Heroku - how to start job worker (delayed job)?

Question

I have some miniapp that use delayed_job. On my localhost everything works fine, but when I deploy my app to Heroku and click on the link that should be executed by delayed_job, so nothing happen, the "task" is just saved into the table delayed_job.

In this article on heroku blog is written, that the task from delayed_job table is executed, when is run this command rake jobs:work.

But how can I run this command? Where should be the command placed? In the code, or from terminal console?

Answer 1

If you are running the Cedar stack, run the following from the terminal console:

heroku run rake jobs:work

If you are running the older stacks (Bamboo, Aspen, etc.):

heroku rake jobs:work

see: https://devcenter.heroku.com/articles/rake

According to the delayed_job documentation, you can also start a worker programmatically:

#!/usr/bin/env ruby
require File.dirname(__FILE__) + '/../config/environment'

Delayed::Worker.new.start 

Answer 2

You should use a Procfile to scpecify the commands for your dynos. For example you would have something like this in your Procfile:

appDir/Procfile

web:     bundle exec rails server -p $PORT 
worker:  bundle exec rake jobs:work

To use this on your development machine, you should use Foreman, it's all explained at the docs.

https://devcenter.heroku.com/articles/procfile