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RequiredNullBooleanField

Author:
wwu.housing
Posted:
March 24, 2009
Language:
Python
Version:
1.0
Tags:
required boolean bool boolean-field null-boolean-field
Score:
3 (after 3 ratings)

In our situation, we want the user to choose either yes or no. The only requirement is that they fill out the form. It is not required that they answer True/Yes.

The BooleanField treats None and False as False; The NullBooleanField distinguishes between None and False, but it doesn't raise any validation errors.

Subclassing the NullBooleanField was better than overriding the clean method on all of our NullBooleanField instances.

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# fields.py
from django import forms

class RequiredNullBooleanField(forms.NullBooleanField):
    def clean(self, value):
        value = super(RequiredNullBooleanField, self).clean(value)
        if value is None:
            raise forms.ValidationError("This field is required.")
        return value


# forms.py
from django import forms
from project.fields import RequiredNullBooleanField

class MyForm(forms.Form):
    question = RequiredNullBooleanField(label="Have you ever travelled in an airplane?", 
                                        widget=forms.RadioSelect(choices=[(True, "Yes"), (False, "No")]))

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