Rails - Nov 2006 - using sessions to find who is online

Hello -

I have written a rails application that, when users authenticate, stores
their id into the session like this:

session[:user] = user.id

Simple enough.  I store my sessions using the ActiveRecord Store.  When
users logout, the session is erased from the database.

I would like to be able to determine who is online at any particular time by
looking at this session table.  I have a Session object, and tried this:

@current_sessions = Session.find(:all)
@teachers_online = []
@current_sessions.each do |sess|
      @teachers_online << User.find(sess[:user])
end

But that doesn''t work.  Rails doesn''t seem to see these
sessions like "real"
sessions.

Does anyone know how to make this work?

Thanks,
Shelby
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