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Using session data to find out who is online

I want to know who logs into my web application and be able to print a list of registered users. I also want to be able to print who is viewing a specific section of the application (for example chatting so that I can print chat users).

At the moment I only have:

session[:role_id] = @role_id

when someone enters the application.

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2 answers


You can use before_filter to catch the user every time the user makes a request to the server. Using updated_at attribute current_user (or whatever you call get user logged_in )

simple example using before_filter :

class RubyDevelopersController < ChatRoomController

 # every time the request hits the server a call is sent to register the user
 before_filter :register_user

 private

 def register_user

    # the current_user model is updated with the name  
    # of the chatroom he hidding in.
    # remember that this call also updates updated_at field of the current_user
    current_user.update_attribute( :current_chatroom, 'ruby_developers' )
 end

 def ative_users_in_ruby_developers_chatroom
  # find all users in the current chatroom that has been updated_at in the last 5 minutes.
  Users.find( :all, {
   :conditions => ["current_chatroom = ? and updated_at > ?",'ruby_developers', 5.minutes.ago ],
   :sort => 'updated_at'
  })
 end
end


also see:

http://railsforum.com/viewtopic.php?pid=66001

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If you are storing session data in a database, I suppose you could just create a model that maps to the session table and query the table for a list of users. If all session data is stored in cookies, the previous answer is more ideal.



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