)
        else:
            self.response_field = None  # type: ignore  # ty: ignore[unused-ignore-comment]
        if self.stream_item_type:
            stream_item_name = "StreamItem_" + self.unique_id
            self.stream_item_field: ModelField | None = create_model_field(
                name=stream_item_name,
                type_=self.stream_item_type,
                mode="serialization",