formsets.py 文件源码

def add_fields(self, form, index):
        """A hook for adding extra fields on to each form instance."""
        if self.can_order:
            # Only pre-fill the ordering field for initial forms.
            if index is not None and index < self.initial_form_count():
                form.fields[ORDERING_FIELD_NAME] = IntegerField(label=_('Order'), initial=index + 1, required=False)
            else:
                form.fields[ORDERING_FIELD_NAME] = IntegerField(label=_('Order'), required=False)
        if self.can_delete:
            form.fields[DELETION_FIELD_NAME] = BooleanField(label=_('Delete'), required=False)