At first glance this seems like a pretty good approach. On Sunday, November 16, 2014 9:56:11 PM UTC-7, Alex Hill wrote: > > Hi all, > > Currently discounts, tax and shipping are all dealt with in their own > separate handlers, and handled slightly differently from one another. I'd > like to unify these into a more flexible system of "cart processors", > objects which provide methods to modify the entire cart and each line item. > Whenever the cart is modified, the line items and cart totals are > recalculated by calling each of the cart processors in sequence. Think of > it like middleware for shopping carts. > > A new setting would be introduced to define the list of processors that > should be run. > > The main point of this is to make it easier to define your own discount > systems - cases like "free shipping for orders over $50" or "buy any two of > this group of products and get a third free" or "registered users get 10% > off" can't be implemented using the current discount system, and defining > your own is pretty messy. If tax and shipping can be implemented under a > system like this, it should simplify Cartridge's code in a few places as > well. > > django-shop implements this as "cart modifiers" – check out the API at > https://github.com/divio/django-shop/blob/master/shop/cart/cart_modifiers_base.py > . > > Looking for general feedback, use cases, and any concerns or issues anyone > can see with a system like this. > > Cheers, > Alex >
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