BaseInlineFormSetthat demonstrates how you can require a user to enter at least one entry in an inline formset.
After updating to wadofstuff.django.forms 1.1.0 you can use the
RequireOneFormSetclass as the
When the formset is validated and it does not contain one or more entries, then a
ValidationErroris raised which gets put into
formset.non_form_errors. You will need to check this in your templates if you wish to display the error message to your users.