Hi Scot,
On 11/05/2014 12:11 PM, Scot Hacker wrote:
> I'm having a strange issue with a pair of ManyToManyFields, where
> they're acting like they're required fields in the admin even though
> they're not.
>
>
> # In models.py
> |
> instructors =models.ManyToManyField(Instructor,blank=True)
> students =models.ManyToManyField(Profile,blank=True)
>
> |
>
>
> I can update an instance of this model with no instructors or students
> from the CLI just fine. The fields are not required. But I'm using
> ModelMultipleChoiceField in the admin:
>
>
> # In admin.py
> |
> classOfferingAdminForm(forms.ModelForm):
>
> instructors =forms.ModelMultipleChoiceField(
> widget
> =widgets.FilteredSelectMultiple('Instructors',is_stacked=False),
> queryset =Instructor.objects.all())
>
>
> students =forms.ModelMultipleChoiceField(
> widget =widgets.FilteredSelectMultiple('Students',is_stacked=False),
> queryset =User.objects.filter(is_active=True))
> |
>
> and when I try to save via the admin, it tells me these fields are
> required. If I tweak it to not use this ModelForm, I can save without
> instructors or students just fine.
When you override a field in a ModelForm, you lose the ability for it to
automatically pick up configuration from the model field. Either the
field is auto-created by the ModelForm based on your model field, or it
is created manually by you; it can't be both.
So because you are manually creating your `instructors` and `students`
fields on the form, the `blank=True` in the model has no effect; you
need to pass `required=False` to your two form fields.
(Because of this, I frequently choose to update/tweak form fields in an
overridden `__init__` method of a ModelForm, rather than overriding the
fields entirely.)
Carl
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