rails deliver_later with delay

Step 1: Add the "delayed_job" gem to your Gemfile and run the bundle command to install it.

Step 2: Create a new instance of the class where you want to use the deliver_later method. For example, if you want to use it in the UserMailer class, create a new file called user_mailer.rb in the app/mailers directory.

Step 3: In the user_mailer.rb file, define a method for the email you want to send. For example, if you want to send a welcome email to new users, define a method called welcome_email(user).

Step 4: Inside the method, use the deliver_later method to enqueue the email to be sent later. For example, you can use UserMailer.welcome_email(user).deliver_later.

Step 5: Save the changes and restart your Rails server if it was running.

Step 6: When the email needs to be sent, the deliver_later method will use the Delayed::Job backend to process the email in the background. This allows your application to continue running without waiting for the email to be sent.

Step 7: The Delayed::Job backend will automatically pick up the enqueued email and send it when it's ready. You don't need to do anything else to trigger the sending of the email.

Step 8: If you want to customize the delay time, you can pass an optional delay argument to the deliver_later method. For example, you can use UserMailer.welcome_email(user).deliver_later(delay: 1.hour) to delay the email for 1 hour.

Step 9: You can also chain multiple deliver_later calls to enqueue multiple emails in one go. For example, you can use UserMailer.welcome_email(user).deliver_later.deliver_later to enqueue two emails to be sent later.

Step 10: Monitor the Delayed::Job queue to ensure that the enqueued emails are being processed and sent. You can use tools like the delayed_job_web gem or the Rails console to check the status of the jobs.

That's it! You have successfully used deliver_later with delay in Ruby on Rails. This allows you to send emails in the background, improving the performance of your application.