Specified 'redis' for Action Cable pubsub adapter, but the gem is not loaded

Question

I am trying to push my application to production which is using action cable. every time i push it gives me an error saying:

ERROR -- Specified 'redis' for Action Cable pubsub adapter, but the gem is not loaded. Add `gem 'redis'` to your Gemfile (and ensure its version is at the minimum required by Action Cable).: nil

My Gem file is like:

group :development do
 # Access an IRB console on exception pages or by using <%= console %> in views
 gem 'web-console', '~> 3.0'
 gem 'listen', '~> 3.0.5'
 gem 'spring'
 gem 'spring-watcher-listen', '~> 2.0.0'
 gem 'em-hiredis'
 gem 'redis', '~> 3.0'
end

and My Cable.yml is like:

production:
  adapter: redis
  url: redis://localhost:6379/1

development:
  adapter: async

test:
  adapter: async

How should i fix it and make my action cable work on develop.

Gemlock whole: This is gem file and redis is specified as redis (~> 3.0)

GEM
    remote: https://rubygems.org/
    specs:
      actioncable (5.0.6)
        actionpack (= 5.0.6)
        nio4r (>= 1.2, < 3.0)
        websocket-driver (~> 0.6.1)
      actionmailer (5.0.6)
        actionpack (= 5.0.6)
        actionview (= 5.0.6)
        activejob (= 5.0.6)
        mail (~> 2.5, >= 2.5.4)
        rails-dom-testing (~> 2.0)
      actionpack (5.0.6)
        actionview (= 5.0.6)
        activesupport (= 5.0.6)
        rack (~> 2.0)
        rack-test (~> 0.6.3)
        rails-dom-testing (~> 2.0)
        rails-html-sanitizer (~> 1.0, >= 1.0.2)
      actionview (5.0.6)
        activesupport (= 5.0.6)
        builder (~> 3.1)
        erubis (~> 2.7.0)
        rails-dom-testing (~> 2.0)
        rails-html-sanitizer (~> 1.0, >= 1.0.3)
      activejob (5.0.6)
        activesupport (= 5.0.6)
        globalid (>= 0.3.6)
      activemodel (5.0.6)
        activesupport (= 5.0.6)
      activerecord (5.0.6)
        activemodel (= 5.0.6)
        activesupport (= 5.0.6)
        arel (~> 7.0)
      activesupport (5.0.6)
        concurrent-ruby (~> 1.0, >= 1.0.2)
        i18n (~> 0.7)
        minitest (~> 5.1)
        tzinfo (~> 1.1)
      arel (7.1.4)
      bcrypt (3.1.11)
      bindex (0.5.0)
      builder (3.2.3)
      byebug (9.1.0)
      coderay (1.1.2)
      coffee-rails (4.1.1)
        coffee-script (>= 2.2.0)
        railties (>= 4.0.0, < 5.1.x)
      coffee-script (2.4.1)
        coffee-script-source
        execjs
      coffee-script-source (1.12.2)
      concurrent-ruby (1.0.5)
      crass (1.0.2)
      devise (4.3.0)
        bcrypt (~> 3.0)
        orm_adapter (~> 0.1)
        railties (>= 4.1.0, < 5.2)
        responders
        warden (~> 1.2.3)
      em-hiredis (0.3.1)
        eventmachine (~> 1.0)
        hiredis (~> 0.6.0)
      erubis (2.7.0)
      eventmachine (1.2.5)
      execjs (2.7.0)
      ffi (1.9.18)
      globalid (0.4.1)
        activesupport (>= 4.2.0)
      hiredis (0.6.1)
      i18n (0.9.1)
        concurrent-ruby (~> 1.0)
      jbuilder (2.7.0)
        activesupport (>= 4.2.0)
        multi_json (>= 1.2)
      jquery-rails (4.3.1)
        rails-dom-testing (>= 1, < 3)
        railties (>= 4.2.0)
        thor (>= 0.14, < 2.0)
      listen (3.0.8)
        rb-fsevent (~> 0.9, >= 0.9.4)
        rb-inotify (~> 0.9, >= 0.9.7)
      loofah (2.1.1)
        crass (~> 1.0.2)
        nokogiri (>= 1.5.9)
      mail (2.7.0)
        mini_mime (>= 0.1.1)
      method_source (0.9.0)
      mini_mime (0.1.4)
      mini_portile2 (2.3.0)
      minitest (5.10.3)
      multi_json (1.12.2)
      nio4r (2.1.0)
      nokogiri (1.8.1)
        mini_portile2 (~> 2.3.0)
      orm_adapter (0.5.0)
      pg (0.21.0)
      pry (0.11.2)
        coderay (~> 1.1.0)
        method_source (~> 0.9.0)
      pry-byebug (3.5.0)
        byebug (~> 9.1)
        pry (~> 0.10)
      puma (3.10.0)
      rack (2.0.3)
      rack-test (0.6.3)
        rack (>= 1.0)
      rails (5.0.6)
        actioncable (= 5.0.6)
        actionmailer (= 5.0.6)
        actionpack (= 5.0.6)
        actionview (= 5.0.6)
        activejob (= 5.0.6)
        activemodel (= 5.0.6)
        activerecord (= 5.0.6)
        activesupport (= 5.0.6)
        bundler (>= 1.3.0)
        railties (= 5.0.6)
        sprockets-rails (>= 2.0.0)
      rails-dom-testing (2.0.3)
        activesupport (>= 4.2.0)
        nokogiri (>= 1.6)
      rails-html-sanitizer (1.0.3)
        loofah (~> 2.0)
      railties (5.0.6)
        actionpack (= 5.0.6)
        activesupport (= 5.0.6)
        method_source
        rake (>= 0.8.7)
        thor (>= 0.18.1, < 2.0)
      rake (12.2.1)
      rb-fsevent (0.10.2)
      rb-inotify (0.9.10)
        ffi (>= 0.5.0, < 2)
      redis (3.3.5)
      responders (2.4.0)
        actionpack (>= 4.2.0, < 5.3)
        railties (>= 4.2.0, < 5.3)
      sass (3.5.3)
        sass-listen (~> 4.0.0)
      sass-listen (4.0.0)
        rb-fsevent (~> 0.9, >= 0.9.4)
        rb-inotify (~> 0.9, >= 0.9.7)
      sass-rails (5.0.6)
        railties (>= 4.0.0, < 6)
        sass (~> 3.1)
        sprockets (>= 2.8, < 4.0)
        sprockets-rails (>= 2.0, < 4.0)
        tilt (>= 1.1, < 3)
      semantic-ui-sass (2.2.12.0)
        sass (>= 3.2)
      slim (3.0.8)
        temple (>= 0.7.6, < 0.9)
        tilt (>= 1.3.3, < 2.1)
      slim-rails (3.1.3)
        actionpack (>= 3.1)
        railties (>= 3.1)
        slim (~> 3.0)
      spring (2.0.2)
        activesupport (>= 4.2)
      spring-watcher-listen (2.0.1)
        listen (>= 2.7, < 4.0)
        spring (>= 1.2, < 3.0)
      sprockets (3.7.1)
        concurrent-ruby (~> 1.0)
        rack (> 1, < 3)
      sprockets-rails (3.2.1)
        actionpack (>= 4.0)
        activesupport (>= 4.0)
        sprockets (>= 3.0.0)
      temple (0.8.0)
      thor (0.20.0)
      thread_safe (0.3.6)
      tilt (2.0.8)
      turbolinks (5.0.1)
        turbolinks-source (~> 5)
      turbolinks-source (5.0.3)
      tzinfo (1.2.4)
        thread_safe (~> 0.1)
      uglifier (3.2.0)
        execjs (>= 0.3.0, < 3)
      warden (1.2.7)
        rack (>= 1.0)
      web-console (3.5.1)
        actionview (>= 5.0)
        activemodel (>= 5.0)
        bindex (>= 0.4.0)
        railties (>= 5.0)
      websocket-driver (0.6.5)
        websocket-extensions (>= 0.1.0)
      websocket-extensions (0.1.2)

  PLATFORMS
    ruby

  DEPENDENCIES
    byebug
    coffee-rails (~> 4.1.0)
    devise
    em-hiredis
    jbuilder (~> 2.0)
    jquery-rails
    listen (~> 3.0.5)
    pg
    pry-byebug
    puma
    rails (>= 5.0.0.beta3, < 5.1)
    redis (~> 3.0)
    sass-rails (~> 5.0)
    semantic-ui-sass
    slim-rails
    spring
    spring-watcher-listen (~> 2.0.0)
    turbolinks (~> 5.x)
    tzinfo-data
    uglifier (>= 1.3.0)
    web-console (~> 3.0)

  BUNDLED WITH
     1.16.0

Answer 1

My solution to this issue was in the Gemfile

gem 'redis', '~> 4.0'

And follow this deploy guide to heroku:

https://blog.heroku.com/real_time_rails_implementing_websockets_in_rails_5_with_action_cable#deploying-our-application-to-heroku

Answer 2

I had the same issue. I solved it by updating my gems via (bundle update). Not sure which gem exactly solved it.

Now I have: ruby 2.5.0, rails 5.1.5, redis 4.0.1, actioncable 5.1.5.

Answer 3

I see two separate issues:

1. In your gemfile you are specifying the redis gem for only the development environment. Make sure to take the line gem 'redis', '~> 3.0' and put it outside the group :development block. That way it will be included in the production gems.

2. Your redis URL is pointing to localhost for production. That will not work, you will need to point it to a redis url that is available remotely. If you are using Heroku, you can use the redis add-on.