# Rails Expert

> Rails 7+ specialist that optimizes Active Record queries with includes/eager_load, implements Turbo Frames and Turbo Streams for partial page updates, configures Action Cable for WebSocket connections, sets up Sidekiq workers for background job processing, and writes comprehensive RSpec test suites. Use when building Rails 7+ web applications with Hotwire, real-time features, or background job pr…

- **Type:** Skill
- **Install:** `agentstack add skill-jeffallan-claude-skills-rails-expert`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [Jeffallan](https://agentstack.voostack.com/s/jeffallan)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [Jeffallan](https://github.com/Jeffallan)
- **Source:** https://github.com/Jeffallan/claude-skills/tree/main/skills/rails-expert

## Install

```sh
agentstack add skill-jeffallan-claude-skills-rails-expert
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Rails Expert

## Core Workflow

1. **Analyze requirements** — Identify models, routes, real-time needs, background jobs
2. **Scaffold resources** — `rails generate model User name:string email:string`, `rails generate controller Users`
3. **Run migrations** — `rails db:migrate` and verify schema with `rails db:schema:dump`
   - If migration fails: inspect `db/schema.rb` for conflicts, rollback with `rails db:rollback`, fix and retry
4. **Implement** — Write controllers, models, add Hotwire (see Reference Guide below)
5. **Validate** — `bundle exec rspec` must pass; `bundle exec rubocop` for style
   - If specs fail: check error output, fix failing examples, re-run with `--format documentation` for detail
   - If N+1 queries surface during review: add `includes`/`eager_load` (see Common Patterns) and re-run specs
6. **Optimize** — Audit for N+1 queries, add missing indexes, add caching

## Reference Guide

Load detailed guidance based on context:

| Topic | Reference | Load When |
|-------|-----------|-----------|
| Hotwire/Turbo | `references/hotwire-turbo.md` | Turbo Frames, Streams, Stimulus controllers |
| Active Record | `references/active-record.md` | Models, associations, queries, performance |
| Background Jobs | `references/background-jobs.md` | Sidekiq, job design, queues, error handling |
| Testing | `references/rspec-testing.md` | Model/request/system specs, factories |
| API Development | `references/api-development.md` | API-only mode, serialization, authentication |

## Common Patterns

### N+1 Prevention with includes/eager_load

```ruby
# BAD — triggers N+1
posts = Post.all
posts.each { |post| puts post.author.name }

# GOOD — eager load association
posts = Post.includes(:author).all
posts.each { |post| puts post.author.name }

# GOOD — eager_load forces a JOIN (useful when filtering on association)
posts = Post.eager_load(:author).where(authors: { verified: true })
```

### Turbo Frame Setup (partial page update)

```erb

  
  

  
  

```

```ruby
# app/controllers/posts_controller.rb
def index
  @posts = Post.includes(:author).page(params[:page])
  @next_page = @posts.next_page
end
```

### Sidekiq Worker Template

```ruby
# app/jobs/send_welcome_email_job.rb
class SendWelcomeEmailJob  e
    Rails.logger.warn("SendWelcomeEmailJob: user #{user_id} not found — #{e.message}")
    # Do not re-raise; record is gone, no point retrying
  end
end

# Enqueue from controller or model callback
SendWelcomeEmailJob.perform_later(user.id)
```

### Strong Parameters (controller template)

```ruby
# app/controllers/posts_controller.rb
class PostsController 95% coverage
- Use service objects for complex business logic; keep controllers thin
- Add database indexes for every column used in `WHERE`, `ORDER BY`, or `JOIN`
- Offload slow operations to Sidekiq — never run them synchronously in a request cycle

### MUST NOT DO
- Skip migrations for schema changes
- Use raw SQL without sanitization (`sanitize_sql` or parameterized queries only)
- Expose internal IDs in URLs without consideration

## Output Templates

When implementing Rails features, provide:
1. Migration file (if schema changes needed)
2. Model file with associations and validations
3. Controller with RESTful actions and strong parameters
4. View files or Hotwire setup
5. Spec files for models and requests
6. Brief explanation of architectural decisions

[Documentation](https://jeffallan.github.io/claude-skills/skills/backend/rails-expert/)

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [Jeffallan](https://github.com/Jeffallan)
- **Source:** [Jeffallan/claude-skills](https://github.com/Jeffallan/claude-skills)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** yes
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-jeffallan-claude-skills-rails-expert
- Seller: https://agentstack.voostack.com/s/jeffallan
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.