Json Response without escaping in Rails 3

json_escape.rb

module ActiveSupport
  module JSON
    module Encoding
      def self.escape(string)
        if string.respond_to?(:force_encoding)
          string = string.encode(::Encoding::UTF_8, :undef => :replace).force_encoding(::Encoding::BINARY)
        end
        json = string.gsub(escape_regex) { |s| ESCAPED_CHARS[s] }
        json = %("#{json}")
        json.force_encoding(::Encoding::UTF_8) if json.respond_to?(:force_encoding)
        json
      end
    end
  end
end