Hello,

I have got a class Person:

class Person(models.Model):
    given_names = models.CharField(max_length=200)
    family_names = models.CharField(max_length=200)
    date_of_birth = models.DateField(blank=True)

and a class PersonForm:

class PersonForm(forms.ModelForm):

    def clean_date_of_birth(self):
        try:
            date_of_birth = self.cleaned_data['date_of_birth']
            if date_of_birth.year < 1890:
                raise forms.ValidationError(u"It is very improbable
for a person to be this old.")
            return date_of_birth
        except KeyError:
            pass

The code works as expected if I leave out "blank=True" in the field
date_of_birth of the class Person. But it doesn't work with
blank=True.

How does clean_date_of_birth have to look like, if date_of_birth is
optional?

Jaroslav

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