Ruby on Rails 5 Hello World Example

Prerequisites

Text Editor: You can use any text editor which is suitable for you. We are using Sublime Text editor which features many plugins.

Browser: We are using Ubuntu default browser, Mozilla Firefox.

Hello World Example

Step 1 Create a directory jtp in which all the code will be present and will navigate from the command line.

mkdir jtp  

Step 2 Change the directory to jtp

cd jtp  

Step 3 Create a new application with the name helloWorld.

rails new helloWorld  

You will see something as shown in the below snapshot.

A helloWorld directory will be created in your system. Inside this folder there will be many files and subfolders which is actually the Rails application.

Step 4 Move in to your above created application directory that is helloWorld.

cd helloWorld  

Step 5 Rails 5 has no longer a static index page in production. There will not be a root page in the production, so we need to create it. First we will create a controller called hello for our home page.

rails generate controller hello  

You will see something as shown in the above snapshot.

Step 6 Now we need to add an index page.

In file app/views/hello/index.html.erb, write

<h2>Hello World</h2>   

<p>   

  Today is 23r March, Thursday.   

</p>

Step 7 Now we need to route the Rails to this action. Edit the config/routes.rb file to set the index page to our new method.

Add the following line in the routes.rb file,

root 'hello#index'  

Step 8 Now you can verify the page by running your server.

1. rails server  

By default, Rails server listens to the port 3000. Although you can change it with the following command.

rails server -p portNumber  

Step 9 Visit click here in your browser.