From 449cf50d858c9a1f7cc9fcae3ad02841da0440be Mon Sep 17 00:00:00 2001
From: chaitanyav <me@chaitanyavellanki.com>
Date: Sat, 26 Jun 2010 01:52:20 -0700
Subject: [PATCH] Add OrderedHash#invert to preserve order in ruby 1.8
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Signed-off-by: José Valim <jose.valim@gmail.com>
---
 activesupport/lib/active_support/ordered_hash.rb | 4 ++++
 activesupport/test/ordered_hash_test.rb          | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/activesupport/lib/active_support/ordered_hash.rb b/activesupport/lib/active_support/ordered_hash.rb
index ee34e2e7c3..544541205d 100644
--- a/activesupport/lib/active_support/ordered_hash.rb
+++ b/activesupport/lib/active_support/ordered_hash.rb
@@ -147,6 +147,10 @@ def replace(other)
         self
       end
 
+      def invert
+        OrderedHash[self.to_a.map!{|key_value_pair| key_value_pair.reverse}]
+      end
+
       def inspect
         "#<OrderedHash #{super}>"
       end
diff --git a/activesupport/test/ordered_hash_test.rb b/activesupport/test/ordered_hash_test.rb
index eaa59605be..47c863e903 100644
--- a/activesupport/test/ordered_hash_test.rb
+++ b/activesupport/test/ordered_hash_test.rb
@@ -228,4 +228,10 @@ def test_update_sets_keys
     @updated_ordered_hash.update(:name => "Bob")
     assert_equal [:name],  @updated_ordered_hash.keys
   end
+
+  def test_invert
+    @ordered_hash = ActiveSupport::OrderedHash[[["foo", "FOO"], ["bar", "BAR"]]]
+    @inverted_ordered_hash = @ordered_hash.invert
+    assert_equal [["FOO", "foo"], ["BAR", "bar"]], @inverted_ordered_hash.to_a
+  end
 end
-- 
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