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Getting Started with Rails

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Active Record Basics

This guide will get you started with models, persistence to database, and the Active Record pattern and library.

Active Record Migrations

This guide covers how you can use Active Record migrations to alter your database in a structured and organized manner.

Active Record Validations

This guide covers how you can use Active Record validations.

Active Record Callbacks

This guide covers how you can use Active Record callbacks.

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This guide covers all the associations provided by Active Record.

Active Record Query Interface

This guide covers the database query interface provided by Active Record.

Active Model Basics

Work in progress

This guide covers the use of model classes without Active Record.

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Action View Overview

Work in progress

This guide provides an introduction to Action View.

Layouts and Rendering in Rails

This guide covers the basic layout features of Action Controller and Action View, including rendering and redirecting, using content_for blocks, and working with partials.

Action View Helpers

Work in progress

This guide introduces a few of the more common view helpers.

Action View Form Helpers

Guide to using built-in Form helpers.

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Action Controller Overview

This guide covers how controllers work and how they fit into the request cycle in your application. It includes sessions, filters, and cookies, data streaming, and dealing with exceptions raised by a request, among other topics.

Rails Routing from the Outside In

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Active Support Core Extensions

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Action Mailer Basics

This guide describes how to use Action Mailer to send emails.

Action Mailbox Basics

Work in progress

This guide describes how to use Action Mailbox to receive emails.

Action Text Overview

Work in progress

This guide describes how to use Action Text to handle rich text content.

Active Job Basics

This guide provides you with all you need to get started creating, enqueuing, and executing background jobs.

Active Storage Overview

This guide covers how to attach files to your Active Record models.

Action Cable Overview

This guide explains how Action Cable works, and how to use WebSockets to create real-time features.

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Rails Internationalization (I18n) API

This guide covers how to add internationalization to your applications. Your application will be able to translate content to different languages, change pluralization rules, use correct date formats for each country, and so on.

Testing Rails Applications

This is a rather comprehensive guide to the various testing facilities in Rails. It covers everything from 'What is a test?' to Integration Testing. Enjoy.

Securing Rails Applications

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Debugging Rails Applications

This guide describes how to debug Rails applications. It covers the different ways of achieving this and how to understand what is happening "behind the scenes" of your code.

Configuring Rails Applications

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The Rails Command Line

This guide covers the command line tools provided by Rails.

The Asset Pipeline

This guide documents the asset pipeline.

Working with JavaScript in Rails

Work in progress

This guide covers the built-in Ajax/JavaScript functionality of Rails.

The Rails Initialization Process

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This guide explains the internals of the Rails initialization process.

Autoloading and Reloading Constants (Zeitwerk Mode)

This guide documents how autoloading and reloading constants work (Zeitwerk mode).

Autoloading and Reloading Constants (Classic Mode)

This guide documents how autoloading and reloading constants work (Classic mode).

Caching with Rails: An Overview

This guide is an introduction to speeding up your Rails application with caching.

Active Support Instrumentation

Work in progress

This guide explains how to use the instrumentation API inside of Active Support to measure events inside of Rails and other Ruby code.

Using Rails for API-only Applications

This guide explains how to effectively use Rails to develop a JSON API application.

Active Record and PostgreSQL

Work in progress

This guide covers PostgreSQL specific usage of Active Record.

Multiple Databases with Active Record

Work in progress

This guide covers using multiple databases in your application.

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The Basics of Creating Rails Plugins

Work in progress

This guide covers how to build a plugin to extend the functionality of Rails.

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This guide covers Rails integration with Rack and interfacing with other Rack components.

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This guide covers the process of adding a brand new generator to your extension or providing an alternative to an element of a built-in Rails generator (such as providing alternative test stubs for the scaffold generator).

Getting Started with Engines

Work in progress

This guide explains how to write a mountable engine.

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This guide describes the considerations needed and tools available when working directly with concurrency in a Rails application.

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Contributing to Ruby on Rails

Rails is not "someone else's framework". This guide covers a variety of ways that you can get involved in the ongoing development of Rails.

API Documentation Guidelines

This guide documents the Ruby on Rails API documentation guidelines.

Guides Guidelines

This guide documents the Ruby on Rails guides guidelines.

Policies

Maintenance Policy

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Release Notes

Upgrading Ruby on Rails

This guide helps in upgrading applications to latest Ruby on Rails versions.

Version 6.1 - May 2020

Work in progress

Release notes for Rails 6.1.

Version 6.0 - August 2019

Release notes for Rails 6.0.

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Release notes for Rails 5.2.

Version 5.1 - April 2017

Release notes for Rails 5.1.

Version 5.0 - June 2016

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Version 4.2 - December 2014

Release notes for Rails 4.2.

Version 4.1 - April 2014

Release notes for Rails 4.1.

Version 4.0 - June 2013

Release notes for Rails 4.0.

Version 3.2 - January 2012

Release notes for Rails 3.2.

Version 3.1 - August 2011

Release notes for Rails 3.1.

Version 3.0 - August 2010

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Version 2.3 - March 2009

Release notes for Rails 2.3.

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Feedback

You're encouraged to help improve the quality of this guide.

Please contribute if you see any typos or factual errors. To get started, you can read our documentation contributions section.

You may also find incomplete content or stuff that is not up to date. Please do add any missing documentation for master. Make sure to check Edge Guides first to verify if the issues are already fixed or not on the master branch. Check the Ruby on Rails Guides Guidelines for style and conventions.

If for whatever reason you spot something to fix but cannot patch it yourself, please open an issue.

And last but not least, any kind of discussion regarding Ruby on Rails documentation is very welcome on the rubyonrails-docs mailing list.