Ruby to Ruby on Rails

Free Ruby to Ruby on Rails Code Converter

No email required. 100% free. Done in 30 seconds.

Transform your code from Ruby to Ruby on Rails with our free AI-based code convertion tool. If you like what you see, we also create documentation for your code! We don't ever store your code or any representation of it in our databases, but it will be shared with the LLM of our choice for processing.

Other tools






Ionic + Angular










React Native


Ruby on Rails






How to convert from Ruby to Ruby on Rails

Converting from Ruby to Ruby on Rails can unlock a new level of efficiency and capability for your application. While Ruby is a dynamic, reflective, object-oriented, general-purpose programming language, Ruby on Rails (often just "Rails") is a web application framework built on Ruby. This guide will help you through the process of converting Ruby code to Ruby on Rails, focusing on best practices and essential details for a seamless transition.

Understanding the Basics: Ruby vs. Ruby on Rails

Before diving into the conversion process, it is vital to understand the fundamental differences between Ruby and Ruby on Rails. While Ruby is just a language, Ruby on Rails is a full-fledged framework that uses Ruby. Rails provides a structured way to build web applications by incorporating several built-in tools that can help manage databases, maintain web pages, and handle routing, among other tasks.

Setting Up Your Rails Environment

To begin the conversion, make sure you have Ruby and Ruby on Rails installed on your machine. You can start a new Rails project with the following command:

gem install rails
rails new my_app
cd my_app

This will create a new Rails application called my_app and set up the necessary directories and files.

Structuring Your Code

Folder Structure

Rails organizes your code into MVC (Model-View-Controller) architecture. Here's a simplified structure:

  • Models: Handle data and business logic.
  • Views: Render data to the user.
  • Controllers: Manage web requests and user interactions.

Move your Ruby classes into the appropriate Rails folders:

  • Place data-related classes in /app/models.
  • Place utility or service classes in /lib.


Rails uses Bundler to manage dependencies. Move any gem requirements from your Ruby scripts into the Gemfile of your Rails project. For example:

# Gemfile
gem 'pg' # PostgreSQL database
gem 'puma' # Web server

Run bundle install to install these dependencies.

Converting Ruby Scripts into Rails Controllers and Models


If you have standalone Ruby scripts that handle HTTP requests or user inputs, convert these scripts into Rails controllers. Let's say you have a simple Ruby script:

# my_script.rb
require 'json'
data ="data.json")
puts JSON.parse(data)

Create a controller in Rails like this:

rails generate controller Data

This will create app/controllers/data_controller.rb, which you can modify as follows:

# app/controllers/data_controller.rb
class DataController < ApplicationController
  def index
    data = JSON.parse('data.json')))
    render json: data


For code dealing with data, consider converting them into Rails models. For instance, if you have a Ruby class that interacts with a database:

# user.rb
class User
  attr_accessor :name, :email

  def initialize(name, email)
    @name = name
    @name = email

Generate a Rails model using:

rails generate model User name:string email:string

This will create the database migration and the user.rb model file:

# app/models/user.rb
class User < ApplicationRecord

Run rails db:migrate to create the table in your database.

Using Rails Routes

Rails uses a powerful routing system to direct HTTP requests to the appropriate controller actions. Define these routes in config/routes.rb:

# config/routes.rb
Rails.application.routes.draw do
  get 'data/index', to: 'data#index'
  root 'data#index'

This directs the root URL to your DataController's index action.

Adding Views

If your Ruby code generates HTML or some other type of user-facing content, you can convert it into Rails views. Create view templates in app/views/YOUR_CONTROLLER_NAME/. For example, you can create index.html.erb in app/views/data/:

<!-- app/views/data/index.html.erb -->
<%= @data.each do |item| %>
  <p><%= item %></p>
<% end %>

Testing Your Code

Rails comes with a robust testing framework. Place your tests in the test or spec directory. For example, you can write a test for your controller:

# test/controllers/data_controller_test.rb
require 'test_helper'

class DataControllerTest < ActionDispatch::IntegrationTest
  test "should get index" do
    get data_index_url
    assert_response :success

Run the test with:

rails test


By following these steps, you can successfully convert your existing Ruby code to Ruby on Rails, leveraging the framework's powerful features to build robust, maintainable web applications. Remember that Rails enforces a "Convention Over Configuration" philosophy, which means adhering to its conventions will result in smoother development and fewer surprises.

Converting from Ruby to Ruby on Rails might seem daunting initially, but with practice, it will become more intuitive and rewarding.

Document your code using AI

Sign up now
& free your developers' time

Start for free

Join thousands of companies documenting their code using AI.

Frequently Asked Questions

This free AI tool does its best to generate professional documentation. However, it's missing some context from other related files. The paid version takes into account different files to generate documentation for each use case, apart from the documentation of every file. You have also the possibility of add custom concepts to improve the knowledge of your codebase.

No. You don't have to enter any personal information to use Codex's free code documentation tool — it's 100% free.

No. An encrypted version of your code is stored only while its being processed and it's deleted immediately.

If you can work with a custom Azure model in your own account, let us know. If not, Codex also works with open source models that can run on-premises, on your own servers, so your data is always yours. Feel free to get in touch with us!