Develop Robust Ruby on Rails Applications

This skill provides guidelines for Ruby on Rails development with a focus on Rails 8 conventions and a modern stack. It covers stack preferences including SQLite3 as the database, Hotwire for dynamic interactions, Tailwind CSS for styling, and the Solid suite (SolidQueue for queues, SolidCable for WebSockets, SolidCache for caching). The guidelines emphasize minimizing unnecessary JavaScript in favor of Rails 8 Turbo Streams, writing concise idiomatic Ruby code, and following Rails conventions and best practices.

Use this skill for Ruby on Rails development projects using SQLite3 as the preferred database and the Solid libraries for infrastructure concerns. The guidelines cover background job processing with SolidQueue for long tasks such as external API accessing (like Stripe API sync), real-time features via SolidCable WebSockets, and caching with SolidCache for loading potentially frequently accessed views or partials. The skill covers RESTful routing conventions, MVC structure, concerns for shared behavior, service objects for complex business logic, and background jobs for time-consuming tasks.

Do NOT use this skill if your project requires Redis, Sidekiq, or relies heavily on JavaScript - the guidelines explicitly avoid unnecessary JavaScript and prefer Rails alternatives. Do NOT use it for non-Rails Ruby projects or applications that need databases other than SQLite3 as the preferred data store.

You provide development requirements, feature descriptions, or architectural questions for a Rails application. The guidelines cover stack preferences: SQLite3 database, Hotwire (Turbo and Stimulus), Tailwind CSS, SolidQueue for queues, SolidCable for WebSockets, and SolidCache for caching.

The guidelines specify code style conventions including snake_case for file names, method names, and variables; CamelCase for class and module names; and Rails naming conventions for models, controllers, and views. They cover ActiveRecord for database operations, ActiveModel validations in models, strong parameters in controllers, Rails view helpers and partials, and Stimulus for client-side behavior. Error handling guidelines include using exceptions for exceptional cases (not control flow), proper error logging, graceful error handling in controllers with flash messages, and security measures including authentication (rails g authentication), authorization, and protection against XSS, CSRF, and SQL injection. Performance optimization guidelines include database indexing, caching strategies (fragment caching, Russian Doll caching), eager loading to avoid N+1 queries using includes, joins, or select, service objects for complex business logic, and background jobs for time-consuming tasks.

The skill covers Ruby on Rails (with Ruby 3.x features), SQLite3 database, Hotwire including Turbo and Stimulus, Tailwind CSS, SolidQueue for background job processing, SolidCable for WebSocket connections, and SolidCache for caching views and partials. It references the Ruby Style Guide for formatting and the official Ruby on Rails guides for best practices in routing, controllers, models, views, and other Rails components.

This skill serves developers working on Ruby on Rails projects who want guidelines for using SQLite3, the Solid suite of libraries, and Rails 8 conventions. It fits those adopting SQLite3 as the preferred database, migrating away from Redis and Sidekiq to Rails alternatives, and preferring to avoid unnecessary JavaScript in favor of Turbo Streams. It benefits developers seeking to follow Ruby 3.x features (pattern matching, endless methods), implement object-oriented and functional programming patterns as appropriate, and structure applications according to Rails conventions including MVC, concerns, and helpers.