nested_resource.rb

module Dsl
  class Resource
    attr_accessor :name

    def initialize(name)
      @name = name
    end

    def get
      puts name
    end
  end

  def resources(name, &blk)
    if @current_resource
      @previous_resource = @current_resource
    end

    @current_resource = Resource.new(name)

    instance_eval(&blk) if block_given?

    if @previous_resource
      @current_resource = @previous_resource
    end
  end

  def method_missing(name, *args, &blk)
    if @current_resource
      @current_resource.send(name, *args, &blk)
    else
      super
    end
  end
end

class Post
  extend Dsl

  resources :users do
    get

    resources :blogs do
      get
    end

    resources :posts do
      get

      resources :comments do
        get
      end
    end

    get
  end
end