From 63c42a2e6feee93375482d9126e84d4e0c5c9ae0 Mon Sep 17 00:00:00 2001
From: Robin Baumgartner <robin@baumgartners.ch>
Date: Mon, 24 Nov 2014 14:02:22 +0100
Subject: [PATCH] Use Null constant from python-sql for comparisons

issue4143
review13701003
---
 setup.py | 2 +-
 work.py  | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/setup.py b/setup.py
index edabcc091e..78954d7326 100644
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,7 @@ if minor_version % 2:
         'hg+http://hg.tryton.org/modules/%s#egg=%s-%s' % (
             name[8:], name, version))
 
-requires = []
+requires = ['python-sql >= 0.4']
 for dep in info.get('depends', []):
     if not re.match(r'(ir|res|webdav)(\W|$)', dep):
         requires.append(get_require_version('trytond_%s' % dep))
diff --git a/work.py b/work.py
index 513cdd0343..80842174b1 100644
--- a/work.py
+++ b/work.py
@@ -1,5 +1,7 @@
 #This file is part of Tryton.  The COPYRIGHT file at the top level of
 #this repository contains the full copyright notices and license terms.
+from sql import Null
+
 from trytond.model import ModelView, ModelSQL, fields
 from trytond.pyson import Eval
 from trytond import backend
@@ -58,7 +60,7 @@ class Work(ModelSQL, ModelView):
     @staticmethod
     def order_sequence(tables):
         table, _ = tables[None]
-        return [table.sequence == None, table.sequence]
+        return [table.sequence == Null, table.sequence]
 
     @staticmethod
     def default_type():