From: Jano Svitok <jan.svitok@...>
Date: 2008-04-11T20:28:54+09:00
Subject: Re: Trying (and failing) to load specific version of gem

On Fri, Apr 11, 2008 at 1:18 PM, Brian Candler <B.Candler@pobox.com> wrote:
> I wonder if someone can help with a problem which I'm sure is very simple
>  and obvious, but I'm tearing my hair out.
>
>  I have rubygems 1.0.1 installed. I have two gems of ActiveRecord installed
>  (1.15.3 and 2.0.2). I simply want a program to run using 1.15.3.
>
>  Here are the different ways I've tried to do it, all of which fail with the
>  exceptions shown:
>
>     require 'rubygems'
>     gem 'activerecord', '=1.15.3'
>     ActiveRecord  # >> uninitialized constant ActiveRecord
>
>     require 'rubygems'
>     gem 'activerecord', '=1.15.3'
>     require 'activerecord'  # >>  can't activate activerecord (= 2.0.2), already activated activerecord-1.15.3]
>
>     require 'rubygems'
>     require_gem 'activerecord', '=1.15.3'  # >> undefined method require_gem
>
>     require 'rubygems'
>     require 'activerecord', '=1.15.3'  # >> wrong number of arguments (2 for 1)
>
>     require 'rubygems'
>     require 'gemconfigure'
>     Gem.configure([['activerecord','=1.15.3']])
>     ActiveRecord  # >> uninitialized constant ActiveRecord
>
>     require 'rubygems'
>     require 'gemconfigure'
>     Gem.configure([['activerecord','=1.15.3']])
>     require 'activerecord'  # >> can't activate activerecord (= 2.0.2), already activated activerecord-1.15.3]
>
>  I see that rubygems-1.1.0 and 1.1.1 have now been released, but see nothing
>  in the changelogs which suggest that this was a known or fixed issue.
>  Equally, this is such core behaviour that it can't be broken, or someone
>  else would have noticed, so I'm sure I'm simply doing it wrong.
>
>  Could someone enlighten me please? I am failing to get it to DWIM :-)
>
>  Thanks,
>
>  Brian.

http://rubyforge.org/tracker/index.php?func=detail&aid=16739&group_id=126&atid=575