Ruby on Rails to Dart

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How to convert from Ruby on Rails to Dart

Transitioning from Ruby on Rails to Dart can be a challenging yet rewarding endeavor. While Ruby on Rails is a powerful web application framework, Dart offers unique advantages, particularly for creating high-performance asynchronous web applications and mobile apps with Flutter. This comprehensive guide will help you navigate the conversion process, ensuring a smoother experience for developers proficient in Ruby on Rails but new to Dart.

Understanding the Basics: Ruby on Rails vs. Dart

Before diving into the conversion process, it's crucial to understand the fundamental differences between Ruby on Rails and Dart.

Ruby on Rails

  • Framework: Ruby on Rails is a server-side web application framework written in Ruby. It follows the MVC (Model-View-Controller) architecture.
  • Language: Ruby is a dynamic, interpreted language, focusing on simplicity and productivity.
  • Conventions: Rails heavily relies on "Convention over Configuration" and "Don't Repeat Yourself" (DRY) principles.


  • Language: Dart is a client-optimized language for fast apps on any platform, developed by Google. It’s used extensively for building mobile, desktop, backend, and web applications.
  • Framework: Flutter is the most common framework used with Dart, especially for mobile and web applications.
  • Paradigm: Dart is a statically typed language with a rich set of libraries and packages, emphasizing performance and seamless integration with modern tooling.

Setting Up Your Dart Environment

Step 1: Install Dart SDK

To start converting your Ruby on Rails application to Dart, you need to install the Dart SDK on your development environment.

$ brew tap dart-lang/dart
$ brew install dart

Step 2: Set Up Your Development Environment

You can use various IDEs and text editors for Dart development, such as IntelliJ IDEA, VS Code, or Android Studio, with adequate support for Dart plugins.

Converting Models

Models in Ruby on Rails encapsulate data and business logic. In Rails, a model might look like this:

class User < ApplicationRecord
  validates :name, presence: true
  has_many :posts

In Dart, you can use classes to represent models and use packages like json_serializable for data handling.

import 'package:json_annotation/json_annotation.dart';

part 'user.g.dart';

class User {
  String name;
  List<Post> posts;

  User({required, required this.posts});

  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);
  Map<String, dynamic> toJson() => _$UserToJson(this);

Handling Controllers

Rails controllers manage the flow of data between models and views. A simple Rails controller might look like this:

class UsersController < ApplicationController
  def index
    @users = User.all

  def show
    @user = User.find(params[:id])

In Dart, particularly when using a framework like Aqueduct for server-side applications, you'd structure your controllers as follows:

import 'package:aqueduct/aqueduct.dart';
import 'user.dart';

class UserController extends ResourceController {
  UserController() {
    acceptedContentTypes = [

  Future<Response> getUsers() async {
    final users = await User.getAllUsers();
    return Response.ok(users);

  Future<Response> getUserByID(@Bind.path('id') int id) async {
    final user = await User.findById(id);
    return Response.ok(user);

Converting Views

Rails utilizes ERB for view templates, which combine HTML with Ruby code. A typical ERB template might look like this:

<% @users.each do |user| %>
  <p><%= %></p>
<% end %>

In Dart, especially with Flutter for web or mobile, you’d use widgets to build your views. Here's how a simple view might look:

import 'package:flutter/material.dart';

class UserList extends StatelessWidget {
  final List<User> users;

  UserList({required this.users});

  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Users'),
      body: ListView.builder(
        itemCount: users.length,
        itemBuilder: (context, index) {
          return ListTile(
            title: Text(users[index].name),

Managing Database Connections

Rails uses ActiveRecord for ORM (Object-Relational Mapping). Conversely, Dart doesn't have a native ORM, but you can use packages such as aqueduct or sequelize-dart for database abstraction.

Ruby on Rails:

class CreateUsers < ActiveRecord::Migration[6.0]
  def change
    create_table :users do |t|
      t.string :name

Dart (Using Aqueduct):

class Migration1 extends Migration {
  Future upgrade() async {
      SchemaTable("users", [
        SchemaColumn("id", ManagedPropertyType.integer, isPrimaryKey: true, autoincrement: true),
        SchemaColumn("name", ManagedPropertyType.string),
        SchemaColumn("date_created", ManagedPropertyType.datetime)

  Future downgrade() async {}

  Future seed() async {}


The process of converting from Ruby on Rails to Dart involves a significant shift in programming paradigms and tooling. Understanding these differences and methodically translating models, controllers, views, and database abstractions will enable a smooth transition. The free code converter ensures you leverage the strengths of Dart and frameworks like Flutter, translating your existing applications into highly performant and modern codebases.

By following these guidelines, you can effectively manage your application’s transition from Ruby on Rails to Dart, ensuring maintainability, performance, and modern application standards.

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