1 files changed, 22 insertions, 9 deletions
diff --git a/activesupport/lib/active_support/ordered_hash.rb b/activesupport/lib/active_support/ordered_hash.rb
index 3def0be639..25ea505813 100644
--- a/activesupport/lib/active_support/ordered_hash.rb
+++ b/activesupport/lib/active_support/ordered_hash.rb
@@ -10,10 +10,14 @@ module ActiveSupport
         @keys = []
       end
 
+      def initialize_copy(other)
+        super
+        # make a deep copy of keys
+        @keys = other.keys
+      end
+
       def []=(key, value)
-        if !has_key?(key)
-          @keys << key
-        end
+        @keys << key if !has_key?(key)
         super
       end
 
@@ -24,6 +28,12 @@ module ActiveSupport
         end
         super
       end
+      
+      def delete_if
+        super
+        sync_keys!
+        self
+      end
 
       def reject!
         super
@@ -36,7 +46,7 @@ module ActiveSupport
       end
 
       def keys
-        @keys
+        @keys.dup
       end
 
       def values
@@ -56,7 +66,7 @@ module ActiveSupport
       end
 
       def each
-        keys.each {|key| yield [key, self[key]]}
+        @keys.each {|key| yield [key, self[key]]}
       end
 
       alias_method :each_pair, :each
@@ -73,13 +83,16 @@ module ActiveSupport
         [k, v]
       end
 
+      def merge!(other_hash)
+        other_hash.each {|k,v| self[k] = v }
+        self
+      end
+
       def merge(other_hash)
-        result = dup
-        other_hash.each {|k,v| result[k]=v}
-        result
+        dup.merge!(other_hash)
       end
 
-      private
+    private
 
       def sync_keys!
         @keys.delete_if {|k| !has_key?(k)}