On 12/23/07, Julien <[EMAIL PROTECTED]> wrote:
>
> Hi there,
>
> I don't understand why the form doesn't validate when I don't fill out
> a ManyToManyField.
>
> Here's the code:
>
> class Participant(models.Model):
> project = models.ForeignKey(Project, related_name='participants')
> roles = models.ManyToManyField(Role, blank=True, null=True)
> user = models.ForeignKey(User)
>
> class EditParticipantForm(forms.ModelForm):
> roles =
> forms.MultipleChoiceField(widget=TableSelectMultiple(item_attrs=('name',)))
> def __init__(self, *args, **kwargs):
> super(EditParticipantForm, self).__init__(*args, **kwargs)
> self.fields['roles'].choices = [(role.pk, role) for role in
> Role.objects.all()]
> class Meta:
> model = Participant
> fields = ('roles',)
>
>
> (The custom widget TableSelectMultiple is taken from there:
> http://www.djangosnippets.org/snippets/518/)
>
> If I don't select any option for 'roles' I get the error 'This field
> is required'.
> Yet, the doc says that the form field shouldn't be required if the
> corresponding model field has 'blank=True':
> http://www.djangoproject.com/documentation/modelforms/#field-types
>
> Is that a bug or is there a sensible explanation? :)
You are overriding the default field for 'roles' that the ModelForm
would generate, so you'll need to mark your custom one as
required=False. ModelForm will not magically change any custom fields
you define.
Joseph
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