This ensures that devise will update a last_seen timestamp on the model whenever you check if a user is authenticated.
Add to your Gemfile:
Add the last_seen column to your database. Assuming your Devise model is called User, run:
rails generate devise_lastseenable User rake db:migrate
In your model, add :lastseenable as such:
class User < ActiveRecord::Base devise ..., :lastseenable end
Thanks to devise_traceable for essentially operating as the base for this gem!
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