Background email delivery in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to send an email asynchronously using Active Job.

Ruby on Rails

UserMailer.welcome_email(user).[1]

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

Adeliver_later

Bdeliver_now

Csend_now

Dsend_later

Attempts:

3 left

💡 Hint

Common Mistakes

Using deliver_now sends email immediately, not in background.

Using deliver_later queues the email to be sent in the background.

2fill in blank

medium

Complete the code to define a mailer method that sends a welcome email.

Ruby on Rails

def welcome_email(user)
  @user = user
  mail(to: @user.email, subject: [1])
end

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

AWelcome to our site!

B"Welcome to our site!"

C:welcome

Duser.email

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting quotes causes syntax errors.

The subject option requires a string with quotes.

3fill in blank

hard

Fix the error in the Active Job class to perform email delivery.

Ruby on Rails

class UserMailerJob < ApplicationJob
  queue_as :default

  def perform(user)
    UserMailer.welcome_email([1]).deliver_now
  end
end

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

Auser

B@user

CUser

Dself

Attempts:

3 left

💡 Hint

Common Mistakes

Using @user causes undefined variable error.

The method receives user as argument and should pass it to the mailer.

4fill in blank

hard

Fill both blanks to enqueue the mailer job with the user argument.

Ruby on Rails

UserMailerJob.[1]([2])

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

Aperform_later

Bperform_now

Cuser

DUser

Attempts:

3 left

💡 Hint

Common Mistakes

Using perform_now runs job immediately, not in background.

perform_later enqueues the job; user is the argument passed.

5fill in blank

hard

Fill all three blanks to create a hash of emails and subjects for users with more than 5 posts.

Ruby on Rails

emails = users.select { |user| user.posts.count [2] 5 and user.active? == [3] }.map { |user| [user.email, [1]] }.to_h

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

A"Welcome!"

B>

Ctrue

Duser.name

Attempts:

3 left

💡 Hint

Common Mistakes

Using string 'true' instead of boolean true.

Use user.name for the subject, check if posts count is greater than 5, and active status is true.