AttributeError: 'NoneType' object has no attribute 'visible_fields'

Question

I'm trying to add a class to <input> on my form. Following the instructions of the first answer to this question, I added some code into my form's __init__ method. However I got the error displayed in the title.

forms.py

class SignupForm(UserCreationForm):
    email = forms.EmailField(max_length=200, help_text='Required')
    first_name = forms.CharField(max_length=30)
    last_name = forms.CharField(max_length=30)

    def __init__(self, *args, **kwargs):
        form = super(SignupForm, self).__init__(*args, **kwargs)
        for visible in form.visible_fields():
            visible.field.widget.attrs['class'] = 'form-control'

    class Meta:
        model = User
        fields = ('username', 'email', 'password1', 'password2', 'first_name', 'last_name',)

Alasdair · Accepted Answer · 2017-11-29 19:49:18Z

1

You get the error because the super() call returns None. Inside the __init__ method you can access the form's attributes with with self.

def __init__(self, *args, **kwargs):
    super(SignupForm, self).__init__(*args, **kwargs)
    for visible in self.visible_fields():
        ...

answered Nov 29, 2017 at 19:49

Alasdair

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