update prefetched fields

core/inventory/models.py

@@ -32,7 +32,11 @@ class Item(SoftDeleteModel):
     @property
     def container(self):
         try:
-            return self.container_history.order_by('-timestamp').first().container
+            history = sorted(self.container_history.all(), key=lambda x: x.timestamp, reverse=True)
+            if history:
+                return history[0].container
+            else:
+                return None
         except AttributeError:
             return None