Add a monkey patch for PersistentMapping so that calling Foo.copy() will not...

Add a monkey patch for PersistentMapping so that calling Foo.copy() will not cause 'Foo' to be marked as modified and saved again to ZODB (there is persistence-unfriendly code in python's UserDict "copy" method).


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15332 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/ZopePatch.py

@@ -51,6 +51,7 @@ from Products.ERP5Type.patches import HTTPRequest
 from Products.ERP5Type.patches import Connection
 from Products.ERP5Type.patches import copy_reg_patch
 from Products.ERP5Type.patches import PersistencePatch
+from Products.ERP5Type.patches import PersistentMapping
 
 # for python2.3 compatibility
 import threading

product/ERP5Type/patches/PersistentMapping.py

+##############################################################################
+#
+# Copyright (c) 2007 Nexedi SARL and Contributors. All Rights Reserved.
+#                    Vincent Pelletier <vincent@nexedi.com>
+#
+# WARNING: This program as such is intended to be used by professional
+# programmers who take the whole responsability of assessing all potential
+# consequences resulting from its eventual inadequacies and bugs
+# End users who are looking for a ready-to-use solution with commercial
+# garantees and support are strongly adviced to contract a Free Software
+# Service Company
+#
+# This program is Free Software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+#
+##############################################################################
+
+from Globals import PersistentMapping
+
+PersistentMapping__super_copy = PersistentMapping.copy
+def PersistentMapping_copy(self):
+  if isinstance(self, PersistentMapping):
+    return PersistentMapping(self.data.copy())
+  return PersistentMapping__super_copy(self)
+PersistentMapping.copy = PersistentMapping_copy
+