Formset Functions Formset API reference. For introductory material about formsets, see the Formsets topic guide. formset_factory formset_factory(form, formset=BaseFormSet, extra=1, can_order=False, can_delete=False, max_num=None, validate_max=False, min_num=None, validate_min=False)[source] Returns a FormSet class for the given form class. See formsets for example usage.