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Ruby on Rails

branch: 3-1-stable

This branch is 1758 commits ahead and 20422 commits behind master

Use the reference for the mime type to get the format

Before we were calling to_sym in the mime type, even when it is unknown
what can cause denial of service since symbols are not removed by the
garbage collector.

Fixes: CVE-2014-0082
latest commit 06cbb8a132
Rafael Mendonça França rafaelfranca authored February 11, 2014
Octocat-spinner-32 actionmailer bumping to 3.1.12 March 18, 2013
Octocat-spinner-32 actionpack Use the reference for the mime type to get the format February 18, 2014
Octocat-spinner-32 activemodel bumping to 3.1.12 March 18, 2013
Octocat-spinner-32 activerecord Merge branch '3-1-later' into 3-1-stable April 09, 2013
Octocat-spinner-32 activeresource bumping to 3.1.12 March 18, 2013
Octocat-spinner-32 activesupport Add in missing requires March 18, 2013
Octocat-spinner-32 bin Add railties to the LOAD_PATH if running from a Rails checkout April 03, 2011
Octocat-spinner-32 ci Remove cruise files August 13, 2011
Octocat-spinner-32 railties Add in missing requires March 18, 2013
Octocat-spinner-32 tasks
Octocat-spinner-32 tools Support an extra profile printer arg June 24, 2010
Octocat-spinner-32 .gitignore allow people to set a local .Gemfile so that things like ruby-debug a… November 18, 2011
Octocat-spinner-32 .travis.yml Don't notify campfire when the build keeps passing December 19, 2011
Octocat-spinner-32 .yardopts Let YARD document the railties gem September 09, 2010
Octocat-spinner-32 Gemfile Update mocha version to 0.13.0 and change requires January 16, 2013
Octocat-spinner-32 RAILS_VERSION bumping to 3.1.12 March 18, 2013
Octocat-spinner-32 README.rdoc doc fixes September 01, 2011
Octocat-spinner-32 Rakefile CHANGELOG to November 09, 2011
Octocat-spinner-32 install.rb Add install script for testing gems locally July 26, 2010
Octocat-spinner-32 load_paths.rb This fixes an issue when bundling to a local path (eg. /vendor/bundle). July 17, 2011
Octocat-spinner-32 rails.gemspec Revert "The rails gem doesn't have a lib directory." July 04, 2011
Octocat-spinner-32 version.rb bumping to 3.1.12 March 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 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.

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