module EasySelectFields
  def easy_select_fields(a,options)
    type_method_name = "#{a}_types".to_sym
    array = options.each_with_index.map {|o,i| [o, i += 1] }

    class_eval "def self.#{a}_types() #{array.inspect} end"
  end
end

class Person
  extend EasySelectFields
  easy_select_fields "status", ["Interested", "Not Interested", "Available"]
end