Add patch of product module issue 4816

issue12191002_1.diff

@@ -0,0 +1,75 @@
+# HG changeset patch
+# User Cédric Krier <cedric.krier@b2ck.com>
+Fix rounding issue in Uom.round
+
+
+issue4816
+review12191002
+
+Index: trytond/trytond/modules/product/tests/test_product.py
+===================================================================
+
+--- a/trytond/trytond/modules/product/tests/test_product.py
++++ b/trytond/trytond/modules/product/tests/test_product.py
+@@ -6,6 +6,7 @@
+ from trytond.tests.test_tryton import ModuleTestCase
+ from trytond.tests.test_tryton import POOL, DB_NAME, USER, CONTEXT
+ from trytond.transaction import Transaction
++from trytond.pool import Pool
+ 
+ 
+ class ProductTestCase(ModuleTestCase):
+@@ -253,6 +254,26 @@
+                     ('template.category', '=', category2.id),
+                     ], count=True), 2)
+ 
++    def test_uom_round(self):
++        'Test uom round function'
++        tests = [
++            (2.53, .1, 2.5),
++            (3.8, .1, 3.8),
++            (3.7, .1, 3.7),
++            (1.3, .5, 1.5),
++            (1.1, .3, 1.2),
++            (17, 10, 20),
++            (7, 10, 10),
++            (4, 10, 0),
++            (17, 15, 15),
++            (2.5, 1.4, 2.8),
++            ]
++        with Transaction().start(DB_NAME, USER, context=CONTEXT):
++            pool = Pool()
++            Uom = pool.get('product.uom')
++            for number, precision, result in tests:
++                self.assertEqual(Uom.round(number, precision), result)
++
+ 
+ def suite():
+     suite = trytond.tests.test_tryton.suite()
+
+Index: trytond/trytond/modules/product/uom.py
+===================================================================
+
+--- a/trytond/trytond/modules/product/uom.py
++++ b/trytond/trytond/modules/product/uom.py
+@@ -1,5 +1,6 @@
+ #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 __future__ import division
+ from decimal import Decimal
+ from sql import Table
+ 
+@@ -134,7 +135,11 @@
+ 
+     @staticmethod
+     def round(number, precision=1.0):
+-        return round(number / precision) * precision
++        i, d = divmod(precision, 1)
++        base = round(number / precision)
++        # Instead of multiply by the decimal part, we must divide by the
++        # integer to avoid precision lost due to float
++        return (base * i) + ((base / (1 / d)) if d != 0 else 0)
+ 
+     @classmethod
+     def validate(cls, uoms):
+

series

@@ -54,3 +54,4 @@ issue9801002_40001.diff
 issue19281002_1.diff
 issue13181002_1.diff
 issue16351002_1.diff
+issue12191002_1.diff