From: Brian Candler <b.candler@...>
Date: 2008-11-17T05:34:26+09:00
Subject: Re: erb & action_view outside rails

David Lewis wrote:
> OK, makes sense, except...
> 
> Your response gave me a clue to get through the requires, namely prepend 
> -- require 'action_controller'.  But then I've still gotta deal with all 
> the controller infrastructure that gets pulled in, so I think your 
> impression is correct.

If you think about it: url_for relies very heavily on the action 
controller routing infrastructure. For example,

   url_for(:controller=>:foo, :action=>:new, :id=>123)

might map to /widget/new/123 or /widget/123/new depending on what map 
lines existed in the routes.rb file (or could not be mapped at all if 
there is no matching route). Furthermore, if you don't provide 
:controller or :action then these default to those in the current 
request, but standalone template generation doesn't have a concept of 
"current request".

The following may be relevant to you:
http://railscasts.com/episodes/132-helpers-outside-views

It warns that many URL-related helper methods may not make sense outside 
of actionpack's view layer.
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