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Ruby on Rails · Module 9 of 10

Background jobs, mail and caching

Do slow work outside the request and speed pages up.

📖 Key ideas

  1. Active Job runs work in the background (Solid Queue or Sidekiq).
  2. Action Mailer sends emails; deliver_later uses a job.
  3. Cache fragments with <% cache product do %>.
  4. Rails.cache stores computed values (Solid Cache, Redis, Memcached).
  5. Action Cable adds WebSockets for live updates.
💡 Real-life example: Like a restaurant: the waiter takes your order quickly, and the kitchen cooks in the background while you wait at the table.
Active JobBackground job framework
Action MailerSends emails
deliver_laterSend an email through a job
Fragment cacheCached part of a page