From: Xeno Campanoli <xcampanoli@...>
Date: 2008-05-25T09:38:39+09:00
Subject: Re: Railsy Question about redefining ruby methods...

David A. Black wrote:
> Hi --
> 
> On Sat, 24 May 2008, Xeno Campanoli wrote:
> 
>> Please this is a Ruby question, not, at least as the main focus, a 
>> rails one, as you'll see if you read all the way through.
> 
> Well, if my answer is correct, it's a very Rails-specific question :-)

Thank you David.  I'll look at this right now, and try to have an answer 
by tomorrow afternoon, as my evening is about to draw me away.'

Sincerely, Xeno
> 
>> Say, I've got a case in Rails where I want all my links to be 
>> prepended with something like ~u1/rrsw/thingies so I can see 
>> http://host/~u1/rrsw/thingies and http://host/~u2/rrsw/thingies 
>> instead of http://host:9001/thingies and http://host:9002/thingies for 
>> a rails tool that is used by some n projects. The rails part is 
>> apparently not configurable, so I'm looking at redefining rails 
>> methods like link_to to stick the path in there.  This should be 
>> reasonable, but I'm stuck on a ruby problem:
>>
>> I want to redefine the link_to method so it's seen in its new guise in 
>> all the places where it's presently used.  It seems to make most sense 
>> to put the new redefinition in the module ApplicationHelpers, but I 
>> believe that may short circuit the access, as I'm not seeing the 
>> example I put in which always puts out a traceable constant, resulting 
>> in the expected changes in my test web pages.  So, and here is the 
>> question:
>>
>> Can anyone suggest how I should specify an appropriately available 
>> method for the correct module inside another module so that it 
>> overrides the original in the fashion I desire?  I presume this is a 
>> simple problem, as it's what people do all the time in OO right?  I'm 
>> still a little green on these patterns yet I think.
> 
> Have a look at relative_url_root, which I believe (though I haven't
> used it in a while) does what you want.
> 
> 
> David
>