Ruby on Rails
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Latest commit b33555d Dec 27, 2013 @senny senny Merge pull request #13505 from robin850/patch-13
Ensure backward compatibility between Minitest 5 and 4
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actionmailer Improve font of some code in API documentation [ci skip] Dec 26, 2013
actionpack Improve font of some code in API documentation [ci skip] Dec 26, 2013
actionview Unused class in AV test Dec 25, 2013
activemodel Merge pull request #13483 from aditya-kapoor/add-missing-slashes Dec 27, 2013
activerecord Fix failure introduced from #13488 Dec 25, 2013
activesupport Use String#scrub when available to tidy bytes Dec 26, 2013
ci Add ActionView to CI Jun 20, 2013
guides Ensure backward compatibility between Minitest 5 and 4 Dec 27, 2013
railties rbconfig is not used in these files Dec 26, 2013
tasks Use annotated git tags for release task Dec 18, 2013
tools Removing Gem.source_index [ci skip] Jul 13, 2013
.gitignore Updated link to to GitHub article about ignoring files [ci skip] May 5, 2013
.travis.yml Test with 2.1.0 Dec 25, 2013
.yardopts Let YARD document the railties gem Sep 10, 2010 Add info about contributing to docs to Jun 6, 2013
Gemfile Only build a ConnectionSpecification if required Dec 24, 2013
RAILS_VERSION Get ready to release 4.1.0.beta1 Dec 18, 2013 Clarify that visiting http://localhost:3000 should be done in a browser. Oct 29, 2013
RELEASING_RAILS.rdoc Use annotated git tags for release task Dec 18, 2013
Rakefile Fix the install task Oct 23, 2013
install.rb actionview should be able to install using install.rb [ci skip] Jul 8, 2013
load_paths.rb require "rubygems" is obsolete in Ruby 1.9.3 May 13, 2012
rails.gemspec Added activemodel as a explicit dependency Oct 2, 2013
version.rb Its beta1 all around Dec 18, 2013

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 Model layer represents your domain model (such as Account, Product, Person, Post, etc.) 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 Active Model 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 load and manipulate models, and render view templates in order to generate the appropriate HTTP response. In Rails, incoming requests are routed by Action Dispatch to an appropriate controller, and controller classes are derived from ActionController::Base. Action Dispatch and Action Controller are bundled together in Action Pack. You can read more about Action Pack in its README.

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). Views are typically rendered to generate a controller response, or to generate the body of an email. In Rails, View generation is handled by Action View. You can read more about Action View in its README.

Active Record, Action Pack, and Action View can each be used independently outside Rails. In addition to them, Rails also comes with Action Mailer (README), a library to generate and send emails; and Active Support (README), a collection of utility classes and standard library extensions that are useful for Rails, and may also be used independently outside Rails.

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. Using a browser, go to http://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 Ruby on Rails guide for guidelines about how to proceed. Join us!

Code Status

  • Build Status
  • Dependencies


Ruby on Rails is released under the MIT License.