From 5c834f2e1db3235df919b7666647fbe0c73bb85b 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
---
 purchase.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/purchase.py b/purchase.py
index 3e918c90cb..8d820e43be 100644
--- a/purchase.py
+++ b/purchase.py
@@ -67,8 +67,9 @@ class Purchase(metaclass=PoolMeta):
     def copy(cls, purchases, default=None):
         if default is None:
             default = {}
-        default = default.copy()
-        default['invoice_lines_ignored'] = None
+        else:
+            default = default.copy()
+        default.setdefault('invoice_lines_ignored', None)
         return super(Purchase, cls).copy(purchases, default=default)