From 1b62dd5c405cb47f8dcbaa724ce2d9f9cc73e180 Mon Sep 17 00:00:00 2001
From: Ross Lawley <ross.lawley@gmail.com>
Date: Tue, 14 Jan 2014 10:01:39 +0000
Subject: [PATCH] Fix duplicate error check

---
 mongoengine/document.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mongoengine/document.py b/mongoengine/document.py
index 59bea359..b47490bd 100644
--- a/mongoengine/document.py
+++ b/mongoengine/document.py
@@ -280,7 +280,9 @@ class Document(BaseDocument):
                     kwargs.update(cascade_kwargs)
                 kwargs['_refs'] = _refs
                 self.cascade_save(**kwargs)
-
+        except pymongo.errors.DuplicateKeyError, err:
+            message = u'Tried to save duplicate unique keys (%s)'
+            raise NotUniqueError(message % unicode(err))
         except pymongo.errors.OperationFailure, err:
             message = 'Could not save document (%s)'
             if re.match('^E1100[01] duplicate key', unicode(err)):