Active Storage Overview — Ruby on Rails Guides
This guide covers how to attach files to your Active Record models. After reading this guide, you will know: How to attach one or many files to a record. How to delete an attached file. How to link to an attached file. How to use variants to transform images. How to generate an image representation of a non-image file, such as a PDF or a video. How to send file uploads directly from browsers to a
Ruby on Rails 5.2 Release Notes — Ruby on Rails Guides
Highlights in Rails 5.2: Active Storage Redis Cache Store HTTP/2 Early Hints Credentials Content Security Policy These release notes cover only the major changes. To learn about various bug fixes and changes, please refer to the changelogs or check out the list of commits in the main Rails repository on GitHub. 1 Upgrading to Rails 5.2If you're upgrading an existing application, it's a great idea
Using Rails for API-only Applications — Ruby on Rails Guides
In this guide you will learn: What Rails provides for API-only applications How to configure Rails to start without any browser features How to decide which middleware you will want to include How to decide which modules to use in your controller 1 What is an API Application?Traditionally, when people said that they used Rails as an "API", they meant providing a programmatically accessible API alo
Using Rails for API-only Applications — Ruby on Rails Guides
In this guide you will learn: What Rails provides for API-only applications How to configure Rails to start without any browser features How to decide which middleware you will want to include How to decide which modules to use in your controller 1 What is an API Application?Traditionally, when people said that they used Rails as an "API", they meant providing a programmatically accessible API alo
Getting Started with Engines — Ruby on Rails Guides
In this guide you will learn about engines and how they can be used to provide additional functionality to their host applications through a clean and very easy-to-use interface. After reading this guide, you will know: What makes an engine. How to generate an engine. How to build features for the engine. How to hook the engine into an application. How to override engine functionality in the appli
Ruby on Rails 5.1 Release Notes — Ruby on Rails Guides
Highlights in Rails 5.1: Yarn Support Optional Webpack support jQuery no longer a default dependency System tests Encrypted secrets Parameterized mailers Direct & resolved routes Unification of form_for and form_tag into form_with These release notes cover only the major changes. To learn about various bug fixes and changes, please refer to the changelogs or check out the list of commits in the ma
Ruby on Rails Guides: The Basics of Creating Rails Plugins
A Rails plugin is either an extension or a modification of the core framework. Plugins provide: a way for developers to share bleeding-edge ideas without hurting the stable code base a segmented architecture so that units of code can be fixed or updated on their own release schedule an outlet for the core developers so that they don’t have to include every cool new feature under the sun After read
Ruby on Rails 4.1 Release Notes — Ruby on Rails Guides
Highlights in Rails 4.1: Spring application preloader config/secrets.yml Action Pack variants Action Mailer previews These release notes cover only the major changes. To learn about various bug fixes and changes, please refer to the changelogs or check out the list of commits in the main Rails repository on GitHub. 1 Upgrading to Rails 4.1If you're upgrading an existing application, it's a great i
Upgrading Ruby on Rails — Ruby on Rails Guides
This guide provides steps to be followed when you upgrade your applications to a newer version of Ruby on Rails. These steps are also available in individual release guides. 1 General AdviceBefore attempting to upgrade an existing application, you should be sure you have a good reason to upgrade. You need to balance several factors: the need for new features, the increasing difficulty of finding s
Ruby on Rails 5.0 Release Notes — Ruby on Rails Guides
Highlights in Rails 5.0: Action Cable Rails API Active Record Attributes API Test Runner Exclusive use of rails CLI over Rake Sprockets 3 Turbolinks 5 Ruby 2.2.2+ required These release notes cover only the major changes. To learn about various bug fixes and changes, please refer to the changelogs or check out the list of commits in the main Rails repository on GitHub. 1 Upgrading to Rails 5.0If y
A Guide for Upgrading Ruby on Rails — Ruby on Rails Guides
This guide provides steps to be followed when you upgrade your applications to a newer version of Ruby on Rails. These steps are also available in individual release guides. 1 General AdviceBefore attempting to upgrade an existing application, you should be sure you have a good reason to upgrade. You need to balance several factors: the need for new features, the increasing difficulty of finding s
Active Support Instrumentation — Ruby on Rails Guides
Active Support is a part of core Rails that provides Ruby language extensions, utilities, and other things. One of the things it includes is an instrumentation API that can be used inside an application to measure certain actions that occur within Ruby code, such as those inside a Rails application or the framework itself. It is not limited to Rails, however. It can be used independently in other
Ruby on Rails Guides: Migrations
Migrations are a convenient way for you to alter your database in a structured and organized manner. You could edit fragments of SQL by hand but you would then be responsible for telling other developers that they need to go and run them. You’d also have to keep track of which changes need to be run against the production machines next time you deploy. Active Record tracks which migrations have al
Rails on Rack — Ruby on Rails Guides
This guide covers Rails integration with Rack and interfacing with other Rack components. After reading this guide, you will know: How to use Rack Middlewares in your Rails applications. Action Pack's internal Middleware stack. How to define a custom Middleware stack. This guide assumes a working knowledge of Rack protocol and Rack concepts such as middlewares, URL maps, and Rack::Builder. 1 Intro
Caching with Rails: An Overview — Ruby on Rails Guides
This guide is an introduction to speeding up your Rails application with caching. Caching means to store content generated during the request-response cycle and to reuse it when responding to similar requests. Caching is often the most effective way to boost an application's performance. Through caching, websites running on a single server with a single database can sustain a load of thousands of
Contributing to Ruby on Rails — Ruby on Rails Guides
This guide covers how you can become a part of the ongoing development of Ruby on Rails. After reading this guide, you will know: How to use GitHub to report issues. How to clone main and run the test suite. How to help resolve existing issues. How to contribute to the Ruby on Rails documentation. How to contribute to the Ruby on Rails code. Ruby on Rails is not "someone else's framework". Over th
Autoloading and Reloading Constants — Ruby on Rails Guides
This guide documents autoloading, reloading, and eager loading in Rails applications. In an ordinary Ruby program, you explicitly load the files that define classes and modules you want to use. For example, the following controller refers to ApplicationController and Post, and you'd normally issue require calls for them: # DO NOT DO THIS. require "application_controller" require "post" # DO NOT DO
Configuring Rails Applications — Ruby on Rails Guides
This guide covers the configuration and initialization features available to Rails applications. After reading this guide, you will know: How to adjust the behavior of your Rails applications. How to add additional code to be run at application start time. 1 Locations for Initialization CodeRails offers four standard spots to place initialization code: config/application.rb Environment-specific co
Active Record Validations — Ruby on Rails Guides
This guide teaches you how to validate the state of objects before they go into the database using Active Record's validations feature. After reading this guide, you will know: How to use the built-in Active Record validation helpers. How to create your own custom validation methods. How to work with the error messages generated by the validation process. As you can see, our validation lets us kno
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Ruby on Rails Guides