Django ChoicesField divider?

Question

I'm using a ChoicesField in my form, but I want to put a divider in it like this:

COUNTRIES = (
    ('CA', _('Canada')),
    ('US', _('United States')),
    (None, _('---')), # <----------
    ('AF', _('Afghanistan')),
    ('AX', _('Aland Islands')),
    ('AL', _('Albania')),
    ('DZ', _('Algeria')),
    ('AS', _('American Samoa')),
    # ...

class AddressForm(forms.Form):
    country = forms.ChoiceField(choices=COUNTRIES, initial='CA')

What's the easiest way to make that unselectable, or at least give an error if the user picks it?

Answer 1

You could write a clean method to raise a validation error if any divider is selected.

class AddressForm(forms.Form):
  country = forms.ChoiceField(choices=COUNTRIES, initial='CA')

  def clean_country(self):
    data = self.cleaned_data["country"]
    if not data:
       raise forms.ValidationError("You must select a valid country.")
    return data