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Pull request Compare This branch is 19992 commits behind rails:master.
sgrif Fix bind value copying from subqueried relations
With the old implementation, the bind values were created, and then we
search the attributes for `Relation` objects, and merge them. This
completely ignores the order that the actual `where` clause will use. If
all non-relation where parameters are before the relations, it will
work. However, if we query on both a relation and a value, with the
value coming second, it breaks. The order of the hash should not affect
the final query (especially since hashes being ordered is an
implementation detail)
Latest commit 04d1c37 Jan 19, 2015
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actionmailer Merge pull request #18521 from andrewvida/master Jan 14, 2015
actionpack Merge pull request #18483 from rono23/fix-name_for_action-in-routing Jan 19, 2015
actionview fix typo in number_field_tag documentation [ci skip] Jan 19, 2015
activejob formatting pass over CHANGELOGs. [ci skip] Jan 10, 2015
activemodel Don't calculate in-place changes on attribute assignment Jan 18, 2015
activerecord Fix bind value copying from subqueried relations Jan 19, 2015
activesupport Merge pull request #18450 from tonytonyjan/patch-1 Jan 19, 2015
ci Pass symbol as an argument instead of a block Nov 29, 2014
guides Use force: true options for creating tables in bug templates Jan 19, 2015
railties Merge pull request #18380 from nobu/Use-EXEEXT Jan 19, 2015
tasks activejob needs to be built before actionmailer Dec 20, 2014
tools minor docs change [ci skip] Nov 3, 2014
.gitignore Updated link to to GitHub article about ignoring files [ci skip] May 5, 2013
.travis.yml Use bundler 1.7 on travis Jan 18, 2015
.yardopts Let YARD document the railties gem Sep 10, 2010 Changed "in GitHub" to "on GitHub" [ci skip] Jan 14, 2015
Gemfile Include stackprof on ruby 2.2 as well as 2.1 Jan 18, 2015
RAILS_VERSION Start Rails 5 development 🎉 Nov 28, 2014 Remove bullet Dec 21, 2014
RELEASING_RAILS.rdoc Remove note about supported plugins from the releasing docs Jan 10, 2015
Rakefile Remove activejob integration tests Aug 12, 2014
install.rb Added activejob to install.rb Aug 12, 2014
load_paths.rb require "rubygems" is obsolete in Ruby 1.9.3 May 13, 2012
rails.gemspec targeting 2.2 Dec 26, 2014
version.rb Start Rails 5 development 🎉 Nov 28, 2014

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, 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; Active Job (README), a framework for declaring jobs and making them run on a variety of queueing backends; 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


Ruby on Rails is released under the MIT License.