# ruby-rails

This skill hands your agent Rails conventions: generators over boilerplate, ActiveRecord patterns, Hotwire, background jobs and tests. Useful on a fresh app or an existing one.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 862 installs · ★ 286
- Author: Mindrally
- License: Apache-2.0 · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/Mindrally/skills/tree/HEAD/ruby-rails/SKILL.md
- Updated: 2026-10-08
- HTML: https://affpapa.org/en/nevibecode/skills/ruby-rails

## What it does

The skill covers Ruby and Rails development: idiomatic Ruby, Convention over Configuration, the Ruby Style Guide. It tells the agent to scaffold with `bin/rails generate ...` instead of writing boilerplate by hand, and to run the dev server with `bin/dev`.

Sections cover architecture, frontend, security and testing. For the database it recommends PostgreSQL with indexes, connection pooling and reversible migrations, eager loading against N+1, fragment and Russian Doll caching, service objects for complex logic. On Rails 8 it points to Solid Queue, Solid Cache, Solid Cable, Propshaft and Kamal instead of external services. Interactivity goes through Hotwire (Turbo and Stimulus), styling through Tailwind CSS, reusable UI through ViewComponents.

Testing means Minitest or RSpec with TDD, FactoryBot for data, mocked external services, independent tests. Auth is Devise or Pundit, plus strong parameters and CSRF tokens. One caveat worth checking: the skill advises against adding a Vite-managed npm pipeline by default, so reach for it only when the project actually has React or Vue components.

## Requirements
- Works with: PostgreSQL

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill ruby-rails -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/ruby-rails/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/ruby-rails/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill ruby-rails -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/ruby-rails/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill ruby-rails -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/ruby-rails/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install Mindrally/skills ruby-rails
```

2. **Manually: put the files in place**
- File: `.github/skills/ruby-rails/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill ruby-rails -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/Mindrally/skills --path ruby-rails
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/ruby-rails/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill ruby-rails -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/Mindrally/skills/tree/HEAD/ruby-rails/SKILL.md

## When to use it
- scaffold a Rails app without hand-writing boilerplate
- design ActiveRecord models and safe reversible migrations
- kill N+1 queries with eager loading
- wire up Turbo and Stimulus without full page reloads
- write RSpec or Minitest coverage with FactoryBot

## Example prompts
- Generate an Order model with a migration and an index on user_id
- Rewrite this controller so loading orders doesn't trigger N+1
- Add a Turbo Frame that refreshes the task list without a reload

## Source text · SKILL.md · Apache-2.0

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: b059fce40f6596d3.

BEGIN THIRD-PARTY FILE b059fce40f6596d3
```text
---
name: ruby-rails
description: "Conventions and best practices for building web applications with Ruby on Rails. Use when scaffolding Rails apps or generators, designing ActiveRecord models and migrations, wiring up Hotwire/Turbo/Stimulus interactivity, setting up background jobs or caching, or writing RSpec/Minitest coverage for Rails code."
metadata:
  maintainer: Mindrally
  source: https://github.com/Mindrally/skills
---

# Ruby on Rails

This skill covers Ruby and Ruby on Rails development, including Rails conventions, ActiveRecord patterns, frontend integration, security, and testing.

## Core Principles

- Write concise, idiomatic Ruby code with accurate examples
- Adhere to Rails conventions (Convention over Configuration)
- Follow the Ruby Style Guide for formatting consistency
- Leverage Ruby 3.x features like pattern matching and endless methods
- Prefer Rails command-line generators (`bin/rails generate ...`) over hand-written boilerplate — they keep files consistent with framework conventions and wire up tests/routes automatically
- Use `bin/dev` to run the local development server (it boots the web process plus any configured watchers) and check logs after significant changes

## Naming Conventions

- Use snake_case for files, methods, and variables
- Use CamelCase for classes and modules
- Follow Rails naming conventions for models, controllers, views

## Architecture & Performance

- Utilize ActiveRecord for database operations with proper indexing
- Use PostgreSQL in production, with proper indexes, connection pooling, and safe/reversible migrations
- Implement eager loading to prevent N+1 query problems
- Apply fragment caching and Russian Doll caching strategies
- Use service objects for complex business logic
- Follow MVC architecture strictly
- Keep controllers RESTful and focused

## Rails 8 Defaults

Rails 8 ships with a "no PaaS needed" stack — favor these built-ins over adding external services unless there's a specific reason not to:

- **Solid Queue** — database-backed ActiveJob adapter; use it as the default background job backend instead of standing up Redis/Sidekiq unless job volume or feature needs (e.g., Sidekiq Pro batches) require it
- **Solid Cache** — database-backed cache store; a reasonable default for Rails.cache without a separate Redis/Memcached deployment
- **Solid Cable** — database-backed Action Cable adapter for WebSockets without Redis
- **Propshaft** — the default asset pipeline; simpler than Sprockets, just serves fingerprinted files without a bundling step
- **Kamal** — the default deployment tool for shipping containerized Rails apps to your own servers

## Frontend & UI
```
END THIRD-PARTY FILE b059fce40f6596d3

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