def serialize(self,writer: SerializationWriter) -> None:
        """
        Serializes information the current object
        param writer: Serialization writer to use to serialize this model
        Returns: None
        """
        if writer is None:
            raise TypeError("writer cannot be null.")
        writer.write_str_value("expression", self.expression)
        writer.write_object_value("targetAttributeDefinition", self.target_attribute_definition)
        writer.write_object_value("testInputObject", self.test_input_object)
        writer.write_additional_data_value(self.additional_data)

        Serializes information the current object
        param writer: Serialization writer to use to serialize this model
        Returns: None
        
msgraph/generated/applications/item/synchronization/templates/item/schema/parse_expression/parse_expression_post_request_body.py