Itai Tavor wrote:
> I have the following ZClasses, with matching Specialists:
> Product, Graphic, Order, OrderLineItem. When a customer adds a product
> to their order, they have to provide a graphic file which will be
> printed on the product (imagine buying a lunch box with your cat's photo
> on it). The Graphics Specialist can provide a addGraphicSnippet form.
> But who's responsible for asking for this graphic when adding the
> product to the order? Is it still the Product object? But a Product
> turns into a Product-with-Graphic only when it's a part of an order, so
> is it correct for the Product to even know about Graphics? the
> alternative is to move the addToOrder methods to either Order or
> OrderLineItems, but this doesn't make any more sense because these would
> then have to know a lot more about a Product than is good for them. Any
Sounds to me like you have a new type of Product.
You have your basic products (of which there are many kinds), and you
have ProductWithGraphic products. A ProductWithGraphic is a "calculated
product": it is composed of a basic product and a graphic. Its cost,
delivery time, packing charge, and so forth, are calculated based on the
combination of the basic product and the graphic.
To the rest of the application, a ProductWithGraphic is just another
kind of product.
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