Rails Ruby on Rails

In Rails 3, if you have both an :if block and an :on declaration on the same validation, the :if block runs before the :on declaration is checked. For example, in the following code:
validates_presence_of :blah, :on => :update, :if => lambda { |record| record.id == 4 } the :if block is run even if the context is a create.
This seems to be due to the following code in activemodel/validations/callbacks.rb:
`def before_validation(*args, &block) options = args.extract_options! if options.is_a?(Hash) && options[:on]

 options[:if] = Array.wrap(options[:if])
 options[:if] << "self.validation_context == :#{options[:on]}"

end set_callback(:validation, :before, *(args << options), &block) end`, where the check is added to the end of the options[:if] array, causing the check to run after the :if block.