In Ruby on Rails (RoR), handling jobs asynchronously is often done using a background job processing system. One popular tool for this purpose is Sidekiq, which integrates seamlessly with Rails and uses Redis as a backend to manage the job queue. Below are the steps to set up a basic job handler using Sidekiq in a Rails application:

Add Sidekiq to your Gemfile:

Open your Gemfile and add the following line:

gem 'sidekiq'

Then run bundle install in your terminal to install the gem.

Configure Sidekiq:

Create a config/initializers/sidekiq.rb file and configure Sidekiq with Redis. For example:

# config/initializers/sidekiq.rb

Sidekiq.configure_server do |config|
  config.redis = { url: 'redis://localhost:6379/0' }
end

Sidekiq.configure_client do |config|
  config.redis = { url: 'redis://localhost:6379/0' }
end

Make sure to adjust the Redis URL based on your setup.

Create a background job:

Generate a new job using the following Rails command:

rails generate job ExampleJob

This will create a file in the app/jobs directory, typically named example_job.rb. Open this file and define the job:

# app/jobs/example_job.rb

class ExampleJob < ApplicationJob
  queue_as :default

  def perform(*args)
    # Your background job logic goes here
    puts "Example job performed with args: #{args.inspect}"
  end
end

Enqueue the job:

Wherever you want to enqueue this job (e.g., in a controller or another job), you can do so like this:

ExampleJob.perform_later(arg1, arg2)

Replace arg1, arg2, etc., with the actual arguments you want to pass to the job.

Run Sidekiq:

Start the Sidekiq process in your terminal:

bundle exec sidekiq

This will start processing background jobs.

Now, whenever you call perform_later on an instance of ExampleJob, Sidekiq will enqueue the job and execute it asynchronously.