This may be better suited for django-users, as it's somewhat a usage
question, but it's for DurationField, which is a proposed addition to
Django itself, and its solution may (I don't know yet, just guessing)
involve some slight code changes.

I'm planning to implement a SplitDurationField, based loosely on
SplitDateTimeField, using MultiValueField as its base. However, when
entering durations, it seems reasonable to allow users to enter just
some of the values, whiel leaving others blank, with the blank values
defaulting to 0 internally.

I'd like to allow this option, while requiring that at least one of
the fields be filled in, but I don't see a way to get MultiValueField
to do so. So I see three possible outcomes:

(1) I'm missing something, and you guys can help me out.
(2) I should just leave it as is, and document the fact that unused
values need a 0 explicitly entered.
(3) I should investigate what code fixes might be necessary to
facilitate this option.

I did a bit of work on (3) and the rabbit hole goes far deeper than
I'd like, so I'm hoping it's (1). If it's (2) though, that's okay too.

-Gul


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