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? :)
Thanks a lot for your help!
Julien
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