Rails Conventions Opinionated Rails patterns for clean, maintainable code. Core Philosophy 1. Duplication Complexity : Simple duplicated code beats complex DRY abstractions - "I'd rather have four simple controllers than three complex ones" 2. Testability = Quality : If it's hard to test, structure needs refactoring 3. Adding controllers is never bad. Making controllers complex IS bad. Turbo Streams Simple turbo streams MUST be inline in controllers: Controller & Concerns Business logic belongs in models or concerns, not controllers. Service Extraction Extract when you see MULTIPLE of: - Comp…