N+1 queries can make an application slow. Having queries called within views can also slow down an app as well as making it less extendable.

Easily create PDF files within your Rails Application with Wicked PDF.

In this episode, we look at creating an iOS Application which will communicate with the Rails API application from the previous episode.

Using the URI or Accept Headers, we can version our API to prevent breaking changes to our end users. In this episode, we look at versioning our RESTful API.

The Observer pattern (also known as publish/subscribe) provides a simple mechanism for one object to inform a set of interested third-party objects when its state changes.