Ruby on Rails
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actionmailer Send paths argument as an array rather than converting it internally Jan 29, 2013
actionpack the `:controller` option for routes can contain numbers. closes #9231. Feb 9, 2013
activemodel Take care of whitespaces and changing the hash syntax Feb 4, 2013
activerecord Update activerecord/ Feb 9, 2013
activesupport Update changelog from #9128 with author name Feb 6, 2013
ci remove duplicate build runs in travis. These extra runs were used to Jul 24, 2012
guides Prefer Ruby 2.0; require 1.9.3+ Feb 10, 2013
railties Prefer Ruby 2.0; require 1.9.3+ Feb 10, 2013
tasks Remove Active Resource source files from the repository Mar 13, 2012
tools Remove REE GC stats since master is 1.9.3 Oct 26, 2012
.gitignore Update .gitignore Feb 5, 2013
.travis.yml All green with Ruby 2.0 💚 Jan 11, 2013
.yardopts Let YARD document the railties gem Sep 10, 2010 add some kindness Sep 18, 2012
Gemfile Depend on thor >= 0.17.0 Jan 24, 2013
RAILS_VERSION rails/master is now 4.0.0.beta and will only support Ruby 1.9.3+ Dec 20, 2011
README.rdoc adding comma to separate clauses Jan 21, 2013
RELEASING_RAILS.rdoc Added extra note about when to email other rubies to RELEASING_RAILS.… Feb 1, 2013
Rakefile Pass in `--local` when doing `gem install` for local gems. Jan 3, 2013
install.rb Adding a usage message to install.rb script Jan 3, 2013
load_paths.rb require "rubygems" is obsolete in Ruby 1.9.3 May 13, 2012
rails.gemspec Relax bundler dep until 1.3.0 is actually released. Jan 10, 2013
version.rb rails/master is now 4.0.0.beta and will only support Ruby 1.9.3+ Dec 20, 2011


Welcome to Rails

Rails is a web-application framework that includes everything needed to create database-backed web applications according to the Model-View-Controller (MVC) pattern.

Understanding the MVC pattern is key to understanding Rails. MVC divides your application into three layers, each with a specific responsibility.

The View layer is composed of “templates” that are responsible for providing appropriate representations of your application's resources. Templates can come in a variety of formats, but most view templates are HTML with embedded Ruby code (.erb files).

The Model layer represents your domain model (such as Account, Product, Person, Post) and encapsulates the business logic that is specific to your application. In Rails, database-backed model classes are derived from ActiveRecord::Base. Active Record allows you to present the data from database rows as objects and embellish these data objects with business logic methods. Although most Rails models are backed by a database, models can also be ordinary Ruby classes, or Ruby classes that implement a set of interfaces as provided by the ActiveModel module. You can read more about Active Record in its README.

The Controller layer is responsible for handling incoming HTTP requests and providing a suitable response. Usually this means returning HTML, but Rails controllers can also generate XML, JSON, PDFs, mobile-specific views, and more. Controllers manipulate models and render view templates in order to generate the appropriate HTTP response.

In Rails, the Controller and View layers are handled together by Action Pack. These two layers are bundled in a single package due to their heavy interdependence. This is unlike the relationship between Active Record and Action Pack, which are independent. Each of these packages can be used independently outside of Rails. You can read more about Action Pack in its README.

Getting Started

  1. Install Rails at the command prompt if you haven't yet:

    gem install rails
  2. At the command prompt, create a new Rails application:

    rails new myapp

    where “myapp” is the application name.

  3. Change directory to myapp and start the web server:

    cd myapp; rails server

    Run with --help or -h for options.

  4. Go to localhost:3000 and you'll see:

    "Welcome aboard: You're riding Ruby on Rails!"
  5. Follow the guidelines to start developing your application. You may find the following resources handy:


We encourage you to contribute to Ruby on Rails! Please check out the Contributing to Rails guide for guidelines about how to proceed. Join us!

Code Status


Ruby on Rails is released under the MIT License.