Deploying ActionCable with Redis to Heroku (according to Michael Hartl)

redis_heroku-setup.txt

1. install redis gem file:
gemfile.rb -> gem 'redis', '3.3.1'

2. bundle install

3. include redistogo addon:
$ heroku addons:create redistogo
(may have to set it up in heroku account dashboard???)

4. update cable.yml:
production:
  adapter: redis
  url: redis://localhost:6379/1

5. pipe the result of heroku config to grep:
$ heroku config | grep REDISTOGO_URL
(sample output):
REDISTOGO_URL: redis://redistogo:c9e21735e8cde14a6fe72@sculpin.redistogo.com:9426/

6. update cable.yml w/ reditogo url:
(sample)
production:
  adapter: redis
  url: redis://redistogo:c9e21735e8cde14a6fe72@sculpin.redistogo.com:9426/
 
7. config production.rb (sample)
config.action_cable.url = 'wss://peaceful-basin-31856.herokuapp.com/cable'
config.action_cable.allowed_request_origins = [
    'https://localhost:8080', /http:\/\/localhost:8080.*/ ]

8. You may need to restart heroku dynos if making changes:
$ heroku restart