module CouchPotato module Persistence module DirtyAttributes def self.included(base) #:nodoc: base.class_eval do after_save :reset_dirty_attributes def initialize(attributes = {}) super assign_attribute_copies_for_dirty_tracking end end end # returns true if a model has dirty attributes, i.e. their value has changed since the last save def dirty? new? || self.class.properties.inject(false) do |res, property| res || property.dirty?(self) end end private def assign_attribute_copies_for_dirty_tracking attributes.each do |name, value| self.instance_variable_set("@#{name}_was", clone_attribute(value)) end if attributes end def reset_dirty_attributes self.class.properties.each do |property| instance_variable_set("@#{property.name}_was", clone_attribute(send(property.name))) end end def clone_attribute(value) if [Fixnum, Symbol, TrueClass, FalseClass, NilClass, Float].include?(value.class) value elsif [Hash, Array].include?(value.class) #Deep clone Marshal::load(Marshal::dump(value)) else value.clone end end end end end