Ruby Rails Application

Table of Contents

• [Overview](#overview)
• [When to Use](#when-to-use)
• [Quick Start](#quick-start)
• [Reference Guides](#reference-guides)
• [Best Practices](#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:

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