Hello,
I'm trying to create a simple warehouse app on GAE, but I'm stuck with
the design of my models.
Here are my thoughts about the design:
Inventory -> Goods (id, quantity, prices and etc) -> Groups
Customer (id,name) -> Order(Date) -> OrderItem(GoodId, price, quantity)
Operation: Order single item
In this case when new sale is performed a new record need to be added to
the Order table and after that inventory table
need to be updated too. And here is the problem, on GAE transactions can
be applied only on a single entity group where
in this case I have 2 different entity groups and I need to update both
of them.
Other operations: View Customer Orders for a period, View Quantity of a
given Good, View Goods of a given group with quantity lower then
specified value
Any idea how to handle this?
Regards,
Miroslav
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