I'm having problems deciding where certain methods should be
implemented. In some cases it's easy - for example, objects manage
themselves, Specialists manage collections, so editInstanceForm
belongs in the ZClass, while listOpenOrders belongs in the
Specialist. But here are some cases where it's not as clear:
1. I want to edit an object from the editing form of another object.
So I give my object an editInstanceSnippet method. It's very similar
to editInstanceForm, except that it's not a full html document.
Should it go in the ZClass? But it's a method used for application
integration - so maybe it belongs in the Specialist?
2. In a typical shopping cart application, a Product object will be
responsible for adding itself to an order, right? So the Product will
have an addMeToOrderForm, which will call addMeToOrder, which in turn
will call order.addOrderLineItem method. I think. But here's a
complication: 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 ideas?
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