devise_sociable

This gem adds the ability to see who’s currently online to devise. You can use it with server side or cookie based sessions.

Usage

If you use server side sessions and have that setup, there is no migration needed.

If you use cookie sessions (this is the Rails default):

rails g devise_sociable
rake db:migrate

In your model, add :sociable:

class User < ActiveRecord::Base
  devise ..., :sociable
end

Thanks to devise_lastseenable which led me down the path of creating this gem.