From 79fb0bcb7d9af7b23c498209aea0c6d15b8a8461 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Wed, 19 Jul 2017 19:57:30 +0200
Subject: [PATCH] Use next to get first record instead of index

This allows to use set with ModelStorage.save.

issue6633
review40521002
---
 trytond/model/modelstorage.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/trytond/model/modelstorage.py b/trytond/model/modelstorage.py
index 5ec262eafe..64e0454311 100644
--- a/trytond/model/modelstorage.py
+++ b/trytond/model/modelstorage.py
@@ -1457,9 +1457,10 @@ class ModelStorage(Model):
             save_values = {}
             to_create = []
             to_write = []
-            transaction = records[0]._transaction
-            user = records[0]._user
-            context = records[0]._context
+            first = next(iter(records))
+            transaction = first._transaction
+            user = first._user
+            context = first._context
             for record in records:
                 if (record._transaction != transaction
                         or user != record._user