How should I implement automatic currency conversion in a sales order system without embedding domain-specific rules into the UI layer? Seeking advice for a clean separation.
In my experience, a clean separation between the business rules and the UI can be achieved by utilizing a dedicated service layer. I implemented a backend service that encapsulated the currency conversion logic along with other domain rules. The frontend then only needed to interact with this service, limiting its concerns to data presentation and user interaction. This approach not only made the system more modular and testable but also allowed for independent evolution of both the business logic and the user interface, reducing potential bugs when changes occurred.