XgStruct

xg_struct.rb

class XgStruct
  def initialize(attributes)
    @attributes = process(attributes)
  end

  def method_missing(name, *args, &block)
    if (name =~ /^(\w+)=$/) == 0
      @attributes[$1.to_sym] = args[0]
    else
      @attributes[name] || super
    end
  end

  private

  def process(attributes)
    attributes.each do |key, value|
      attributes[key] = self.class.new(value) if value.is_a?(Hash)
    end
  end
end

xg_struct_spec.rb

require 'spec_helper'

describe XgStruct do
  subject { XgStruct.new(foo: :bar, one: { two: :three }) }

  describe '#foo' do
    it 'returns bar' do
      expect(subject.foo).to eq(:bar)
    end
  end

  describe '#foo=' do
    before { subject.foo = :baz }

    it 'returns baz' do
      expect(subject.foo).to eq(:baz)
    end
  end

  describe '#one#two' do
    subject { XgStruct.new(one: { two: :three }) }

    it 'returns three' do
      expect(subject.one.two).to eq(:three)
    end
  end

  describe '#one#two#three' do
    subject { XgStruct.new(one: { two: {three: :four}}) }

    it 'returns four' do
      expect(subject.one.two.three).to eq(:four)
    end
  end
end