From: Tim Pease <tim.pease@...>
Date: 2007-01-13T04:51:02+09:00
Subject: Re: Rake, Hoe, Meta-Programming, and Warnings (oh my!)

On 1/12/07, James Edward Gray II <james@grayproductions.net> wrote:
> On Jan 12, 2007, at 11:24 AM, Tim Pease wrote:
>
> > The warnings are coming from some meta-programming code that is
> > redefining instance methods on the fly based on user input. So maybe a
> > better question would be, is there a way to redefine methods without
> > causing Ruby to spew out a warning each time the method is redefined.
>
> Sure.  Watch:
>
> #!/usr/bin/env ruby -w
>
> class Test
>    def override
>      "original"
>    end
> end
>
> Test.new.override  # => "original"
>
> class Test
>    def override # !> method redefined; discarding old override
>      "warning"
>    end
> end
>
> Test.new.override  # => "warning"
>
> class Test
>    undef :override
>    def override
>      "no warning"
>    end
> end
>
> Test.new.override  # => "no warning"
>
> class Test
>    alias_method :old_override, :override
>    def override
>      "alias avoids warning too"
>    end
> end
>
> Test.new.override  # => "alias avoids warning too"
>
> __END__
>
> Hope that helps.
>

Hey James!  That did the trick.

I could have sworn that I tried undef before, but in my current sleep
deprived state I'm not too sure about it.  Hmmm ... I most likely did
try undef, but it chucked an exception at me when I tried to undef a
non-existent method.

Now using undef along with method_defined?

All is well :)

Blessings,
TwP