Re: Ignoring empty forms in a formset

On Sun, Apr 22, 2012 at 5:44 PM, Martin Tiršel <martin.tirsel@gmail.com> wrote:
> Hello,
>
> I have a formset and some JavaScript to add more forms into this formset. In
> a view, I iterate through the formset saving (not a ModelForm just Form with
> save method) each form:
>
> for form in formset:
>     form.save()
>
> But I want to ignore empty forms that were added by JavasScript and not
> removed. How can I do this?
>
> Thanks,
> Martin
>

You don't show much of your code, but I presume you have called
formset.is_valid() at this point?

If so, this pattern is pretty canonical:

if formset.is_valid():
for form in formset:
if form.is_valid() and not form.empty_permitted:
form.save()

Extra forms in a formset are all instantiated with empty_permitted=True.

There are other things to be aware of though. This logic will not take
into account deleted forms etc, which is why there is a
BaseModelFormSet with the right behaviour baked into it's save()
method.

Cheers

Tom

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