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Rails Expert

Purpose

Provides expert Ruby on Rails development expertise specializing in Rails 7+ modern features, Hotwire stack (Turbo, Stimulus), and modern Rails patterns. Excels at building full-stack web applications with server-rendered HTML, real-time updates, and structured client-side behavior without heavy JavaScript frameworks.

When to Use

• Building modern Rails 7+ applications with Hotwire (Turbo, Stimulus)
• Implementing real-time features with Turbo Streams and Action Cable
• Migrating legacy Rails apps to modern Rails patterns and conventions
• Building API-first Rails applications with JSON:API or GraphQL
• Optimizing Rails application performance (database queries, N+1, caching)
• Implementing complex Rails patterns (Service Objects, Form Objects, Query Objects)
• Integrating Rails with modern frontend tools (Import Maps, esbuild, Vite)

Quick Start

Invoke this skill when:

• Building Rails 7+ apps with Hotwire/Turbo/Stimulus
• Implementing real-time features (Turbo Streams, Action Cable)
• Migrating legacy Rails to modern patterns
• Building API-first Rails (JSON:API, GraphQL)
• Optimizing performance (N+1, caching, eager loading)
• Using Rails patterns (Service Objects, Form Objects, Query Objects)

Do NOT invoke when:

• Only frontend development needed → Use frontend-developer or react-specialist
• Database-specific optimization → Use database-optimizer or postgres-pro
• Pure API design without Rails → Use api-designer
• DevOps/deployment only → Use devops-engineer

Core Capabilities

Rails 7+ Modern Features

• Hotwire : Turbo, Stimulus, and dynamic HTML updates without JavaScript frameworks
• Import Maps : JavaScript dependency management without build tools
• Rails 7 Action Text : Rich text editing with modern UI
• Encrypted Credentials : Enhanced security for sensitive data
• Async Query Loading : Improved database query performance
• Multi-DB Support : Primary/replica database configurations
• Parallel Testing : Faster test execution across processes
• Async Action Mailer : Non-blocking email delivery

Hotwire Stack

• Turbo Drive : Faster page navigation with automatic page caching
• Turbo Frames : Partial page updates without full reloads
• Turbo Streams : Real-time updates over WebSocket or SSE
• Stimulus Controllers : Structured client-side JavaScript behavior
• Turbo Morph : Smart DOM diffing for minimal re-renders

Modern Rails Patterns

• Service Objects : Extract business logic from controllers
• Query Objects : Complex database queries as reusable objects
• Form Objects : Handle complex form logic and validation
• Decorators : Presentational logic separation
• View Components : Reusable UI component architecture
• API Resources : Consistent API response formatting

Decision Framework

Rails Feature Selection

Rails Development Decision
├─ Need real-time updates
│   ├─ User-specific updates → Turbo Streams + Action Cable
│   ├─ Broadcast to multiple users → Action Cable channels
│   └─ Simple form responses → Turbo Streams over HTTP
│
├─ Frontend architecture
│   ├─ Minimal JS, server-rendered → Hotwire (Turbo + Stimulus)
│   ├─ Complex client-side logic → Rails API + React/Vue
│   └─ Hybrid approach → Turbo Frames for islands of interactivity
│
├─ Database strategy
│   ├─ Read-heavy workload → Multi-DB with read replicas
│   ├─ Complex queries → Query Objects + proper indexing
│   └─ Caching needed → Russian doll caching + fragment caching
│
└─ Code organization
    ├─ Fat models → Extract Service Objects
    ├─ Complex validations → Form Objects
    └─ Business logic in controllers → Move to services

Performance Optimization Matrix

Best Practices

Rails 7+ Features

• Hotwire First : Use Turbo/Stimulus before reaching for JS frameworks
• Import Maps : Manage JS dependencies without complex bundlers
• Async Query Loading : Leverage parallel query execution
• Multi-DB : Use read replicas for read-heavy workloads

Code Organization

• Service Objects : Extract business logic from controllers
• Query Objects : Encapsulate complex database queries
• Form Objects : Handle complex form validation logic
• View Components : Create reusable, testable UI components

Performance

• Eager Loading : Always use includes/preload for associations
• Counter Caches : Pre-calculate counts for associations
• Caching Strategy : Implement multi-level caching
• Database Indexes : Add indexes based on query patterns

Testing

• System Tests : Use for critical user journeys
• Component Tests : Test View Components in isolation
• Request Tests : Test API endpoints comprehensively
• Model Tests : Test business logic at unit level

Anti-Patterns

Architecture Anti-Patterns

• Fat Controllers : Business logic in controllers - use Service Objects and POROs
• Massive Models : Models handling too many responsibilities - extract concerns
• Callback Spaghetti : Complex callback chains - use service objects
• Skinny Controller, Fat Model : All logic in model - balance distribution

Database Anti-Patterns

• N+1 Queries : Not using eager loading - use includes/joins/preload
• Missing Indexes : Slow queries without proper indexes - analyze and add
• Counter Cache Miss : Repeated count queries - use counter caches
• Migrations Without Down : Non-reversible migrations - ensure reversibility

Performance Anti-Patterns

• Eager Loading Excess : Over-eager loading causing memory issues
• Missing Caching : No caching strategy - implement appropriate levels
• Render Bloat : Heavy view rendering - use fragments and caching
• Job Queue Backlog : No background job processing - use Active Job

Additional Resources

• Detailed Technical Reference : See REFERENCE.md
• Code Examples & Patterns: See EXAMPLES.md

Weekly Installs

54

Repository

404kidwiz/claud…e-skills

GitHub Stars

42

First Seen

Jan 24, 2026

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