caboose

Inspired by Jim Weirich's "10 Things Every Java Programmer Should Know About Ruby":http://onestepback.org/articles/10things/index.html presentation, Courtenay had a wicked thought. What if you could proxy objects for debugging purposes?

class Proxy
  attr_reader :messages, :context
  delegate :class, :to => :context
  delegate :is_a?, :to => :context

  def initialize(context)
    @context  = context
    @messages = []
  end

  private
    def method_missing(method, *args, &block)
      start = Time.now
      @context.send(method, *args, &block)
    ensure
      @messages << [method, args, block, Time.now - start]
    end
end

Let's see this bad boy in action:

>> project-mayhem-2:~/p/mephisto/trunk rick$ script/console
Loading development environment.
>> Article = Proxy.new(Article)
(irb):1: warning: already initialized constant Article
=> #
>> Article.count
=> 52
>> a = Proxy.new(Article.find(:first)) ; nil
=> nil
>> Article.messages
=> [[:count, [], nil, 0.054313], [:allocate, [], nil, 4.1e-05], [:find, [:first], nil, 0.012639]]
>> a.title += ' updated'
=> "SimpleXML and Xpath in Php5 updated"
>> a.messages
=> [[:title, [], nil, 0.006489], [:title=, ["SimpleXML and Xpath in Php5 updated"], nil, 9.5e-05]]