Malcom,
This seems so obvious, I'm working on an invoice system and already passed the
chapter on rounding decimals. I still am somewhat overwhelmed I guess by all
that Django does. Nevertheless, it's impressive how good Django keeps to
(python) conventions.
Thanx a lot.
Regards,
Gerard.
Malcolm Tredinnick wrote:
>
> On Sat, 2008-09-27 at 18:07 +0200, Gerard Petersen wrote:
>> Dear Django team,
>>
>> It seems, but since I'm human it could be me, that in a modelform with a
>> forms.DecimalField declaration the min_value is not picked up when it has
>> decimals in it. The snippet:
>>
>> per_price = forms.DecimalField(
>> label='Per Price',
>> min_value=0.01,
>> decimal_places=2
>> )
>>
>> I want to force a 'value > 0'. A value of '1' works but that defies the
>> purpose of having 2 decimal_places. Note: a value of 0.01 for "initial=.."
>> does work.
>
> It's kind of a small inconsistency that a float is allowed for an
> initial value there. The fact is, this is a DecimalField, so using
> floats is something you should avoid doing. In Python, the following
> holds:
>
> >>> Decimal('0.05') < 0.1
> False
>
> In other words, decimals and floats do not compare as you might expect
> (since you cannot reliably convert a float to an exact decimal value).
>
> Instead, you should be passing in a Decimal instance for the minimum
> value:
>
> min_val = Decimal('0.01')
>
> and then it will work. Internally, Django has already converted the
> input value to a Decimal instance and is then using '<' and '>' to
> compare against min_value and max_value, so it needs to be comparing
> similar types.
>
> Regards,
> Malcolm
>
>
>
> >
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