Method _test_collection

src/marshmallow/fields.py:632–635

(self, value: typing.Any)

        return schema.dump(nested_obj, many=many)

    def _test_collection(self, value: typing.Any) -> None:
        many = self.schema.many or self.many
        if many and not utils.is_collection(value):
            raise self.make_error("type", input=value, type=value.__class__.__name__)

    def _load(
        self,