Ruby on Rails Ruby on Rails Action Mailer, Background Jobs & Caching 2

Question 1

What Rails command generates a new Active Job class called ProcessPayment?

Accepted Answer

rails generate job ProcessPayment

Answer

rails generate job (or rails g job) creates a new job file in app/jobs/ with a skeleton class and perform method.

Question 2

Which method enqueues an Active Job for asynchronous background processing?

Accepted Answer

perform_later

Answer

perform_later serializes the job arguments and enqueues the job to the configured queue adapter for asynchronous background execution.

Question 3

What is the default queue adapter in a Rails application when no background job gem is configured?

Accepted Answer

:async

Answer

The :async adapter uses an in-process thread pool and is Rails' built-in default, though jobs are lost on server restart since they are not persisted.

Question 4

How do you specify which queue a job should be placed in using Active Job?

Accepted Answer

queue_as :high_priority

Answer

queue_as is a class-level macro in Active Job that sets the queue name for all instances of that job class.

Question 5

Which background job processing gem is most widely used with Ruby on Rails in production?

Accepted Answer

Sidekiq

Answer

Sidekiq is the most popular Rails background job processor, using Redis for job persistence and multi-threaded workers for high throughput.

Ruby on Rails Practice Test

Ruby on Rails Practice Test

Ruby on Rails Ruby on Rails Action Mailer, Background Jobs & Caching 2