عرض عملي: فصل DTOs عن نماذج النطاق

خطوة بخطوة

1. Call the endpoint and see the raw Product JSON, including internal costCents.
2. Create ProductResponse with only public fields.
3. Add a mapper method toResponse(Product).
4. Planned mistake: reuse one ProductDto for create, update, and response; clients can then send an id or change fields they should not. Fix: CreateProductRequest, UpdateProductRequest, ProductResponse.
5. Rename a domain field and show the API response does not change.