Method Modeling: A Refactoring: A Refactoring

gistfile1.rb

module AwesomeResource
  attr_reader :awesome_attributes

  def initialize(attributes={})
    @awesome_attributes = attributes
    @awesome_attributes.keys.each do |method_name|
      create_method(method_name.to_sym) do
        @awesome_attributes[method_name]
      end

      create_method("#{method_name}=".to_sym) do |new_val|
        @awesome_attributes[method_name] = new_val
      end
    end
  end

  private

  def create_method(name, &block)
    self.class.send(:define_method, name, &block)
  end
end

describe 'something' 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