Ruby: Crafting your first "hello world" application with Ruby on Rails

This documentation is part of the Getting started guide. You can view the complete guide here: Getting started with Ruby on Rails.

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Let's walk through the process of creating a simple "Hello World" application using Ruby on Rails.

1. First, set up a new route for your application. Open the config/routes.rb file and define a root route that points to the hello#index action:

   Rails.application.routes.draw do
     root "hello#index"
   end
   

2. Next, generate the Hello controller to manage the logic for this route. Run the following command in your terminal:

   bin/rails generate controller Hello index --skip-routes
   

   With this configuration, any request made to the URL path / will be handled by the HelloController.

3. To display the "Hello World" message, create a view. Open the file at app/views/hello/index.html.erb and replace any existing content with the following code:

   <h1>Hello World!</h1>
   

4. Finally, start the Rails server by running the command below in your terminal. Then, connect to your development URL (for example, http://<XXXXXX>.stackhero-network.com:3000) to view your application:

   bin/rails server -b 0.0.0.0
   

   First "Hello World" page in Ruby on Rails

Congratulations. You have just created your first Ruby on Rails application!