From 89d5f0510f79a206ea285d9a36a7d04de104e532 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Sat, 1 Sep 2018 01:02:03 +0200
Subject: [PATCH] Improve ModelStorage.copy

* Allow callable in copy default
* Support dotted notation in copy default
* Use setdefault in copy
* Copy default when needed
* Do not set default state in copy
* Use callable and dotted notation in copy default

issue5576
issue7648
review72291002
---
 invoice.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/invoice.py b/invoice.py
index 2168c52fe4..ae0fbd3d3a 100644
--- a/invoice.py
+++ b/invoice.py
@@ -47,6 +47,7 @@ class Invoice(metaclass=PoolMeta):
     def copy(cls, invoices, default=None):
         if default is None:
             default = {}
-        default = default.copy()
-        default['open_date'] = None
+        else:
+            default = default.copy()
+        default.setdefault('open_date', None)
         return super(Invoice, cls).copy(invoices, default=default)