DummyQuerySet should be iterable to allow for serialization

netbox/extras/middleware.py

@@ -46,7 +46,7 @@ def handle_deleted_object(sender, instance, **kwargs):
 
     # Preserve tags
     if is_taggable(instance):
-        copy.tags = list(instance.tags.all())
+        copy.tags = DummyQuerySet(instance.tags.all())
 
     # Queue the copy of the object for processing once the request completes
     _thread_locals.changed_objects.append(

netbox/utilities/querysets.py

@@ -10,6 +10,9 @@ class DummyQuerySet:
     def __init__(self, queryset):
         self._cache = [obj for obj in queryset.all()]
 
+    def __iter__(self):
+        return iter(self._cache)
+
     def all(self):
         return self._cache