From bee01765293762819f45b6054d4bbb3c5bc83bea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Tue, 4 Dec 2012 16:48:25 +0100
Subject: [PATCH] Invoice.copy is a class method now

---
 invoice.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/invoice.py b/invoice.py
index 30d7886233..901b67e829 100644
--- a/invoice.py
+++ b/invoice.py
@@ -48,12 +48,13 @@ class Invoice:
                 states[invoice.id] = 'ignored'
         return states
 
-    def copy(self, ids, default=None):
+    @classmethod
+    def copy(cls, invoices, default=None):
         if default is None:
             default = {}
         default = default.copy()
         default.setdefault('sales', None)
-        return super(Invoice, self).copy(ids, default=default)
+        return super(Invoice, cls).copy(invoices, default=default)
 
     @classmethod
     def delete(cls, invoices):