a, i understand right now, thank you so much for your explaination and the
test example niphlod.
While update()ing fields are translated to column names, so you don't have
> to fetch the record just to increment it.
>
> >>>db.define_table('myupdates', Field('quantity', 'integer'))
> >>>db(db.myupdates.id == 1)._update(quantity=db.myupdates.quantity + 1)
> 'UPDATE myupda SET quantity=(myupda.quantity + 1) WHERE (myupda.id = 1);'
>
>
> That piece of code (updating the product) is correct.
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