diff --git a/kfet/management/commands/dumpstuff.py b/kfet/management/commands/dumpstuff.py
index d13810e5..cee92a58 100644
--- a/kfet/management/commands/dumpstuff.py
+++ b/kfet/management/commands/dumpstuff.py
@@ -33,19 +33,28 @@ def dump_articles(filename: str) -> None:
 
 
 def dump_operations(filename: str, accounts_hashes: Dict[int, str]) -> None:
-    not_canceled_purchases = Operation.objects.filter(type=Operation.PURCHASE).filter(
-        canceled_at__isnull=True
+    not_canceled_purchases = (
+        Operation.objects.filter(type=Operation.PURCHASE)
+        .filter(canceled_at__isnull=True)
+        .values_list(
+            "amount",
+            "article__id",
+            "article_nb",
+            "group__at",
+            "group__is_cof",
+            "group__on_acc__id",
+        )
     )
     operations = [
         {
-            "amount": str(operation.amount),
-            "article": operation.article.id,
-            "number": operation.article_nb,
-            "date": str(operation.group.at),
-            "is_cof": operation.group.is_cof,
-            "on_account": accounts_hashes[operation.group.on_acc.id],
+            "amount": str(amount),
+            "article": article_id,
+            "number": nb,
+            "date": str(at),
+            "is_cof": is_cof,
+            "on_account": accounts_hashes[on_acc],
         }
-        for operation in not_canceled_purchases
+        for amount, article_id, nb, at, is_cof, on_acc in not_canceled_purchases
     ]
     with open(filename, "w") as file:
         json.dump(operations, file, indent=4)