Caching is a great way to speed up your applications. However, when a cache becomes stale, there could be a user experience degradation until the cache is rebuilt. In this episode, we look at implementing a background job to rebuild the cache.

In this episode, we continue the Trello clone by adding a collaborator invitation mechanism to join working on lists. We look at some tricky ActiveRecord relationships and various solutions.

Heroku is a Platform as a Service (PaaS), where you can deploy and manage your Ruby on Rails applications. It is one of the easiest platforms to deploy to; allowing you to focus on the development side of things instead of worrying about managing an infrastructure.

The Mechanize library is used for automating interaction with websites. Mechanize automatically stores and sends cookies, follows redirects, and can follow links and submit forms. Form fields can be populated and submitted.

In this episode, we look at creating a Ruby on Rails application with OmniAuth as the authentication solution and write tests to ensure that it works properly.