rails-service-object

To orchestrate transactions and side effects across multiple Rails models, extract the logic into a plain Ruby service object with a single `#call` method. This moves orchestration out of controllers and models, providing a clear input/output contract and making complex workflows testable.

A Rails service object is a plain Ruby class with a single public `#call` method used to coordinate cross-model workflows, payment processing, or external system interactions. Use one when orchestration logic spans multiple models or entry points like controllers, jobs, and rake tasks.

To test Rails service objects with Minitest, start from a failing RED test, implement the service step-by-step, and add explicit error-case tests for recoverable failures. This approach ensures focused, single-responsibility coverage of your orchestration logic and clear boundary definitions.

Yes, the Rails service object pattern supports dependency injection for true boundaries. You should inject dependencies only for real external system boundaries, keeping Rails validations and exceptions meaningful while maintaining a clear contract between the service and its collaborators.

Handle error cases in Rails service objects by writing explicit error-case tests for recoverable failures and defining clear input/output expectations. The service returns a clear success or failure result from its single `#call` method, ensuring that exceptions remain meaningful and callers can react appropriately.

The best way to share orchestration logic between Rails controllers, jobs, and rake tasks is to encapsulate it in a service object. By exposing a single `#call` entry point, the service provides a consistent contract that can be reused across all entry points without duplicating transaction or side-effect code.