From f730500c3d606daf6a9ba9a0cf166a454353752b Mon Sep 17 00:00:00 2001
From: Charles Haley <cbhaley@i.wont.say.com>
Date: Sun, 15 Sep 2013 09:09:02 +0200
Subject: [PATCH] Have metadata.book.set_all_user_metadata actually set the
 metadata, not merge it.

---
 src/calibre/ebooks/metadata/book/base.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/ebooks/metadata/book/base.py b/src/calibre/ebooks/metadata/book/base.py
index bacf10dc73..0f87edda0c 100644
--- a/src/calibre/ebooks/metadata/book/base.py
+++ b/src/calibre/ebooks/metadata/book/base.py
@@ -391,7 +391,7 @@ class Metadata(object):
                     m['#value#'] = None
             um[key] = m
         _data = object.__getattribute__(self, '_data')
-        _data['user_metadata'].update(um)
+        _data['user_metadata'] = um
 
     def set_user_metadata(self, field, metadata):
         '''