Everything you need to know to install Rails and create your first application.

This guide will get you started with models, persistence to database and the Active Record pattern and library.

This guide covers how you can use Active Record migrations to alter your database in a structured and organized manner.

This guide covers how you can use Active Record validations

This guide covers how you can use Active Record callbacks.

This guide covers all the associations provided by Active Record.

This guide covers the database query interface provided by Active Record.

This guide provides an introduction to Action View and introduces a few of the more common view helpers.

This guide covers the basic layout features of Action Controller and Action View, including rendering and redirecting, using content_for blocks, and working with partials.

Guide to using built-in Form helpers.

This guide covers how controllers work and how they fit into the request cycle in your application. It includes sessions, filters, and cookies, data streaming, and dealing with exceptions raised by a request, among other topics.

This guide covers the user-facing features of Rails routing. If you want to understand how to use routing in your own Rails applications, start here.

This guide documents the Ruby core extensions defined in Active Support.

This guide covers how to add internationalization to your applications. Your application will be able to translate content to different languages, change pluralization rules, use correct date formats for each country and so on.

This guide describes how to use Action Mailer to send and receive emails.

This is a rather comprehensive guide to doing both unit and functional tests in Rails. It covers everything from 'What is a test?' to the testing APIs. Enjoy.

This guide describes common security problems in web applications and how to avoid them with Rails.

This guide describes how to debug Rails applications. It covers the different ways of achieving this and how to understand what is happening "behind the scenes" of your code.

This guide covers the basic configuration settings for a Rails application.

This guide covers the command line tools and rake tasks provided by Rails.

Various caching techniques provided by Rails.

This guide documents the asset pipeline.

This guide covers the built-in Ajax/JavaScript functionality of Rails.

This guide explains how to write a mountable engine.

This guide explains the internals of the Rails initialization process as of Rails 3.1

This guide covers how to build a plugin to extend the functionality of Rails.

This guide covers Rails integration with Rack and interfacing with other Rack components.

This guide covers the process of adding a brand new generator to your extension or providing an alternative to an element of a built-in Rails generator (such as providing alternative test stubs for the scaffold generator).

Rails is not 'somebody else's framework.' This guide covers a variety of ways that you can get involved in the ongoing development of Rails.

This guide documents the Ruby on Rails API documentation guidelines.

This guide documents the Ruby on Rails guides guidelines.

What versions of Ruby on Rails are currently supported, and when to expect new versions.

This guide helps in upgrading applications to latest Ruby on Rails versions.

Release notes for Rails 4.0.

Release notes for Rails 3.2.

Release notes for Rails 3.1.

Release notes for Rails 3.0.

Release notes for Rails 2.3.

Release notes for Rails 2.2.