What is the best solution to automatically calculate a total field?

db.define_table ('order_detail',
              Field('product_name'),
              Field('qtd', 'integer'),
              Field('price', 'integer'),
              Field('total', 'integer', writable=False)
)

Where  total = qtd * price

requires and a custom validator? how to do?
onvalidation on form? how to do?



-- 
Atenciosamente

-- 
=========================
Alexandre Andrade
Hipercenter.com
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