Migrations are a feature of Active Record that allows you to evolve your database schema over time. Rather than write schema modifications in pure SQL, migrations allow you to use a Ruby Domain Specific Language (DSL) to describe changes to your tables. After reading this guide, you will know: Which generators you can use to create migrations. Which methods Active Record provides to manipulate you

After reading this guide, you will know: How to create a Rails application. How to generate models, controllers, database migrations, and unit tests. How to start a development server. How to experiment with objects through an interactive shell. 1 Creating a Rails AppFirst, let's create a simple Rails application using the rails new command. We will use this application to play and discover all th

This guide covers the user-facing features of Rails routing. After reading this guide, you will know: How to interpret the code in config/routes.rb. How to construct your own routes, using either the preferred resourceful style or the match method. How to declare route parameters, which are passed onto controller actions. How to automatically create paths and URLs using route helpers. Advanced tec

Ruby on Rails Guides (v7.2.1) These are the new guides for Rails 7.2 based on v7.2.1. These guides are designed to make you immediately productive with Rails, and to help you understand how all of the pieces fit together. The guides for earlier releases: Rails 7.1, Rails 7.0, Rails 6.1, Rails 6.0, Rails 5.2, Rails 5.1, Rails 5.0, Rails 4.2, Rails 4.1, Rails 4.0, Rails 3.2, Rails 3.1, Rails 3.0, an