Rails: how to show user's “last seen at” time?

Question

I\'m using devise which stores current_sign_in_at and last_sign_in_at datetimes.

But lets say a user logged in a month ago but last vie

Answer 1

To improve performance of the previous answer:

• don't use session, as user already loaded with warden and all the attributes are accessible
• update_attribute runs callbacks and updates updated_at attribute, and update_column not
• to improve performance, better to use background workers, like ActiveJob/Resque/Sidekiq
• to prevent from the high DB locking, better to create a seperate table, associated with users table, and write accesses there

Updated code:

before_action :set_last_seen_at, if: proc { user_signed_in? && (user.last_seen_at.nil? || user.last_seen_at < 15.minutes.ago) }

private
def set_last_seen_at
  current_user.update_column(:last_seen_at, Time.now)
end

Devise plugin makes similar behaviour happen (just last seen, without optimizations): https://github.com/ctide/devise_lastseenable