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("displayName", self.display_name)
        writer.write_str_value("entityType", self.entity_type)
        writer.write_str_value("mailNickname", self.mail_nickname)
        writer.write_uuid_value("onBehalfOfUserId", self.on_behalf_of_user_id)
        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/devices/validate_properties/validate_properties_post_request_body.py