Compress the complexity of modern web apps.
Learn just what you need to get started, then keep leveling up as you go. Ruby on Rails scales from HELLO WORLD to IPO.
You’re in good company.
Over the past two decades, Rails has taken countless companies to millions of users and billions in market valuations.
These are just a few of the big names. There have been many hundreds of thousands of apps created with Rails since its inception.
Building it together.
Over six thousand people have contributed code to Rails, and many more have served the community through evangelism, documentation, and bug reports. Join us!
Everything you need.
Rails is a full-stack framework. It ships with all the tools needed to build amazing web apps on both the front and back end.
Rendering HTML templates, updating databases, sending and receiving emails, maintaining live pages via WebSockets, enqueuing jobs for asynchronous work, storing uploads in the cloud, providing solid security protections for common attacks. Rails does it all and so much more.
app/models/article.rb
class Article < ApplicationRecord belongs_to :author, default: -> { Current.user } has_many :comments has_one_attached :cover_image has_rich_text :content, encrypted: true enum status: %i[ drafted published ] scope :recent, -> { order(created_at: :desc).limit(25) } after_save_commit :deliver_later, if: :published? def byline "Written by #{author.name} on #{created_at.to_s(:short)}" end def deliver_later Article::DeliveryJob.perform_later(self) end endActive Records make modeling easy.
Databases come to life with business logic encapsulated in rich objects. Modeling associations between tables, providing callbacks when saved, encrypting sensitive data seamlessly, and expressing SQL queries beautifully.
app/controllers/articles_controller.rb
class ArticlesController < ApplicationController def index @articles = Article.recent end def show @article = Article.find(params[:id]) fresh_when etag: @article end def create article = Article.create!(article_params) redirect_to article end private def article_params params.require(:article).permit(:title, :content) end endAction Controllers handle all requests.
Controllers expose the domain model to the web, process incoming parameters, set caching headers, and render templates, responding with either HTML or JSON.
app/views/articles/show.html.erb
<h1><%= @article.title %></h1> <%= image_tag @article.cover_image.url %> <p><%= @article.content %></p> <%= link_to "Edit", edit_article_path(@article) if Current.user.admin? %>Action Views mix Ruby and HTML.
Templates can use the full versatility of Ruby, excessive code is extracted into helpers, and the domain model is used directly and interwoven with the HTML.
config/routes.rb
Rails.application.routes.draw do resources :articles do # /articles, /articles/1 resources :comments # /articles/1/comments, /comments/1 end root to: "articles#index" # / endAction Dispatch routes URLs.
Configure how URLs connect to the controllers using the routing domain language. Routes expose the bundle of actions that go together as a resource: index, show, new, create, edit, update, destroy.
Optimized for happiness.
Rails has united and cultivated a strong tribe around a wide set of heretical thoughts about the nature of programming and programmers. Understanding these thoughts will help you understand the design of the framework.
Let’s get started.
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