1 files changed, 39 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/conversions.rb b/activesupport/lib/active_support/core_ext/hash/conversions.rb
new file mode 100644
index 0000000000..3218f6302c
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/hash/conversions.rb
@@ -0,0 +1,39 @@
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Hash #:nodoc:
+      module Conversions
+        XML_TYPE_NAMES = {
+          "String" => "string",
+          "Fixnum" => "integer",
+          "Date"   => "date",
+          "Time"   => "datetime"
+        }
+        
+        XML_FORMATTING = {
+          "date"     => Proc.new { |date| date.to_s(:db) },
+          "datetime" => Proc.new { |time| time.to_s(:db) }
+        }
+        
+        def to_xml(options = {})
+          options.reverse_merge!({ :builder => Builder::XmlMarkup.new, :root => "hash" })
+
+          options[:builder].__send__(options[:root]) do
+            for key in keys
+              value = self[key]
+
+              if value.is_a?(self.class)
+                value.to_xml(:builder => options[:builder], :root => key)
+              else
+                type_name = XML_TYPE_NAMES[value.class.to_s]
+                options[:builder].__send__(key.to_s.dasherize, 
+                  XML_FORMATTING[type_name] ? XML_FORMATTING[type_name].call(value) : value,
+                  value.nil? ? { } : { :type => type_name }
+                )
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+end