Auto-versioning for ActiveFedora::File

autoversion.rb

module ActiveFedora
  module Autoversion
    def self.included(base)
      base.class_eval do
        after_save :create_version
      end
    end
  end
end

class AutoversionedFile < ActiveFedora::File
  include ActiveFedora::Autoversion
end

class Book < ActiveFedora::Base
  contains "content", class_name: "AutoversionedFile"
end