* Cédric Krier [2011-05-12 11:05 +0200]:
On 12/05/11 10:30 +0200, Nicolas Évrard wrote:
* Cédric Krier [2011-05-12 10:13 +0200]:
>On 12/05/11 09:45 +0200, Paul J Stevens wrote:
>>This makes me wonder if perhaps the whole required state machinery needs
>>to be able to allow zero values on numeric fields to satisfy the
>>requirement. I'm well aware of where this comes from: in python numeric
>>values of zero evaluate to False. However, is a business context an
>>explicit zero-amount is *not* the same as an unspecified amount, or in
>>other words: 0 is not False, only False is False.
>
>Have you ideas about how we could be sure to not have zero-amount per error?
You can have a sql constraint and a boolean field.
Having a checkbox if checked it allow zero amount as unit price.
Like that the user should explicitly says that he want a zero amount price.
That's what I said.
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