Scott,
Thanks for the great book, it's got my head spinning a little but I like the very structured approach to the way you design your code.

I'm playing around with the Agatha's storefront code, and I'm interested in trying to add support for custom discount rules similar to what Magento describes here: http://www.magentocommerce.com/knowl...-do-i-use-them

Any ideas or help you can give me to get started would be much appreciated. Should I create a "DiscountService" class that has some methods on it to take in Product or Cart objects and applies discounts to them, and then hands them back to the cart to update and persist to the DB? Should the Cart or Product classes know how to "discount itself" or should that functionality be injected in somehow?

Hi ksouthworth,

Sorry for the late reply!

Maybe the cart should be responsible for applying a discount to itself but something else needs to be responsible for determining if the cart satisfies the rules of a discount/voucher. E.g. You can pass the cart to a discount service and it will arrive at a discount amount it can then tell the cart to deduct that amount from the total price?

Let me know if you wantbto discuss this further as I realise you posted this question a while ago.

Cheers
Scott