ActionCable - how to display number of connected users?

Question

I'm trying to create a simple chat-like application (planning poker app) with Action Cable. I'm a little bit confused by the terminology, files hierarchy and how the callbacks work.

This is the action that creates user session:

class SessionsController < ApplicationController
  def create
    cookies.signed[:username] = params[:session][:username]
    redirect_to votes_path
  end
end

A user can then post a vote that should be broadcasted to everyone:

class VotesController < ApplicationController
  def create
    ActionCable.server.broadcast 'poker',
                                 vote: params[:vote][:body],
                                 username: cookies.signed[:username]
    head :ok
  end
end

Up to this point everything is clear for me and works fine. The problem is - how do I display the number of connected users? Is there a callback that fires in JS when a user (consumer?) connects? What I want is when I open 3 tabs in 3 different browsers in incognito mode I would like to display "3". When a new user connects, I would like the number to increment. If any user disconnects, the number should decrement.

My PokerChannel:

class PokerChannel < ApplicationCable::Channel
  def subscribed
    stream_from 'poker'
  end
end

app/assets/javascripts/poker.coffee:

App.poker = App.cable.subscriptions.create 'PokerChannel',

  received: (data) ->
    $('#votes').append @renderMessage(data)

  renderMessage: (data) ->
    "<p><b>[#{data.username}]:</b> #{data.vote}</p>"

Answer 1

Seems that one way is to use

ActionCable.server.connections.length

(See caveats in the comments)