app.rb

require_relative "./users"
require_relative "./posts"

Cuba.use JSONAllTheThings

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

posts.rb

class Posts < Cuba
  define do
    # HERE BY DRAGONS
  end
end

users.rb

class Users < Cuba
  define do
    # MAGIC
  end
end