Rails - Jun 2006 - dynamic session domain

I''m trying to use one Rails app on different domains at the same time.
I
also use subdomains. According to some tip I use:

session :session_domain => ''.domain.tld''

in application.rb

How can I access request object so I can do:

session :session_domain => "." + 
request.host.split(''.'')[-3..-1].join(''.'')


Thanks


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