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John Hawthorn 51e28dc322 Remove child event tracking from AS::Subscriber
Previously ActiveSupport::Subscriber would manage its own events, keep
them in a thread-local stack, and track "child" events of the same
subscriber.

I don't think this was particularly useful, since it only considered
notifications delivered to the same subscriber, and I can't find
evidence of this being used in the wild. I think this was intended to
support tracing, but any uch tool would want to do this itself (at
minimum in order to support multiple namespaces).

Additionally, this has caused a few users to OOM in production
environments, notably when queueing many jobs from another job.
2022-02-17 08:20:01 -08:00
.devcontainer Fix typos in the script 2021-11-15 22:18:36 +00:00
.github Update stale issue comment to mention 7-0-stable 2022-01-02 00:42:38 +00:00
actioncable Only close websockets when connection is open (#44304) 2022-02-02 15:50:34 +01:00
actionmailbox Temporarily add net-gems as dependencies of frameworks that use mail 2022-01-05 17:42:40 +00:00
actionmailer document usage of :enable_starttls 2022-01-06 17:41:00 +02:00
actionpack Fix setting trailing_slash: true in route definition 2022-02-15 10:44:33 +01:00
actiontext Don't render layout in ActionText::Content#inspect 2022-02-01 11:58:12 -06:00
actionview Merge pull request #44093 from motine/doc-hint-for-fields_for 2022-02-09 20:17:01 -05:00
activejob Add missing requires 2022-02-17 11:13:51 +10:30
activemodel Update ActiveModel::Attributes examples in docs 2022-02-11 01:19:49 +05:00
activerecord Add missing requires 2022-02-17 11:13:51 +10:30
activestorage Revert #38957 (#44287) 2022-01-29 14:27:45 +01:00
activesupport Remove child event tracking from AS::Subscriber 2022-02-17 08:20:01 -08:00
ci ✂️ 2021-10-14 16:36:56 +00:00
guides Merge pull request #44441 from jonathanhefner/guide-encryption-config-table-to-sections 2022-02-16 15:58:08 -06:00
railties Merge pull request #44309 from nholden/fix-destroy-async-config 2022-02-16 14:55:24 -08:00
tasks Add support for YubiKey OTP codes during release 2021-12-14 12:48:01 -08:00
tools Replace webpack with importmapped Hotwire as default js (#42999) 2021-08-26 10:39:36 +02:00
.gitattributes adds .gitattributes to enable Ruby-awareness 2016-03-16 11:15:22 +01:00
.gitignore Depend on ruby/debug, replacing Byebug 2021-09-08 17:35:41 +02:00
.rubocop.yml Enable Lint/EnsureReturn cop 2022-02-05 23:58:07 +00:00
.yardopts Updating .yardopts to document .rb files in [GEM]/app 2019-08-20 13:25:36 -04:00
.yarnrc Make Webpacker the default JavaScript compiler for Rails 6 (#33079) 2018-09-30 22:31:21 -07:00
Brewfile Address Error: caskroom/cask was moved. Tap homebrew/cask-cask instead. 2019-12-18 18:50:57 +09:00
CODE_OF_CONDUCT.md Update CODE_OF_CONDUCT.md 2022-01-18 11:22:46 -05:00
codespell.txt Fix misspelling of value is tests 2022-02-15 14:50:33 +01:00
CONTRIBUTING.md Fix 404 links on https://rubyonrails.org/ [ci-skip] 2021-12-17 02:26:34 +09:00
Gemfile Upgrade to sdoc 2.3.1 2022-02-14 19:36:22 +01:00
Gemfile.lock Upgrade to sdoc 2.3.1 2022-02-14 19:36:22 +01:00
MIT-LICENSE Bump license years to 2022 [ci-skip] 2022-01-01 15:22:15 +09:00
package.json Install JavaScript packages before run test 2019-02-11 09:58:08 +09:00
rails.gemspec Fix gemspec 2021-11-15 21:06:21 +00:00
RAILS_VERSION Start Rails 7.1 development 2021-12-07 15:52:30 +00:00
Rakefile Use frozen string literal in root files 2017-08-13 22:14:24 +09:00
README.md Convert lib and frameworks to bulleted list-README 2022-02-14 23:15:16 +05:30
RELEASING_RAILS.md Update URLs for the blog [ci-skip] 2021-12-17 11:02:05 +01:00
version.rb Start Rails 7.1 development 2021-12-07 15:52:30 +00:00
yarn.lock [ci skip] Added a note about Github Codespaces' warning (#44148) 2022-01-21 09:08:50 -05:00

Welcome to Rails

What's 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: Model, View, and Controller, each with a specific responsibility.

Model layer

The Model layer represents the domain model (such as Account, Product, Person, Post, etc.) and encapsulates the business logic 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.

View layer

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.

Controller layer

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.

Frameworks and libraries

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, a library to generate and send emails
  • Action Mailbox, a library to receive emails within a Rails application
  • Active Job, a framework for declaring jobs and making them run on a variety of queuing backends
  • Action Cable, a framework to integrate WebSockets with a Rails application
  • Active Storage, a library to attach cloud and local files to Rails applications
  • Action Text, a library to handle rich text content
  • Active Support, 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
     $ bin/rails server
    

    Run with --help or -h for options.

  4. Go to http://localhost:3000 and you'll see the Rails bootscreen with your Rails and Ruby versions.

  5. Follow the guidelines to start developing your application. You may find the following resources handy:

Contributing

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!

Trying to report a possible security vulnerability in Rails? Please check out our security policy for guidelines about how to proceed.

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.

License

Ruby on Rails is released under the MIT License.