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name: ruby-rails-application description: > Develop Ruby on Rails applications with models, controllers, views, Active Record ORM, authentication, and RESTful routes. Use when building Rails applications, managing database relationships, and implementing MVC architecture.

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