Job retries and error handling in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the number of retries for a job.

Ruby on Rails

class MyJob < ApplicationJob
  retry_on StandardError, wait: 5.seconds, attempts: [1]
  def perform
    # job code here
  end
end

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

A5

B10

C0

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Setting attempts to 0 disables retries.

Using a string instead of a number for attempts.

The attempts option sets how many times the job will retry on failure. Here, 5 retries are set.

2fill in blank

medium

Complete the code to handle a specific error type with a custom retry wait time.

Ruby on Rails

class MyJob < ApplicationJob
  retry_on [1], wait: 10.seconds, attempts: 3
  def perform
    # job code here
  end
end

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AStandardError

BActiveRecord::RecordNotFound

CNet::OpenTimeout

DArgumentError

Attempts:

3 left

💡 Hint

Common Mistakes

Using a generic error like StandardError when a specific error is needed.

Choosing an error unrelated to network issues.

The job retries on Net::OpenTimeout errors with a 10-second wait between attempts.

3fill in blank

hard

Fix the error in the retry_on syntax to correctly retry on exceptions.

Ruby on Rails

class MyJob < ApplicationJob
  retry_on StandardError, wait: [1], attempts: 4
  def perform
    # job code here
  end
end

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A5.seconds

B5

C5s

Dseconds(5)

Attempts:

3 left

💡 Hint

Common Mistakes

Using a plain number instead of a duration.

Using invalid syntax like '5s' or 'seconds(5)'.

The wait option requires a duration object like 5.seconds, not a plain number.

4fill in blank

hard

Fill both blanks to correctly rescue an error and retry the job with a delay.

Ruby on Rails

class MyJob < ApplicationJob
  rescue_from [1] do |exception|
    retry_job wait: [2]
  end
  def perform
    # job code here
  end
end

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AActiveRecord::Deadlocked

BStandardError

C10.seconds

D5.minutes

Attempts:

3 left

💡 Hint

Common Mistakes

Using a generic error instead of the specific deadlock error.

Setting the wait time to a non-duration value.

The job rescues ActiveRecord::Deadlocked errors and retries after 10 seconds.

5fill in blank

hard

Fill all three blanks to create a job that retries on two errors with different wait times.

Ruby on Rails

class MyJob < ApplicationJob
  retry_on [1], wait: [2], attempts: 3
  retry_on [3], wait: 20.seconds, attempts: 2
  def perform
    # job code here
  end
end

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ANet::OpenTimeout

B15.seconds

CActiveRecord::Deadlocked

DStandardError

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up error classes and wait times.

Using non-duration values for wait times.

The job retries on StandardError with a 15-second wait and on ActiveRecord::Deadlocked with a 20-second wait.