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Jonathan Hefner a197d39e13
Fall back to video container for duration
Some video formats, such as WebM, do not store duration information at
the level of the video stream.  Instead, the duration is stored as part
of the container format information.

This commit modifies `VideoAnalyzer` to use the duration from the video
container when the duration from the video stream is not available.

Fixes #40130.
2020-08-31 08:48:06 -04:00
.github Merge pull request #39420 from jonathanhefner/verba-sequentur-config 2020-08-26 13:47:22 -04:00
actioncable Merge pull request #39123 from tannakartikey/actioncable_logger_docs 2020-07-06 14:28:43 -04:00
actionmailbox Sendgrid: prepend X-Original-To header with envelope recipients 2020-07-21 19:38:38 -04:00
actionmailer Deprecate custom Action Mailer delivery job: 2020-08-26 17:48:47 +02:00
actionpack Merge pull request #40112 from eliotsykes/patch-1 2020-08-30 03:16:59 +05:30
actiontext Remove white list word 2020-06-09 13:41:51 -04:00
actionview Remove unecessary method call 2020-08-26 20:46:33 +00:00
activejob fix typo in Active Job exceptions docs 2020-07-18 11:05:35 +01:00
activemodel Documents other_than option also accepts the proc or a symbol for numericality validation [skip ci] 2020-08-24 21:27:45 +05:30
activerecord Merge pull request #40106 from kamipo/where_references_association_name 2020-08-31 11:46:30 +09:00
activestorage Fall back to video container for duration 2020-08-31 08:48:06 -04:00
activesupport Merge pull request #39350 from jaynetics/fix_rounding_of_custom_formatted_negative_amounts 2020-08-26 16:08:55 -04:00
ci Remove .travis.yml and ci/travis.rb 2020-01-02 09:27:53 +09:00
guides Merge pull request #40088 from KapilSachdev/fix/add_link_in_contributing_guide 2020-08-30 03:19:31 +05:30
railties Merge pull request #40143 from jonathanhefner/load-rails-rake-tasks-once 2020-08-30 22:28:37 +01:00
tasks
tools Introduce Rails::TestUnitReporter.app_root to inject app_root when needed. 2020-06-14 00:02:49 +02:00
.gitattributes
.gitignore
.rubocop.yml Remove redundant Exclude in .rubocop.yml 2020-06-29 16:06:48 -07:00
.yardopts
.yarnrc
Brewfile
CODE_OF_CONDUCT.md
CONTRIBUTING.md Update the Rails mailing list URLs to new discuss discourse URL [ci skip] 2020-04-02 22:00:28 +05:30
Gemfile Use Rouge for guides code highlighting [ci skip] 2020-07-08 09:05:08 +02:00
Gemfile.lock Update Gemfile.lock 2020-08-18 18:14:00 +09:00
MIT-LICENSE Bump license years from 2019 to 2020 [ci skip] 2020-01-01 15:10:31 +05:30
package.json
rails.gemspec Update outdated bundler in gemspec 2020-08-18 00:39:54 +08:00
RAILS_VERSION
Rakefile
README.md remove reference to global rails command and replace with bin/rails 2019-12-27 19:32:37 +00:00
RELEASING_RAILS.md fix: Update Agile Web Development with Rails book link [ci skip] 2020-08-13 10:36:46 +05:30
version.rb
yarn.lock Upgrade kind-of 2020-04-19 23:59:27 -03:00

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.

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.

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.

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; and 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: "Yay! Youre on Rails!"

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

Contributing

Code Triage Badge

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.

Code Status

Build Status

License

Ruby on Rails is released under the MIT License.