From: Michael Schuerig <michael@...>
Date: 2005-09-18T22:27:54+09:00
Subject: Re: Finding out if a method is already redefined

David A. Black wrote:

> Hi --
> 
> On Sun, 18 Sep 2005, Michael Schuerig wrote:
> 
>>
>> My problem occurs in the context of Rails, but is really core Ruby.
>> In its "development environment" Rails uses load, not require, to
>> load files anew for each request. This is to enable changes to the
>> running application. I'm running into a problem with this mechanism
>> when redefining a method *and* referring to the old method in the
>> redefined one. When this redefinition happens twice, it results in an
>> infinite recursion. I've tried to guard the redefinition with a check
>> for the new method, but this doesn't work, the new alias is not
>> recognized.
>>
>>  unless method_defined?(:method_new)
>>    alias_method :method_old, :method
>>    def method_new(options = {})
>>      ...
>>      method_old(options)
>>    end
>>    alias_method :method, :method_new
>>  end
>>
>> What do I have to do to make this work?
> 
> I can't duplicate your problem.  Here's what I'm doing:
[example snipped]

Yes, I know, I tried the same and outside of Rails it works nicely.
Apparently, Rails does more things than simply re-loading.

Michael

-- 
Michael Schuerig                  There is no matrix,
mailto:michael@schuerig.de        only reality.
http://www.schuerig.de/michael/   --Lawrence Fishburn