Get Marshal.dump and Marshal.load to load cached association objects ( Whatever.includes(:example_models) ), as well.

active_record_marshalable.rb

module ActiveRecordMarshalable
  def marshal_dump
    [attributes, self.association_cache, instance_variable_get(:@new_record)]
  end

  def marshal_load data
    send :initialize, data[0]
    instance_variable_set :@association_cache, data[1]
    instance_variable_set :@new_record, data[2]
  end
end

example_model.rb

class ExampleModel < ActiveRecord::Base
  include ActiveRecordMarshalable
end