let mut pager = staff::Entity::load()
        .with(staff::Relation::ReportsTo)
        .order_by_asc(staff::COLUMN.id)
        .paginate(db, 2);

    let staff = pager.fetch_and_next().await?.unwrap();

    assert_eq!(staff[0].name, "Alan");
    assert_eq!(staff[0].reports_to, None);

    assert_eq!(staff[1].name, "Ben");
    assert_eq!(staff[1].reports_to.as_ref().unwrap().name, "Alan");