CODEWITHSUNDEEP
djangodjango-formsdjango-admin
Pawel Ceranka
Pawel Ceranka

Reputation: 461

I get "int() argument must be a string or a number, not 'list'"while using ModelChoiceField in ModelForm in Django

I want to be able to use ModelChoiceField in my form for my model in django admin. But while the default widget Select works when I customize and add 

class GalleryModelForm(forms.ModelForm):
    image = forms.ModelChoiceField(queryset=models.Photo.objects.all(),
                                   widget=forms.SelectMultiple, empty_label=None)
    class Meta:
        model = models.Gallery

I get 

int() argument must be a string or a number, not 'list'

from traceback:

/app/.heroku/python/lib/python2.7/site-packages/django/db/models/fields/__init__.py in get_prep_value

 def get_prep_value(self, value):
    if value is None:
        return None
    return int(value)

Is there any way to pass string or number to get_prep_value or to override it?

Upvotes: 0

Views: 909

Answers (1)

Ricola3D
Ricola3D

Reputation: 2442

You should use ModelMultipleChoiceField class instead of using a ModelChoiceField with setting a SelectMultiple widget I think.

And thus it would give you the following:

class GalleryModelForm(forms.ModelForm):
    image = forms.ModelMultipleChoiceField(queryset=models.Photo.objects.all(), empty_label=None)
    class Meta:
        model = models.Gallery

And then, just take care if the form is left empty, Django 1.5 will return an empty queryset, while older versions will return an empty list (ugly).

Upvotes: 2

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