nstruct.rb

require 'ostruct'
class NestedStruct < OpenStruct

  def method_missing(name, *)
    super(:"#{name}=", NestedStruct.new)  unless name.to_s =~ /=$/
    super
  end

  def marshal_dump
    dump = super
    dump.keys.each do |key|
      dump[key] = dump[key].marshal_dump  if dump[key].is_a?(self.class)
    end
    dump
  end

end