How can David compute the discounted price of a product efficiently?

Creating a calculated attribute with a discount formula is an efficient approach for computing the discounted price of a product because it integrates the discount calculation directly into the data model. This means that whenever the product is retrieved or displayed in the application, the discounted price is automatically computed based on the defined formula.

This approach minimizes redundancy by not requiring separate handling or repeated calculations each time the discounted price is needed. It simplifies the application logic by ensuring that the discount logic is encapsulated within the attribute itself, making it easy to maintain and update if any changes to the discount structure occur.

Using an aggregate to calculate the discount, while still practical in some situations, could introduce unnecessary complexity and performance overhead compared to the simplicity of a calculated attribute. Creating a new Product entity for discounted items would lead to data duplication and complications in managing two separate entities for the same product variations. Calculating the discount manually every time would be inefficient and error-prone, as it would require repeating the same calculation logic and could lead to inconsistencies across the application.