From c4dddc490a20bfd6c15e32e55e38985b63c7f1ae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Wed, 10 Aug 2016 23:00:16 +0200
Subject: [PATCH] Change Invoice.set_number into classmethod

issue5751
review30381002
---
 invoice.py | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/invoice.py b/invoice.py
index 0f5f8479cc..3e8a7cf5ec 100644
--- a/invoice.py
+++ b/invoice.py
@@ -26,11 +26,12 @@ class Invoice:
         if 'open_date' not in cls.payment_term.depends:
             cls.payment_term.depends.append('open_date')
 
-    def set_number(self):
-        set_open_date = not self.number
-        super(Invoice, self).set_number()
+    @classmethod
+    def set_number(cls, invoices):
+        set_open_date = [i for i in invoices if not i.number]
+        super(Invoice, cls).set_number(invoices)
         if set_open_date:
-            self.write([self], {
+            cls.write(set_open_date, {
                     'open_date': datetime.datetime.now(),
                     })