From 2cda3c591e99be21005fc80158b0734bcd450a14 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Thu, 4 Dec 2008 18:25:58 +0100
Subject: [PATCH] Improve Cache when function return None or False

---
 trytond/tools/misc.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/trytond/tools/misc.py b/trytond/tools/misc.py
index 56da2906f2..2a3a80e0db 100644
--- a/trytond/tools/misc.py
+++ b/trytond/tools/misc.py
@@ -251,6 +251,7 @@ class Cache(object):
 
         def cached_result(self2, cursor=None, *args, **kwargs):
             result = None
+            find = False
             if isinstance(cursor, basestring):
                 Cache.reset(cursor, self.name)
                 self.lock.acquire()
@@ -298,10 +299,11 @@ class Cache(object):
                     mintime = time.time() - self.timeout
                     if self.timeout <= 0 or mintime <= last_time:
                         result = value
+                        find = True
             finally:
                 self.lock.release()
 
-            if not result:
+            if not find:
                 # Work out new value, cache it and return it
                 # Should copy() this value to avoid futur modf of the cacle ?
                 result = function(self2, cursor, **dict(kwargs))