Django form validation: making “required” conditional?

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I'm new to Django (and Python), and am trying to figure out how to conditionalize certain aspects of form validation. In this case, there's a HTML interface to the application where the user can choose a date and a time from widgets. The clean method on the form object takes the values of the time and date fields and turns them back into a datetime.

In addition to the HTML interface, there's also an iPhone client making calls into the application, and I'd like to pass a UNIX timestamp-style time value in.

My form code looks like this:

class FooForm(forms.ModelForm):
    foo_date             = forms.CharField(required=True, widget=forms.RadioSelect(choices=DATE_CHOICES))
    foo_time             = forms.CharField(required=True, widget=SelectTimeWidget())
    foo_timestamp        = forms.CharField(required=False)

How do I make foo_date and foo_time required unless foo_timestamp is provided?

Aug 30, 2018 in Python by bug_seeker
• 14,970 points
572 views

1 answer to this question.

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This is done with the clean method on the form. You need to set foo_date and foo_time to required=False, though, because clean is only called after every field has been validated (see also the documentation).

class FooForm(forms.Form)
    # your field definitions

    def clean(self):
        data = self.cleaned_data
        if data.get('foo_timestamp', None) or (data.get('foo_date', None) and data.get('foo_time', None)):
            return data
        else:
            raise forms.ValidationError('Provide either a date and time or a timestamp')
answered Aug 30, 2018 by Priyaj
• 56,120 points

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