On Sun, 2007-07-15 at 20:07 +0200, Christian Joergensen wrote:
> Hi
>
> I am working on defining my own CurrencyField for newforms. The idea is
> to store the value (amount) in the DB by the smallest unit as an
> IntegerField. That is:
>
> 1,450.75 => 145075
>
> The clean method will happily clean the incoming strings into the right
> amount formatted as an integer:
>
> In [2]: f = CurrencyField()
>
> In [3]: f.clean("1,450.75")
> Out[3]: 145075
>
> My problem is when I need to present a bound form to the user. I do a
> check to see if the value to be cleaned is some sort of int. If so - I
> convert it to my special value, CurrencyValue.
>
> As I read the source, the widget will apply smart_unicode (from
> django.newforms.util) to the value given, thus I implemented a
> __unicode__ method in CurrencyValue (and had it extend StrAndUnicode
> (from django.newforms.util)).
>
> However it seems as the data attribute of the BoundField gives me a raw
> python int:
>
> In [30]: bf = BoundField(f, field, 'price')
>
> In [31]: unicode(bf)
> Out[31]: u'<input type="text" name="price" value="1495" id="id_price" />'
>
> In [32]: bf.data
> Out[32]: 1495
>
> In [33]: type(bf.data)
> Out[33]: <type 'int'>
>
> I can see (by inserting some print-commands in the clean() method) that
> the clean() method has been activated - and indeed returns at line 43.
>
> Looking at my code - I can't see how the clean() method should be able
> to return an int? It will return either a CurrencyValue or None.
>
> In short - why doesn't Out[31] give me value="14.95"?
I know you've chosen to go another way with this (and I agree that
DecimalField is probably an easier approach), but here's an answer to
the original question for the archives:
The output in out[31] is produced by the respective widget's render()
method. That method is passed, amongst other things, the initial value
of the field, which is taken from field.initial. Now, field.initial in
your case, is, I would guess, a simple Python integer. So that is the
object that is converted to Unicode, not your Field subclass. If you
want to create a custom output like this, you would need to subclass the
Widget class (probably newforms.TextInput in this case) and write your
own render() method to do the correct formatting.
Regards,
Malcolm
--
If Barbie is so popular, why do you have to buy her friends?
http://www.pointy-stick.com/blog/
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