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1# Code sample to determine if a user has been recently online
2# Using restful_authentication or acts_as_authenticated
3# By emili.parreno AT gmail.com // jaimeiniesta AT gmail.com
4
5## migration to add last_seen_at to users
6
7class AddLastSeenAtToUsers < ActiveRecord::Migration
8  def self.up
9    add_column :users, :last_seen_at, :datetime, :default => "2000-01-01"
10  end
11
12  def self.down
13    remove_column :users, :last_seen_at
14  end
15end
16
17## apps/controllers/application.rb
18
19class ApplicationController < ActionController::Base  
20  before_filter :update_last_seen_at
21
22  def update_last_seen_at
23    if logged_in? and current_user.last_seen_at + 5.minutes < Time.now
24      @user = User.find(current_user.id)
25      @user.update_attribute("last_seen_at" ,Time.now)
26    end
27  end  
28end
29
30## apps/models/user.rb
31
32class User < ActiveRecord::Base
33  def is_online?
34    last_seen_at + 5.minutes > Time.now
35  end
36end