I have the following table:

db.define_table('cart',
                Field('quantity','integer'),
                Field('in_stock','integer',writable=False,represent=lambda 
v, r: 'Pre-ordered' if v < 0 else '√'),
                Field('price','float',writable=False,represent=lambda v, r: 
'C'+locale.currency(v,grouping=True)),
                Field('subtotal','float',represent=lambda v, r: 
'C'+locale.currency(v,grouping=True),
                    compute=lambda r: r.price*r.quantity))

I find that when I update the 'quantity' field, the 'subtotal' field does 
NOT get recomputed. Is this a bug, or expected behaviour?

Thanks.

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