstanceEqual(instance, self.form_data)
+
+            # Verify ObjectChange creation
+            objectchanges = ObjectChange.objects.filter(
+                changed_object_type=ContentType.objects.get_for_model(instance),
+                changed_object_id=instance.pk
+            )
+            self.assertEqual(len(objectchanges), 1)
+            self.assertEqual(objectchanges[0].action, ObjectChangeActionChoices.ACTION_CREATE)
 
         @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'])
         def test_create_object_with_constrained_permission(self):
@@ -410,6 +420,14 @@ class ViewTestCases:
             self.assertHttpStatus(self.client.post(**request), 302)
             self.assertInstanceEqual(self._get_queryset().get(pk=instance.pk), self.form_data)
 
+            # Verify ObjectChange creation
+            objectchanges = ObjectChange.objects.filter(
+                changed_object_type=ContentType.objects.get_for_model(instance),
+                changed_object_id=instance.pk
+            )
+            self.assertEqual(len(objectchanges), 1)
+            self.assertEqual(objectchanges[0].action, ObjectChangeActionChoices.ACTION_UPDATE)
+
         @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'])
         def test_edit_object_with_constrained_permission(self):
             instance1, instance2 = self._get_queryset().all()[:2]
@@ -489,6 +507,14 @@ class ViewTestCases:
             with self.assertRaises(ObjectDoesNotExist):
                 self._get_queryset().get(pk=instance.pk)
 
+            # Verify ObjectChange creation
+            objectchanges = ObjectChange.objects.filter(
+                changed_object_type=ContentType.objects.get_for_model(instance),
+                changed_object_id=instance.pk
+            )
+            self.assertEqual(len(objectchanges), 1)
+            self.assertEqual(objectchanges[0].action, ObjectChangeActionChoices.ACTION_DELETE)
+
         @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'])
         def test_delete_object_with_constrained_permission(self):
             instance1, instance2 = self._get_queryset().all()[:2]