From f8904a5504c74eb20b9b54f55eae8db569ae3e34 Mon Sep 17 00:00:00 2001
From: Ross Lawley <ross.lawley@gmail.com>
Date: Wed, 5 Jun 2013 12:14:22 +0000
Subject: [PATCH] Explicitly set w:1 if None in save

---
 mongoengine/document.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mongoengine/document.py b/mongoengine/document.py
index 5edfc810..563f57a4 100644
--- a/mongoengine/document.py
+++ b/mongoengine/document.py
@@ -202,7 +202,7 @@ class Document(BaseDocument):
             self.validate(clean=clean)
 
         if not write_concern:
-            write_concern = {}
+            write_concern = {"w": 1}
 
         doc = self.to_mongo()