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  • use ruma::api::client::relations::{
        get_relating_events, get_relating_events_with_rel_type,
        get_relating_events_with_rel_type_and_event_type,
    };
    
    use crate::{service::rooms::timeline::PduCount, services, Result, Ruma};
    
    /// # `GET /_matrix/client/r0/rooms/{roomId}/relations/{eventId}/{relType}/{eventType}`
    pub async fn get_relating_events_with_rel_type_and_event_type_route(
        body: Ruma<get_relating_events_with_rel_type_and_event_type::v1::Request>,
    ) -> Result<get_relating_events_with_rel_type_and_event_type::v1::Response> {
        let sender_user = body.sender_user.as_ref().expect("user is authenticated");
    
        let from = match body.from.clone() {
            Some(from) => PduCount::try_from_string(&from)?,
            None => match ruma::api::Direction::Backward {
                // TODO: fix ruma so `body.dir` exists
                ruma::api::Direction::Forward => PduCount::min(),
                ruma::api::Direction::Backward => PduCount::max(),
            },
        };
    
        let to = body
            .to
            .as_ref()
            .and_then(|t| PduCount::try_from_string(&t).ok());
    
        // Use limit or else 10, with maximum 100
        let limit = body
            .limit
            .and_then(|u| u32::try_from(u).ok())
            .map_or(10_usize, |u| u as usize)
            .min(100);
    
        let res = services()
            .rooms
            .pdu_metadata
            .paginate_relations_with_filter(
                sender_user,
                &body.room_id,
                &body.event_id,
                Some(body.event_type.clone()),
                Some(body.rel_type.clone()),
                from,
                to,
                limit,
            )?;
    
        Ok(
            get_relating_events_with_rel_type_and_event_type::v1::Response {
                chunk: res.chunk,
                next_batch: res.next_batch,
                prev_batch: res.prev_batch,
            },
        )
    }
    
    /// # `GET /_matrix/client/r0/rooms/{roomId}/relations/{eventId}/{relType}`
    pub async fn get_relating_events_with_rel_type_route(
        body: Ruma<get_relating_events_with_rel_type::v1::Request>,
    ) -> Result<get_relating_events_with_rel_type::v1::Response> {
        let sender_user = body.sender_user.as_ref().expect("user is authenticated");
    
        let from = match body.from.clone() {
            Some(from) => PduCount::try_from_string(&from)?,
            None => match ruma::api::Direction::Backward {
                // TODO: fix ruma so `body.dir` exists
                ruma::api::Direction::Forward => PduCount::min(),
                ruma::api::Direction::Backward => PduCount::max(),
            },
        };
    
        let to = body
            .to
            .as_ref()
            .and_then(|t| PduCount::try_from_string(&t).ok());
    
        // Use limit or else 10, with maximum 100
        let limit = body
            .limit
            .and_then(|u| u32::try_from(u).ok())
            .map_or(10_usize, |u| u as usize)
            .min(100);
    
        let res = services()
            .rooms
            .pdu_metadata
            .paginate_relations_with_filter(
                sender_user,
                &body.room_id,
                &body.event_id,
                None,
                Some(body.rel_type.clone()),
                from,
                to,
                limit,
            )?;
    
        Ok(get_relating_events_with_rel_type::v1::Response {
            chunk: res.chunk,
            next_batch: res.next_batch,
            prev_batch: res.prev_batch,
        })
    }
    
    /// # `GET /_matrix/client/r0/rooms/{roomId}/relations/{eventId}`
    
    pub async fn get_relating_events_route(
    
        body: Ruma<get_relating_events::v1::Request>,
    ) -> Result<get_relating_events::v1::Response> {
    
        let sender_user = body.sender_user.as_ref().expect("user is authenticated");
    
    
        let from = match body.from.clone() {
            Some(from) => PduCount::try_from_string(&from)?,
            None => match ruma::api::Direction::Backward {
                // TODO: fix ruma so `body.dir` exists
                ruma::api::Direction::Forward => PduCount::min(),
                ruma::api::Direction::Backward => PduCount::max(),
            },
        };
    
        let to = body
            .to
            .as_ref()
            .and_then(|t| PduCount::try_from_string(&t).ok());
    
        // Use limit or else 10, with maximum 100
        let limit = body
            .limit
            .and_then(|u| u32::try_from(u).ok())
            .map_or(10_usize, |u| u as usize)
            .min(100);
    
        services()
            .rooms
            .pdu_metadata
            .paginate_relations_with_filter(
                sender_user,
                &body.room_id,
                &body.event_id,
                None,
                None,
                from,
                to,
                limit,
            )