Hi,
The OrderTaxDetail model gives the taxes applying to an order. The
OrderItem keeps the amount of taxes for an order item.
In Canada, we need to display the detail of all taxes to the customer.
So an order with 2 items would look like the following (we don't need
to display the taxes for each items on the invoice, only for the taxes
total, but it helps to show what the item model must store):
Item1 Price Tax1 Tax2 Total for item1
Item2 Price Tax1 Tax2 Total for item2
-----------------------------------------------------------
Total: Amount$ Tax1 Tax2 Total to be paid
The OrderItem gives the amount (Tax1+Tax2) for each item of the order.
Our problem is that we need to create an OrderItemTaxDetail to keep
the amount calculated for each tax for an item. This generalization
would have impacts on the Order model, the TaxProcessor and all
existing tax models would have to be adapted, create a new tax model
or adapt the area one, change tags for displaying the invoice, and
probably touch other parts of Satchmo I don't know. This change would
have a big impact on existing stores, because it needs to upgrade the
database tables.
On the other hand, we could just add a Tax2 field to the Order model,
and create a new tax processor aware of this new field. The changes in
Satchmo would be to the same places but somewhat limited. The database
upgrade would be a simple column addition. But I feel this is just a
hack. What would we do if some country needs a 3 levels tax process,
for instance federal, state and county?
>From my point of view, it seems the first solution is better in the
long term. But it requires us to change the core of Satchmo, and we
want to be able to follow the version upgrades to keep our store as
vanilla as possible. So it means that our changes would have to get
into the core code. But as I said, the upgrade path would be more
difficult for existing stores.
What do you think?
--
Pierre Métras
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