Rails installation and setup

Introduction

Rails helps you build websites quickly and easily. Installing it sets up everything you need to start making web apps.

You want to create a new web application with Ruby on Rails.

You need to set up your computer to run and test Rails projects.

You want to learn Rails by building small practice apps.

You are preparing a development environment for a team project.

You want to update Rails to the latest version for new features.

Syntax

Ruby on Rails

gem install rails
rails new myapp
cd myapp
bin/rails server

Use gem install rails to install Rails via RubyGems.

The rails new myapp command creates a new Rails project folder.

Examples

Installs the Rails gem on your system.

Ruby on Rails

gem install rails

Creates a new Rails app named 'blog' with default settings.

Ruby on Rails

rails new blog

Moves into the app folder and starts the Rails web server.

Ruby on Rails

cd blog
bin/rails server

Sample Program

This shows the basic commands to install Rails, create a new app, and start the server. The server output confirms Rails is running.

Ruby on Rails

# Step 1: Install Rails gem
# Run in terminal:
gem install rails

# Step 2: Create a new Rails app
rails new sample_app

# Step 3: Move into the app folder
cd sample_app

# Step 4: Start the Rails server
bin/rails server

# The server will start and show output like:
# => Booting Puma
# => Rails 7.x.x application starting in development
# => Listening on http://localhost:3000

# Open your browser and go to http://localhost:3000 to see the Rails welcome page.

Important Notes

Make sure Ruby is installed before installing Rails.

You may need administrator rights or use sudo on some systems to install gems.

Use rails server or bin/rails server to start the app locally.

Summary

Rails installation sets up the tools to build web apps with Ruby.

Use gem install rails and rails new to start.

Run the Rails server to see your app in a browser at localhost:3000.