nested routes

app.rb

Cuba.define do
  on "posts" do
    run Posts
  end
end

class Posts < Cuba
  define do
    on ":id" do |id|
      post = Post[id]
      # some methods
      on "comments" do
        run Comments
      end
    end
  end
end

class Comments < Cuba
  define do
    # some routes
  end
end