troubleshooting warnings

[Chase A James]

So I was getting a warning while running my specs (specifically "warning: Time#succ is obsolete; use time + 1"), but I didn't know what was causing it. It was printing the warning for every second in a time range =).

After doing some research, I learned that there isn't an obvious way to get the backtrace of a warning (i.e. make Ruby warnings fatal). I finally ended up hacking

activesupport-3.1.10/lib/active_support/time_with_zone.rb and added the line "puts caller.inspect if sym == :succ" to method_missing to get the calling methods and the line number. 

Kernel#caller gives you an array of every calling method, which is like a backtrace without throwing an exception.

Hope this was informative for any other rubyists missing some warnings and Kernel methods knowledge!

[Todd Willey]

Would it have worked to just reopen the class instead of editing your installed gems?  Something like:

class Time

  alias_method :original_succ, :succ

  def succ

    puts caller.inspect

    original_succ

  end

end

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[Chase A James]

Yeah, that's much nicer. I probably could have just reopened Kernel.warn as well.