vendor/rails/activeresource/test/setter_trap.rb

   1 class SetterTrap < ActiveSupport::BasicObject
   2   class << self
   3     def rollback_sets(obj)
   4       trapped = new(obj)
   5       yield(trapped).tap { trapped.rollback_sets }
   6     end
   7   end
   8
   9   def initialize(obj)
  10     @cache = {}
  11     @obj = obj
  12   end
  13
  14   def respond_to?(method)
  15     @obj.respond_to?(method)
  16   end
  17
  18   def method_missing(method, *args, &proc)
  19     @cache[method] ||= @obj.send($`) if method.to_s =~ /=$/
  20     @obj.send method, *args, &proc
  21   end
  22
  23   def rollback_sets
  24     @cache.each { |k, v| @obj.send k, v }
  25   end
  26 end