Can i extend a Ruby class to behave like OpenStruct dynamically?

Question

I have a Ruby class which includes a module. I want the including class to behave like OpenStruct. How do i achieve this without explicitly inheriting from OpenStruct?

class Book
  include MyModule
end

module MyModule
  def self.included(klass)
    # Make including class behave like OpenStruct
  end
end

instead of

class Book < OpenStruct
  include MyModule
end

Answer 1

You could delegate all methods your class does not handle to an OpenStruct:

require 'ostruct'

class Test_OS

  def initialize
    @source = OpenStruct.new
  end

  def method_missing(method, *args, &block)
    @source.send(method, *args, &block)
  end

  def own_method
    puts "Hi."
  end

end

t = Test_OS.new
t.foo = 1
p t.foo #=> 1
t.own_method #=> Hi.