On Fri, Feb 4, 2011 at 3:31 PM, Marc Aymerich <[email protected]> wrote:
> On Fri, Feb 4, 2011 at 12:12 PM, Tom Evans <[email protected]> wrote:
>> On Fri, Feb 4, 2011 at 11:07 AM, Marc Aymerich <[email protected]> wrote:
>>> Hi
>>> In some choices widgets I want to represent null values as u'No
>>> period' instead of u'--------'
>>>
>>> I try with:
>>>
>>> PERIOD_CHOICES = getattr(settings, 'PERIOD_CHOICES',
>>> ((None,
>>> ugettext('No Period')),
>>> (DAILY,
>>> ugettext('Daily')),
>>> (MONTHLY,
>>> ugettext('Monthly')),
>>> (ANUAL,
>>> ugettext('Anual')),
>>> ))
>>> period = models.CharField(max_length=1,
>>> choices=settings.PERIOD_CHOICES, null=True)
>>>
>>> But when I choose "No Period" I get this form validation error: Value
>>> u'None' is not a valid choice.
>>>
>>> Any idea?
>>> Thanks!
>>
>> form.Field doesn't take null as an option, you want required[1]:
>>
>> """
>> By default, each Field class assumes the value is required, so if you
>> pass an empty value -- either None or the empty string ("") -- then
>> clean() will raise a ValidationError exception:
>> """
>>
>> Cheers
>>
>> Tom
>>
>> [1] http://docs.djangoproject.com/en/1.2/ref/forms/fields/#required
>
>
> Hi Tom,
> I override the default admin form with this:
>
> class MonitorAdminForm(ModelForm):
> class Meta:
> model = Monitor
> period = forms.ChoiceField(required=False, choices =
> settings.PERIOD_CHOICES)
>
> Now period has required=False but still raise the validation error:
> Value u'None' is not a valid choice.
>
> What is strange for me is although I put the None value on
> PERIOD_CHOICES the error seems to say that None is interpreted as a
> unicode instead of None. Maybe this is the point, if it's, how can I
> declare a null value in PERIOD_CHOICES definition ?
>
Just I found the solution looking for others things :)
help(admin.ModelAdmin)
get_action_choices(self, request, default_choices=[('', '---------')])
On forms the null value is ''
Thanks!
--
Marc
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