Ruby on Rails AI Skill Guide (Claude)

Overview & Engine Architecture

Rails is convention-over-configuration: Router → Controller → Active Record → View/JSON. Schema changes ship only via migrations. Secrets live in credentials (RAILS_MASTER_KEY) or ENV—never plaintext in git. Rails 8 defaults production Active Job to Solid Queue (DB-backed); agents either run bin/jobs or enable the Puma solid_queue plugin with SOLID_QUEUE_IN_PUMA. Pair primary DB with @postgresql (or SQLite for small apps) and optional @redis only when you choose Redis adapters/cache deliberately.