How do I use hash keys as methods on a class?

Question

I have a class and a hash. How can I get the members of the hash to dynamically become methods on the class with the key as the method name?

class User
  def initialize
    @attributes = {"sn" => "Doe", "givenName" => "John"}
  end
end

For example, I would like to be able to have the following output Doe:

u = User.new
puts u.sn

Answer 1

Just use OpenStruct:

require 'ostruct'
class User < OpenStruct
end

u = User.new :sn => 222
u.sn