Django Formset.is_valid() failing for extra forms

Question

In my Django application application I have a formset that is created from a simple (not-model) form, with the extra=1 (to allow javasript to add more forms later on).

Answer 1

Thanks Carl, you led me to discover the root of my problem.

When creating a form with a choice field, which is required, we must set an initial value, otherwise the form will consider that field changed.

So for a form like this:

class SomeForm(forms.Form):

    A = 0
    B = 1
    C = 2
    D = 3

   choices = ((A, 'Aah'), (B, 'Baa'), (C, 'Caa'), (D, 'Daa'))

    # This is a required choice field
    pickme = forms.ChoiceField(choices=choices)

we do this:

pickme = forms.ChoiceField(choices=choices, initial=A)

Then when a formset checks the extra form it will see that pickme had an initial value of A, and it is A now as well, and will consider it unchanged.