Active Job framework in Ruby on Rails - Mini Project: Build & Apply

Background Email Sending with Active Job

📖 Scenario: You are building a Rails app that sends welcome emails to new users. To avoid slowing down the app, you want to send emails in the background using Active Job.

🎯 Goal: Build a simple Active Job class that sends a welcome email asynchronously when a new user is created.

📋 What You'll Learn

Create a job class called WelcomeEmailJob

Add a perform method that calls UserMailer.welcome_email(user)

Enqueue the job with a user instance

Configure the job to use the async adapter

💡 Why This Matters

🌍 Real World

Background jobs like sending emails improve user experience by not blocking web requests.

💼 Career

Understanding Active Job is essential for Rails developers to build scalable and responsive applications.

1

Create the WelcomeEmailJob class

Create a job class called WelcomeEmailJob that inherits from ApplicationJob.

Ruby on Rails

# Your code here

Need a hint?

Use class WelcomeEmailJob < ApplicationJob to define the job class.

2

Add the perform method

Inside WelcomeEmailJob, add a perform method that takes a user parameter and calls UserMailer.welcome_email(user).deliver_now.

Ruby on Rails

class WelcomeEmailJob < ApplicationJob
  # Your code here
end

Need a hint?

The perform method is where the job does its work.

3

Enqueue the job with a user instance

Write code to enqueue WelcomeEmailJob with a variable called user using perform_later.

Ruby on Rails

class WelcomeEmailJob < ApplicationJob
  def perform(user)
    UserMailer.welcome_email(user).deliver_now
  end
end

# Your code here

Need a hint?

Use perform_later to enqueue the job asynchronously.

4

Configure Active Job to use async adapter

Set the Active Job queue adapter to :async by adding config.active_job.queue_adapter = :async inside the Rails.application.configure block.

Ruby on Rails

class WelcomeEmailJob < ApplicationJob
  def perform(user)
    UserMailer.welcome_email(user).deliver_now
  end
end

user = User.first
WelcomeEmailJob.perform_later(user)

# Your code here

Need a hint?

This configuration makes Rails run jobs in the background using threads.