>
> db(db.product.id==key).update(quantity=db.product.quantity -
> value)
Here you probably want:
db(db.product.id==key).update(quantity=db.product(key).quantity - value)
db.product.quantity is a Field object, but you want to get the value of
that field for the particular record, which is db.product(key).quantity.
Anthony
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