fn into_request_enum(self) -> crate::Request {

        crate::Request::PrioId(self.prio, self.songids)

    }

    fn from_request_enum(request: crate::Request) -> Option<Self> {

        match request {

            crate::Request::PrioId(prio, songids) => Some(PrioIdRequest { prio, songids }),

            _ => None,

    }

    fn serialize(&self) -> String {

        let songids = self

            .songids

            .iter()

            .map(|id| id.to_string())

            .collect::<Vec<String>>()

            .join(",");

        format!("{} {} {}\n", Self::COMMAND, self.prio, songids)

    }

    fn parse(mut parts: RequestTokenizer<'_>) -> Result<Self, RequestParserError> {

        let prio = parts.next().ok_or(Self::missing_arguments_error(0))?;

        let prio = prio

            .parse()

            .map_err(|_| RequestParserError::SubtypeParserError {

                raw_input: prio.to_string(),

            })?;

        let songids = parts.next().ok_or(Self::missing_arguments_error(1))?;

        let songids = songids

            .split(',')

            .map(|s| {

                s.parse()

                    .map_err(|_| RequestParserError::SyntaxError(0, s.to_string()))

            })

            .collect::<Result<Vec<SongId>, RequestParserError>>()?;

        Self::throw_if_too_many_arguments(parts)?;

        Ok(PrioIdRequest { prio, songids })

    }