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ridoo avatar ridoo commented on July 29, 2024

My observation is rather that TOTAL_FORMS counter is decremented on delete. See

forms = $('.' + options.formCssClass).not(':hidden');
totalForms.val(forms.length);

and

// Update the TOTAL_FORMS count:
forms = $('.' + options.formCssClass).not('.formset-custom-template');
totalForms.val(forms.length);

For what I traced in the Django code is, that the TOTAL_FORMS count has to include both visible and hidden form groups in the formset, as all form data is POSTed (deleted ones are marked with DELETE: "on" attribute). Decreasing the counter would not make the formset creating any (initial) forms for data having an index bigger than the decreased TOTAL_FORMS .

from django-dynamic-formset.

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