Devise extension for logging current active users using only the fast Rails cache. This gem is for if you don't want long-term storage of this information and don't want to write to your database all the time.
# Gemfile
gem 'devise_whos_here'# app/models/user.rb
devise :database_authenticatable, :confirmable, :whos_hereThis will keep track of your logged in users with a variable in the Rails cache. Note all below times are returned as Time objects, not strings.
User.last_active_since(30.minutes.ago) # returns an array of User objects
user = User.first
user.last_here_at # returns last known request timeWhenever you want to clear the cache simply run
User.clear_whos_here!Created by Weston Ganger - @westonganger