# Aj Geddes Useful AI Prompts Ruby Rails Application

> Ruby Rails Application

- Skill: `tomevault-io/aj-geddes-useful-ai-prompts-ruby-rails-application` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/aj-geddes-useful-ai-prompts-ruby-rails-application`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/aj-geddes-useful-ai-prompts-ruby-rails-application/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/aj-geddes-useful-ai-prompts-ruby-rails-application

---


# 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:

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

## Reference Guides

Detailed implementations in the `references/` directory:

| Guide | Contents |
|---|---|
| [Rails Project Setup](references/rails-project-setup.md) | Rails Project Setup |
| [Models with Active Record](references/models-with-active-record.md) | Models with Active Record |
| [Database Migrations](references/database-migrations.md) | Database Migrations |
| [Controllers with RESTful Actions](references/controllers-with-restful-actions.md) | Controllers with RESTful Actions |
| [Authentication with JWT](references/authentication-with-jwt.md) | Authentication with JWT |
| [Active Record Queries](references/active-record-queries.md) | Active Record Queries |
| [Serializers](references/serializers.md) | 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

---
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<!-- tomevault:4.0:skill_md:2026-04-11 -->