---name: ruby-rails-applicationdescription: >---

Ruby Rails Application

Table of Contents

• Overview
• When to Use
• Quick Start
• Reference Guides
• Best Practices

Overview

Build comprehensive Ruby on Rails applications with proper model associations, RESTful controllers, Active Record queries, authentication systems, middleware chains, and view rendering following Rails conventions.

When to Use

• Building Rails web applications
• Implementing Active Record models with associations
• Creating RESTful controllers and actions
• Integrating authentication and authorization
• Building complex database relationships
• Implementing Rails middleware and filters

Quick Start

Minimal working example:

rails new myapp --api --database=postgresql
cd myapp
rails db:create

Reference Guides

Detailed implementations in the references/ directory:

Guide	Contents
Rails Project Setup	Rails Project Setup
Models with Active Record	Models with Active Record
Database Migrations	Database Migrations
Controllers with RESTful Actions	Controllers with RESTful Actions
Authentication with JWT	Authentication with JWT
Active Record Queries	Active Record Queries
Serializers	Serializers

Best Practices

✅ DO

• Use conventions over configuration
• Leverage Active Record associations
• Implement proper scopes for queries
• Use strong parameters for security
• Implement authentication in ApplicationController
• Use services for complex business logic
• Implement proper error handling
• Use database migrations for schema changes
• Validate all inputs at model level
• Use before_action filters appropriately

❌ DON'T

• Use raw SQL without parameterization
• Implement business logic in controllers
• Trust user input without validation
• Store secrets in code
• Use select * without specifying columns
• Forget N+1 query problems (use includes/joins)
• Implement authentication in each controller
• Use global variables
• Ignore database constraints