embedding.rb

module Embedding
  def embeds_many(association_id, options = {})
    has_many association_id, options.merge(:dependent => :destroy)
    accepts_nested_attributes_for association_id, :allow_destroy => true
  end
  
  def embeds_one(association_id, options = {})
    has_one association_id, options.merge(:dependent => :destroy)
    accepts_nested_attributes_for association_id, :allow_destroy => true
  end
end

ActiveRecord::Base.extend Embedding