Trait diesel_async::methods::LoadQueryGatWorkaround

pub trait LoadQueryGatWorkaround<'conn, 'query, Conn, U> {
    type LoadFuture: Future<Output = QueryResult<Self::Stream>> + Send;
    type Stream: Stream<Item = QueryResult<U>> + Send;
}

This trait is a workaround to emulate GAT on stable rust

It is used to specify the return type of LoadQuery::internal_load which may contain lifetimes

Required Associated Types

type LoadFuture: Future<Output = QueryResult<Self::Stream>> + Send

The future returned by LoadQuery::internal_load

type Stream: Stream<Item = QueryResult<U>> + Send

The inner stream returned by LoadQuery::internal_load

Implementors

impl<'conn, 'query, Conn, U, T, DB, ST> LoadQueryGatWorkaround<'conn, 'query, Conn, U> for Twhere
    Conn: AsyncConnection<Backend = DB>,
    U: Send,
    T: AsQuery + Send,
    T::SqlType: CompatibleType<U, DB, SqlType = ST>,
    U: FromSqlRow<ST, DB> + Send + 'static,
    DB: QueryMetadata<T::SqlType>,

type LoadFuture = MapOk<<Conn as AsyncConnectionGatWorkaround<'conn, 'query, DB>>::LoadFuture, fn(<Conn as AsyncConnectionGatWorkaround<'conn, 'query, DB>>::Stream) -> <T as LoadQueryGatWorkaround<'conn, 'query, Conn, U>>::Stream>

type Stream = Map<<Conn as AsyncConnectionGatWorkaround<'conn, 'query, DB>>::Stream, fn(Result<<Conn as AsyncConnectionGatWorkaround<'conn, 'query, DB>>::Row, Error>) -> Result<U, Error>>