Skip to content
Ruby on Rails
Ruby HTML CSS CoffeeScript E JavaScript
Find file
Pull request Compare This branch is 1760 commits ahead, 33700 commits behind master.
Latest commit 4dacedf @tenderlove tenderlove correctly escape backslashes in request path globs

make sure that unreadable files are also not leaked


Failed to load latest commit information.
actionmailer bumping to 3.1.12
actionpack correctly escape backslashes in request path globs
activemodel bumping to 3.1.12
activerecord Merge branch '3-1-later' into 3-1-stable
activeresource bumping to 3.1.12
activesupport Add in missing requires
bin Add railties to the LOAD_PATH if running from a Rails checkout
ci Remove cruise files
railties Add in missing requires
tasks rake release should push the tag
tools Support an extra profile printer arg
.gitignore allow people to set a local .Gemfile so that things like ruby-debug a…
.travis.yml Don't notify campfire when the build keeps passing
.yardopts Let YARD document the railties gem
RAILS_VERSION bumping to 3.1.12
README.rdoc doc fixes
Rakefile CHANGELOG to
install.rb Add install script for testing gems locally
load_paths.rb This fixes an issue when bundling to a local path (eg. /vendor/bundle).
rails.gemspec Revert "The rails gem doesn't have a lib directory."
version.rb bumping to 3.1.12


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 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!


Ruby on Rails is released under the MIT license.

Something went wrong with that request. Please try again.