Rails - Jul 2012 - Disallowing multiple login by same user using different browsers

Hi,

I need to create an app where one user cannot login using multiple 
browsers. As soon as he does, the previous one logs out.

I have a user table with a field named "current_sign_in_token'' to
store the
session key generated by one login. 
But I am not able to retrieve the session key. Actually I don''t know 
exactly how to do it. Have been following several posts but in vain.

Following is my initializers/session_store.rb file

Contactapp::Application.config.session_store :cookie_store,{ :key =>
> ''_contactapp_session'',
>  :secret => 
>
''[kjhafdhbcrekjbwrewhbvwbvlwruhfwlkevjnwlghbwljtvhblwevblswetbvlwrnvjnsklejvni45uhvgiwlu758t75fblwbcw...]'',
>
>  :expire_after => 5.minutes}
>
I am trying to retrieve *request.session_options[:id]* in my controller but 
it doesn''t returns any value. But it does returns values when I use it
in a
view.
 
The value Rails.application.config.session_options[:key] doesn''t seems
to
satisfy what I need to do as it just returns the values 
''_contactapp_session''.

What shall I do next. Am stuck.

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