Function find_one

examples/basic/src/select.rs:122–150

(db: &DbConn)

}

async fn find_one(db: &DbConn) -> Result<(), DbErr> {
    print!("find one by primary key: ");

    let cheese: Option<cake::Model> = Cake::find_by_id(1).one(db).await?;
    let cheese = cheese.unwrap();

    println!();
    println!("{cheese:?}");
    println!();

    print!("find one by name: ");

    let chocolate = Cake::find_by_name("chocolate").one(db).await?;

    println!();
    println!("{chocolate:?}");
    println!();

    print!("find models belong to: ");

    let fruits = cheese.find_related(Fruit).all(db).await?;

    println!();
    for ff in fruits.iter() {
        println!("{ff:?}\n");
    }

    Ok(())
}

async fn count_fruits_by_cake(db: &DbConn) -> Result<(), DbErr> {
    #[derive(Debug, FromQueryResult)]