From 782a22ec6f7820c2246a2951ceaeaab5ebcb4beb Mon Sep 17 00:00:00 2001
From: "David M. Carr" <dcarr@carrclan.us>
Date: Fri, 24 Aug 2012 23:17:14 -0300
Subject: [PATCH] Update source/applications/aggregation.txt

Update the $group usage in the example to use the updated syntax,
as per the group posting below.

https://groups.google.com/d/topic/mongodb-user/1cYch580h0w/discussion
---
 source/applications/aggregation.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/applications/aggregation.txt b/source/applications/aggregation.txt
index cc8320d47ab..04cff713ae1 100644
--- a/source/applications/aggregation.txt
+++ b/source/applications/aggregation.txt
@@ -143,7 +143,7 @@ command:
      } },
      { $unwind : “$tags” },
      { $group : {
-        _id : { tags : 1 },
+        _id : { tags : "$tags" },
         authors : { $addToSet : “$author” }
      } }
    );