Responding to http://pivotallabs.com/method-modeling-a-refactoring/

awesome_resource_spec.rb

module AwesomeResource
  attr_reader :awesome_attributes

  def initialize(attributes={})    
    @awesome_attributes = Struct.new(*attributes.keys.map(&:to_sym)).new *attributes.values
  end

  def method_missing(method_name, *args)
    if args.any?
      awesome_attributes.send(method_name, args.first)
    else
      awesome_attributes.send(method_name)
    end
  end

end

describe AwesomeResource do
  it "creates readers and writers for any attributes passed in during initialization" do
    article_class = Class.new do
      include AwesomeResource
    end
 
    article = article_class.new("title" => "Fun")
    article.title.should == "Fun"
 
    article.title = 'Fun Times!'
    article.title.should == 'Fun Times!'
 
    expect { article.unknown_attribute }.to raise_exception
  end
end