Metaprogramming instance methods

new_client.rb

module Rubyoverflow
  class Client
    Rubyoverflow.constants.select {|c| Class === Rubyoverflow.const_get(c) and Rubyoverflow.const_get(c) < Rubyoverflow::Base}.each do |class_sym|
      send :attr_reader, class_sym.downcase
      send "define_method", class_sym.downcase do 
        instance_variable_set("@#{class_sym.downcase}", Rubyoverflow.const_get(class_sym).new(self)) unless instance_variable_get("@#{class_sym.downcase}")
        instance_variable_get "@#{class_sym.downcase}"
      end
    end
  end
end

old_client.rb

module Rubyoverflow
  class Client
    @users = nil
    def users
      @user ||= Users.new(self)
    end
    #Repeated for all the other routes
  end
end

User.rb

module Rubyoverflow
  class Users < Rubyoverflow::Base
    #...
  end
end