Ruby on Rails
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Latest commit 8ce903a Dec 2, 2016 @guilleiguaran guilleiguaran committed on GitHub Merge pull request #27250 from y-yagi/use_binstub_in_bin_update
use yarn binstub in `bin/update`
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.github Add a note about adding CHANGELOG entries at the top of the file [ci … Jul 2, 2016
actioncable Prevent race condition when launching EventMachine reactor Nov 30, 2016
actionmailer update bin/test scripts to prevent double runs. Nov 21, 2016
actionpack use `Gem.win_platform?` to check windows Ruby platforms Nov 30, 2016
actionview use `Gem.win_platform?` to check windows Ruby platforms Nov 30, 2016
activejob Avoid race condition in AJ integration tests Nov 30, 2016
activemodel Allow indifferent access in ActiveModel::Errors Nov 21, 2016
activerecord Stop using the `pg` Float encoder Dec 1, 2016
activesupport Exclude singleton classes from `subclasses` and `descendants` Dec 1, 2016
ci Add more rubocop rules about whitespaces Oct 29, 2016
guides Fixes #27202, [ci skip] Nov 30, 2016
railties use yarn binstub in `bin/update` Dec 2, 2016
tasks modernizes hash syntax in the rest of the project Aug 6, 2016
tools update bin/test scripts to prevent double runs. Nov 21, 2016
.codeclimate.yml Generators and tests are under the same style rules Jul 27, 2016
.gitattributes adds .gitattributes to enable Ruby-awareness Mar 16, 2016
.gitignore .gitignore: Ignore .ruby-version in any subdir Sep 7, 2015
.rubocop.yml Add more rubocop rules about whitespaces Oct 29, 2016
.travis.yml Only start rabbitmq when we need it Nov 27, 2016
.yardopts Let YARD document the railties gem Sep 10, 2010 Move the CoC text to the Rails website Aug 21, 2015 Add notes on cosmetic patches May 13, 2016
Gemfile rails-ujs is now shipped with Action View Nov 29, 2016
Gemfile.lock rails-ujs is now shipped with Action View Nov 29, 2016
MIT-LICENSE Rename `LICENSE` to `MIT-LICENSE` for consistency with sub projects Sep 23, 2016
RAILS_VERSION Start Rails 5.1 development 🎉 May 10, 2016 Fix title of README according to Markdown conventions Feb 25, 2016 Update for rails-ujs Nov 26, 2016
Rakefile Remove Faye mode Oct 1, 2016
rails.gemspec applies new string literal convention in the gemspecs Aug 6, 2016
version.rb Start Rails 5.1 development 🎉 May 10, 2016

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. You can read more about Active Record in its README. 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 Model 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, Active Model, Action Pack, and Action View can each be used independently outside Rails. In addition to that, Rails also comes with Action Mailer (README), a library to generate and send emails; Active Job (README), a framework for declaring jobs and making them run on a variety of queueing backends; Action Cable (README), a framework to integrate WebSockets with a Rails application; 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: "Yay! You’re 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!

Everyone interacting in Rails and its sub-projects' codebases, issue trackers, chat rooms, and mailing lists is expected to follow the Rails code of conduct.

Code Status

Build Status


Ruby on Rails is released under the MIT License.