validate delete inline formset django
class RequiredImageInlineFormset(forms.models.BaseInlineFormSet): """ Makes inline fields required """ def clean(self): # get forms that actually have valid data count = 0 delete_checked = 0 for form in self.forms: try: if form.cleaned_data: count += 1 if form.cleaned_data['DELETE']: delete_checked += 1 if not form.cleaned_data['DELETE']: delete_checked -= 1 except AttributeError: # annoyingly, if a subform is invalid Django explicity raises # an AttributeError for cleaned_data pass # Case no images uploaded if count < 1: raise forms.ValidationError( 'At least one image is required.') # Case one image added and another deleted if delete_checked > 0 and ProductImage.objects.filter(product=self.instance).count() == 1: raise forms.ValidationError( "At least one image is required.")
