ruby - Rails ActionCable unsubscribe users when browser close -

i'm testing actioncable simple example. want see how many users connected @ time on website. users not registered in system. users assigned session variable uuid. make example simple possible have not included model or database.

#app/controller/users_controller.rb  class userscontroller < applicationcontroller     def index     if session[:user].nil?       session[:user] = securerandom.uuid     end     @user = session[:user]     userbroadcastjob.perform_later @user     end   end 

views simple

#app/views/users/index.html.erb  <h1>users</h1>  <div id="users">   <%= render "user",user: @user %> </div> 

partial users:

#app/views/users/_user.html.erb  <div class="user">   user : <%= user %> </div> 

i use job call socket

#app/jobs/user_broadcast_job.rb  class userbroadcastjob < applicationjob queue_as :default    def perform(user)     actioncable.server.broadcast 'user_channel', message: render_user(user)   end    def render_user(user)     applicationcontroller.renderer.render(partial: 'users/user', locals: { user: user })   end end 

and channel

app.user = app.cable.subscriptions.create "userchannel", connected: ->  disconnected: ->  received: (data) -> console.log(data) $("#users").prepend(data.message) 

this works correctly. in each browser open uuid connected visible. not use database persistence, first open browser has uuid , rest of browsers goes n-1 uuid visible. it's not important.

my question is:

if browser closes, how can send message delete uuid template?

actioncable not work sessions.

ruby version: 2.4.0 rails version: 5.1.3 jquery installed via yarn

thanks!!!!

you can under

  def unsubscribed     # cleanup needed when channel unsubscribed   end 

in channels/application_cable/your_channel.rb

besides, actioncable does work sessions, takes bit of tweaking though.

if you're serious testing concurrency of actioncable (i.e have serious thoughts using actioncable in upscale production), kind of advise give , plugin anycable. save ton of time.