class Bulb < ActiveRecord::Base default_scope where(:name => 'defaulty') belongs_to :car attr_protected :car_id, :frickinawesome attr_reader :scope_after_initialize, :attributes_after_initialize after_initialize :record_scope_after_initialize def record_scope_after_initialize @scope_after_initialize = self.class.scoped end after_initialize :record_attributes_after_initialize def record_attributes_after_initialize @attributes_after_initialize = attributes.dup end def color=(color) self[:color] = color.upcase + "!" end def self.new(attributes = {}, options = {}, &block) bulb_type = (attributes || {}).delete(:bulb_type) if options && options[:as] == :admin && bulb_type.present? bulb_class = "#{bulb_type.to_s.camelize}Bulb".constantize bulb_class.new(attributes, options, &block) else super end end end class CustomBulb < Bulb end