Closes #16388: Move change logging resources from extras to core (#16545)

* Initial work on #16388

* Misc cleanup

netbox/core/views.py

@@ -29,6 +29,7 @@ from netbox.config import get_config, PARAMS
 from netbox.views import generic
 from netbox.views.generic.base import BaseObjectView
 from netbox.views.generic.mixins import TableMixin
+from utilities.data import shallow_compare_dict
 from utilities.forms import ConfirmationForm
 from utilities.htmx import htmx_partial
 from utilities.query import count_related
@@ -176,6 +177,75 @@ class JobBulkDeleteView(generic.BulkDeleteView):
     table = tables.JobTable
 
 
+#
+# Change logging
+#
+
+class ObjectChangeListView(generic.ObjectListView):
+    queryset = ObjectChange.objects.valid_models()
+    filterset = filtersets.ObjectChangeFilterSet
+    filterset_form = forms.ObjectChangeFilterForm
+    table = tables.ObjectChangeTable
+    template_name = 'core/objectchange_list.html'
+    actions = {
+        'export': {'view'},
+    }
+
+
+@register_model_view(ObjectChange)
+class ObjectChangeView(generic.ObjectView):
+    queryset = ObjectChange.objects.valid_models()
+
+    def get_extra_context(self, request, instance):
+        related_changes = ObjectChange.objects.valid_models().restrict(request.user, 'view').filter(
+            request_id=instance.request_id
+        ).exclude(
+            pk=instance.pk
+        )
+        related_changes_table = tables.ObjectChangeTable(
+            data=related_changes[:50],
+            orderable=False
+        )
+
+        objectchanges = ObjectChange.objects.valid_models().restrict(request.user, 'view').filter(
+            changed_object_type=instance.changed_object_type,
+            changed_object_id=instance.changed_object_id,
+        )
+
+        next_change = objectchanges.filter(time__gt=instance.time).order_by('time').first()
+        prev_change = objectchanges.filter(time__lt=instance.time).order_by('-time').first()
+
+        if not instance.prechange_data and instance.action in ['update', 'delete'] and prev_change:
+            non_atomic_change = True
+            prechange_data = prev_change.postchange_data_clean
+        else:
+            non_atomic_change = False
+            prechange_data = instance.prechange_data_clean
+
+        if prechange_data and instance.postchange_data:
+            diff_added = shallow_compare_dict(
+                prechange_data or dict(),
+                instance.postchange_data_clean or dict(),
+                exclude=['last_updated'],
+            )
+            diff_removed = {
+                x: prechange_data.get(x) for x in diff_added
+            } if prechange_data else {}
+        else:
+            diff_added = None
+            diff_removed = None
+
+        return {
+            'diff_added': diff_added,
+            'diff_removed': diff_removed,
+            'next_change': next_change,
+            'prev_change': prev_change,
+            'related_changes_table': related_changes_table,
+            'related_changes_count': related_changes.count(),
+            'non_atomic_change': non_atomic_change
+        }
+
+
 #
 # Config Revisions
 #