serialized_attributes.rb

# Untested, mind dump

class Document < ActiveRecord::Base
  include Virtus

  before_save :dump_attributes
  after_initialize :load_attributes

  private

  def dump_attributes
    attributes_store = {}
    self.attributes.collect { | attribute, meta | attributes_store[attribute] = self.send(attribute) }
    write_attribute(:attributes_store, Marshall.dump(attributes_store))
  end

  def load_attributes
    Marshall.load(read_attribute(attributes_store)).each do | attribute, value |
      self.send(attribute) = value
    end
  end
end


 class Event < Document
  attribute :starts_at_date,  Date
  attribute :capacity, Integer
end