From 28796ac7deb9ffb303cb6792b3bbd20138742d9b Mon Sep 17 00:00:00 2001
From: John Ewart <john@unixninjas.org>
Date: Wed, 14 Dec 2011 17:49:08 -0800
Subject: [PATCH 1/2] Support :db key for :out in map_reduce

References RUBY-389
---
 lib/mongo/collection.rb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/mongo/collection.rb b/lib/mongo/collection.rb
index b5b98a5..7cd0b36 100644
--- a/lib/mongo/collection.rb
+++ b/lib/mongo/collection.rb
@@ -624,7 +624,12 @@ module Mongo
       if raw
         result
       elsif result["result"]
-        @db[result["result"]]
+        if result['result'].is_a? BSON::OrderedHash and result['result'].has_key? 'db' and result['result'].has_key? 'collection'
+          otherdb = @db.connection[result['result']['db']]
+          otherdb[result['result']['collection']]
+        else
+          @db[result["result"]]
+        end
       else
         raise ArgumentError, "Could not instantiate collection from result. If you specified " +
           "{:out => {:inline => true}}, then you must also specify :raw => true to get the results."

From 6c0b3723e9bec25dd32b65ae6c69b6f5611b1f47 Mon Sep 17 00:00:00 2001
From: John Ewart <john@unixninjas.org>
Date: Thu, 15 Dec 2011 08:06:01 -0800
Subject: [PATCH 2/2] =?UTF-8?q?Adding=20test=20for=20the=20:out=20=3D>=20{?=
 =?UTF-8?q?:db=20=E2=80=A6}=20key?=
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

Forgot to add the test in the last commit.
---
 test/collection_test.rb | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/test/collection_test.rb b/test/collection_test.rb
index df61389..d3f46a9 100644
--- a/test/collection_test.rb
+++ b/test/collection_test.rb
@@ -546,6 +546,19 @@ class TestCollection < Test::Unit::TestCase
         @@test.map_reduce(m, r, :raw => true, :out => {:inline => 1})
         assert res["results"]
       end
+      
+      def test_map_reduce_with_collection_output_to_other_db
+        @@test << {:user_id => 1}
+        @@test << {:user_id => 2}
+        
+        m = Code.new("function() { emit(this.user_id, 1); }")
+        r = Code.new("function(k,vals) { return 1; }")
+        res = @@test.map_reduce(m, r, :out => {:replace => 'foo', :db => 'somedb'})
+        assert res["result"]
+        assert res["counts"]
+        assert res["timeMillis"]
+        assert res.find.to_a.any? {|doc| doc["_id"] == 2 && doc["value"] == 1}
+      end
     end
   end