refactor:fastapi

What problem does it solve?

This Skill helps teams convert monolithic FastAPI routes into clean, modular services aligned with SOLID principles, reducing maintenance burden and improving testability.

Core Features & Use Cases

• Skinny routes with fat services: move business logic into service classes.
• Dependency injection patterns: compose repositories, services, and adapters via DI.
• Async/await best practices: ensure non-blocking I/O and proper use of async def and await.
• Domain-driven structure: organize code by domain to improve readability and evolution.
• Use Case: refactor a route that handles user registration into a thin route that delegates to a UserService, then add unit tests for the service.

Quick Start

Refactor a provided FastAPI route from a monolithic handler to a thin route that delegates to a dedicated service. Add Pydantic v2 models and DI for database access. Ensure all I/O is non-blocking and tests cover the service layer.