refactor:rails

Refactor fat Rails controllers and models by extracting business logic into service objects, moving shared behavior into concerns, and replacing complex database fetches with query objects to enforce SRP and DRY principles.

Use service objects and query objects in Rails when controllers or models accumulate excessive business logic or complex database interactions, requiring extraction into focused classes to restore maintainability and single responsibility.

Clean up Rails code by applying Ruby 3.3 pattern matching to simplify complex conditional logic and using Data classes for immutable value objects, reducing boilerplate and improving readability within service objects.

Refactoring Rails code into concerns and service objects preserves external interfaces, ensuring that the visible behavior of controllers and models stays identical while internally restructuring the logic for better maintainability.

Structure a Rails 8 codebase by placing business logic in app/services, shared behaviors in app/models/concerns, and complex fetches in app/queries, leveraging idiomatic patterns to keep classes focused and DRY.

Refactor Rails apps with fat models by extracting complex database interactions into query objects, allowing you to encapsulate queries without altering the underlying database schema or breaking existing external behavior.