My form's is_valid method returns false

user63835 Published at Dev

user63835

I have a form as below :

class CookDuty(forms.Form ):
    # cook = None
    def __init__(self, *args, **kwargs):
        cook = kwargs.pop('cook')
        super(CookDuty, self).__init__(*args, **kwargs)
        self.fields['duty'].choices = foods_for_cook(cook)
    duty = forms.ChoiceField(widget=forms.CheckboxSelectMultiple, required=False)

I have used it in a view as below, but form.is_valid returns false! I have checked form.errors and it's empty, form.data is empty, and form.is_bound is False.

def duty_list_cook(request):
    if request.method == 'POST':
        c = Cook.objects.all()[0]
        form = CookDuty(cook=c)
        if form.is_valid():
            print(form.cleaned_data)
            return render(request, 'employee/cook_duty.html', {'form':form})

    else:
        c = Cook.objects.all()[0]
        form = CookDuty(cook=c)
    return render (request, 'employee/cook_duty.html', {'form':form})

Alasdair

When it is a post request, you need to pass the POST data to the form.

if request.method == 'POST':
    c = Cook.objects.all()[0]
    form = CookDuty(cook=c, data=request.POST)

Without the post data, the form is unbound, so will always be invalid.

See the docs on bound and unbound forms for more info.

The second problem is that the ChoiceField field (used for selecting a single choice) isn't compatible with the CheckboxSelectMultiple widget (used for selecting multiple choices). If you want to select multiple choices, then you need to use MultipleChoiceField instead of ChoiceField.

duty = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple, required=False)

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Please contact [email protected] to delete if infringement.

edited at2021-03-3

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