memo on DestroyAllSoftware screencasts - override Struct initialize - alias_method :allow_export?, :allow_export

gistfile1.rb

class Subscription < Struct.new(:id, :type)
  attr_reader :allow_export
  alias_method :allow_export?, :allow_export

  def initialize(id, type)
    super
    @allow_export = id.present? && type == 'business'
  end
end

gistfile2.rb

class Subscription < Struct.new(:id, :type)
  def active?
    id.present?
  end
  
  def allow_export?
    active? && type == 'business'
  end
end