Rails - Mar 2006 - Storing sessions files elsewhere on EdgeRails

Hi all,


In a Rails 1.0 project, I successfully changed the sessions storage 
location to <RAILS-ROOT>/tmp, by adding

 
ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS.update(:tmpdir => 
File.join(RAILS_ROOT, ''/tmp''))
in environment.rb

Problem:
--------
I tried to use the same trick in an EdgeRails project, but it doesn''t 
work : server error, with no msg in the logs.
(MacOS X, with Locomotive.)

When I start the console, I get a new error:

   Loading development environment.
   ./script/../config/../config/environment.rb:47:NameError: 
uninitialized constant ActionController
 
./script/../config/../config/../vendor/rails/actionpack/lib/action_controller/integration_test.rb:16:NameError:

       uninitialized constant   ActionController::Integration::Session::Test
    >>


Any idea?

Alain