rails

This skill should be used when the user wants to debug performance issues, investigate N+1 queries, analyze slow requests, profile memory usage, or understand query patterns in a Ruby on Rails application. Activates on: "debug performance", "N+1 queries", "slow request", "query analysis", "memory profiling", "rails performance", "find slow queries", "bullet", "why is this slow", "optimize queries", "eager loading", "database performance", "debug rails", "profile request", "analizzare performance", "query lente".

This skill should be used when running Rails database migrations and committing the resulting schema changes. Ensures a clean schema diff by running migrations against the test database reset from main, not the potentially dirty development database. Activates on: "run migration", "run migrations", "migrate database", "commit migration", "db:migrate", "schema change", "clean schema diff", "migration workflow", "eseguire migrazione", "lanciare migrazione".

This skill should be used when the user wants to refactor Ruby on Rails code by extracting service objects, concerns, query objects, form objects, or DelegateClass wrappers. Identifies code smells and applies established Rails refactoring patterns. Activates on: "refactor", "extract service", "extract concern", "fat model", "fat controller", "code smell", "service object", "query object", "form object", "too complex", "simplify", "extract class", "single responsibility", "rails refactor", "clean up code", "rifattorizzare", "estrarre servizio".

This skill should be used when the user wants to write, scaffold, or improve tests in a Ruby on Rails application. Covers RSpec organization, FactoryBot patterns, request/model/service specs, VCR setup for HTTP stubbing, and test-driven development workflows. Activates on: "write tests", "add specs", "rspec", "factory bot", "test this", "spec for", "scaffold test", "write spec", "missing tests", "test coverage", "VCR cassette", "stub http", "testing strategy", "TDD", "test driven", "rails test", "how to test", "scrivere test", "aggiungere spec".

This skill should be used when upgrading a Rails application from one minor version to the next. Guides the full upgrade process: updating gems, running app:update, booting the app, fixing deprecation warnings, running tests, and progressively enabling new framework defaults. Enforces one minor version per invocation following Rails' official recommendation. Activates on: "upgrade rails", "upgrade to Rails", "rails upgrade", "update rails version", "bump rails", "next rails version", "rails version upgrade", "upgrade my rails app", "move to Rails", "rails upgrade path", "aggiornare rails", "aggiornamento rails".