How do you schedule Resque jobs on Heroku? - ruby-on-rails

Question

The rescue-scheduler gem installation says to create a separate Rake task for scheduling:
https://github.com/resque/resque-scheduler#rake-integration
namespace :resque do
task :setup_schedule => :setup do
...
task :scheduler => :setup_schedule
$ rake resque:scheduler
However my Heroku Procfile already has a worker process to run Resque:
resque: env TERM_CHILD=1 RESQUE_TERM_TIMEOUT=7 QUEUE=* bundle exec rake resque:work COUNT=1
I don't want to create yet another worker process just to run scheduled jobs. This old blog posts says you can set it up without using Rake tasks.
https://www.perfectline.co/blog/2011/07/cron-tasks-for-your-rails-application-with-resque-2/
How do you schedule Resque jobs on Heroku without use 2 worker dynos?
I tried to add multiple dependencies but it gave me a circular dependency error.
namespace :resque do
task :setup => [:environment, :scheduler]
Console
>env TERM_CHILD=1 RESQUE_TERM_TIMEOUT=7 QUEUE=* bundle exec rake resque:work COUNT=1
rake aborted!
Circular dependency detected: TOP => resque:work => resque:preload => resque:setup => resque:scheduler => resque:setup_schedule => resque:setup
Tasks: TOP => resque:work => resque:preload => resque:setup => resque:scheduler => resque:setup_schedule

Answer 1

This works
https://grosser.it/2012/04/14/resque-scheduler-on-heroku-without-extra-workers/
require 'resque/tasks'
require 'resque/scheduler/tasks'
namespace :resque do
desc "schedule and work, so we only need 1 dyno"
task :schedule_and_work do
if Process.respond_to? :fork
if Process.fork
sh "rake environment resque:work"
else
sh "rake resque:scheduler"
Process.wait
end
else # windows
pid = Process.spawn "rake environment resque:work"
Rake::Task["resque:scheduler"].invoke
Process.wait pid
end
end
task :setup => :environment
task :setup_schedule => :setup do
require 'resque-scheduler'
# The schedule doesn't need to be stored in a YAML, it just needs to
# be a hash. YAML is usually the easiest.
# Resque.schedule = YAML.load_file('your_resque_schedule.yml')
Resque.schedule = {merit_rules: {every: '1m', class: 'Merit::ReputationChangeObserver', queue: :badge_queue,
description: 'This job runs Merit\'s rules to award badges.'}}
end
task :scheduler => :setup_schedule
end
And to launch it
env TERM_CHILD=1 RESQUE_TERM_TIMEOUT=7 QUEUE=* bundle exec rake resque:schedule_and_work COUNT=1