Getting_attr_accessors.rb

class VeryBase
  def self.attr_accessor(*vars)
    @attributes ||= []
    @attributes.concat vars
    super(*vars)
  end

  def self.attributes
    @attributes || []
  end

  def attributes
    self.class.attributes_with_parents
  end

  def self.attributes_with_parents(obj=self)
    return self.attributes if @touched
    attributes = self.attributes
    if obj.superclass
      if obj.superclass.respond_to? :attributes
        attributes << obj.superclass.attributes_with_parents
      end
    end
    @touched = true
    attributes.flatten
  end
end

class Base < VeryBase
  attr_accessor :name
end

class Test < Base
  attr_accessor :size
end

class Test2 < Test
  attr_accessor :size2
end

class Test3 < Test
  attr_accessor :size3
end

my_obj = Test2.new
puts "have object #{my_obj}"
my_obj_parents = my_obj.attributes_with_parents
puts "have attributes #{my_obj_parents.inspect}"