Backend frameworks

Ruby on Rails

The framework that defined "convention over configuration". Rails turns a few commands into a full CRUD app — model, migration, controller, views and routes — with the legendary rails generate scaffold.

Demo 01

`rails generate scaffold Post`

This single command is Rails' party trick. Type a model name and fields, click run, and watch the entire CRUD feature stream into existence.

rails g scaffold

Demo 02

RESTful routes Rails gives you

One line — resources :posts — generates seven conventional routes. Here's the simulated rails routes output.

# config/routes.rb
Rails.application.routes.draw do
  resources :posts
end

→ rails routes:

Verb	URI Pattern	Controller#Action
GET	/posts	posts#index
GET	/posts/new	posts#new
POST	/posts	posts#create
GET	/posts/:id	posts#show
GET	/posts/:id/edit	posts#edit
PATCH	/posts/:id	posts#update
DELETE	/posts/:id	posts#destroy

Demo 03

Active Record in the rails console

Active Record is Rails' ORM. Run queries against a simulated posts table — and see the SQL it produces, just like the real rails console.

Demo 04

Controller action → response

A controller action pulls data and renders. Click an action to "request" it through the simulated server.

# app/controllers/posts_controller.rb
class PostsController < ApplicationController
  def index
    @posts = Post.all
    render json: @posts
  end

  def show
    @post = Post.find(params[:id])
    render json: @post
  end
end

Demo 05

The Rails doctrine

Why Rails feels so fast to build with.

Convention over configuration — sensible defaults mean almost no boilerplate.

DRY — Active Record, generators and partials kill repetition.

Full-stack & integrated — ORM, routing, mailers, jobs, Hotwire — one cohesive package.

Built on Ruby — readable, expressive code that's a joy to write.

The scaffold generator, rails routes table, Active Record console and controller responses are simulated with vanilla JavaScript — real Rails runs Ruby on a server (Puma) with a real database. The code blocks show genuine Ruby/Rails/Active Record syntax. The shared CSS shell provides page styling.

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