Jbuilder provides a DSL for generating JSON. It includes a template engine which allows you to create complex responses with helpers and conditions.

With HTTP response headers you can the cache in the user's browser and proxies. Etags, Last-Modified, Cache-Control and Rack::Cache are all covered here

Rails metal may have been removed in Rails 3, but it is possible to bypass the entire Rails stack through middleware as shown in this episode.

Rails 3.2 sports many new features including automatic explain queries, tagged logging, key-value store in Active Record, improved migration generator and more. Learn all about these new features in this episode.

Here I describe each Rack middleware that is included in a Rails app which will give you a better understanding of what a request goes through behind the scenes before it hits your application.

Rails comes with three environments: development, test, and production, but it is easy to add your own. Here I show how to add a separate staging environment and how to start up Rails under this.

When was the last time JavaScript's "this" worked the way you thought it did? You have an object with a function, and you call "this" to get some data from the it only to find that the data isn't there because "this" isn't the object you thought it was! In this episode, we'll look at all function invocations and how they manipulate "this". We'll also see some common scenarios that trip people up, like passing an object's method as a callback.

Private Pub makes it easier than ever to publish and subscribe to real-time events in a Rails app. You can use publish_to with a block of JavaScript or supply a hash for use with JSON.

Rack comes with many helpful utilities such as request and response objects, various middleware, and MockRequest for testing. Here I cover all of these while building a Rack app from scratch.