Using Delayed Job (DJ) to Handle Background Tasks
Delayed_job lets you run background tasks with your Rails application. It uses your database as a queue to process background jobs. If your app has a high database load, using delayed_job may not be a good background queuing library for your project and you should have a look at Sidekiq or Resque.
delayed_job to your Project
To get started using delayed_job you need to configure your application.
# With MySQL or PostgreSQL gem 'delayed_job_active_record' # OR if you're using MongoDB gem 'delayed_job_mongoid'
bundle install to install the gem.
If you are using MySQL or PostgreSQL, you also need to apply migrations to your database:
rails generate delayed_job:active_record rake db:migrate
That’s it, your application is ready! You can find more information on their GitHub page.
Adding ‘delayedjob’ container type in your Procfile
delayed_job has been installed, you need to add a new type of containers
in your application which will actually start delayed_job. Add the following
line to the
your project. Create the file if it doesn’t exist.
delayedjob: bin/delayed_job run
Do not use
delayed_job startto start the process.
startstarts the process in background and our crash detection system will consider it as crashed, it has to run in the foreground thanks to the
All you have to do now is to write your jobs by following delayed_job documentation and deploy your code:
git add Gemfile Gemfile.lock Procfile git commit -m "Add delayed job" git push scalingo master
The process won’t be started directly, but by going to the dashboard of your
application or by running the
scalingo ps command, you’ll see that’s the new
container type is present, just scale it to 1 to start it.