Active Job framework in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enqueue a job to run asynchronously.

Ruby on Rails

MyJob.perform_later([1])

Drag options to blanks, or click blank then click option'

Auser_id

Bperform_now

Cenqueue

Dperform_later

Attempts:

3 left

💡 Hint

Common Mistakes

Using perform_now instead of perform_later

Forgetting to pass the job argument

Calling enqueue which is not a method here

Use perform_later with the job argument to enqueue it asynchronously.

2fill in blank

medium

Complete the code to define a job class inheriting from ActiveJob.

Ruby on Rails

class MyJob < [1]
  def perform(user_id)
    # job code here
  end
end

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AApplicationJob

BActiveJob

CJobBase

DActiveJob::Base

Attempts:

3 left

💡 Hint

Common Mistakes

Inheriting from ApplicationJob without defining it

Using just ActiveJob instead of ActiveJob::Base

Using a non-existent class JobBase

Jobs inherit from ActiveJob::Base to get job functionality.

3fill in blank

hard

Fix the error in the job perform method to accept multiple arguments.

Ruby on Rails

def perform([1])
  # code using user_id and message
end

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Auser_id, message

B*args

Cargs

Duser_id message

Attempts:

3 left

💡 Hint

Common Mistakes

Listing multiple arguments without commas

Using a single argument without splat for multiple values

Using an undefined variable name

Use *args to accept multiple arguments in the perform method.

4fill in blank

hard

Fill both blanks to schedule a job to run 5 minutes from now.

Ruby on Rails

MyJob.set(wait: [1]).perform_later([2])

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A5.minutes

B10.seconds

Cuser.id

Duser_id

Attempts:

3 left

💡 Hint

Common Mistakes

Using seconds instead of minutes for delay

Passing the whole user object instead of user ID

Omitting the set method

Use set(wait: 5.minutes) to delay the job, and pass the correct argument.

5fill in blank

hard

Fill all three blanks to retry a job on failure with a maximum of 3 attempts and 5 seconds wait between retries.

Ruby on Rails

class RetryJob < ActiveJob::Base
  retry_on [1], wait: [2], attempts: [3]

  def perform
    # job code
  end
end

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AStandardError

B5.seconds

C3

DRuntimeError

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong error class

Mixing up wait time units

Setting attempts to zero or negative

Use retry_on RuntimeError with wait and attempts options to retry the job.