microrm 0.6.3

Lightweight ORM using sqlite as a backend
Documentation 
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use microrm::prelude::*;
use test_log::test;

mod common;

#[derive(Default, Entity)]
struct Base {
    name: String,
    targets: microrm::RelationMap<Target>,
}

#[derive(Default, Entity)]
struct Target {
    name: String,
    indirect_targets: microrm::RelationMap<IndirectTarget>,
}

#[derive(Default, Entity)]
struct IndirectTarget {
    name: String,
}

#[derive(Schema)]
struct JoinDB {
    bases: microrm::IDMap<Base>,
    targets: microrm::IDMap<Target>,
    indirect: microrm::IDMap<IndirectTarget>,
}

#[test]
fn simple_ops() {
    let (pool, db): (_, JoinDB) = common::open_test_db!();
    let mut txn = pool.start().unwrap();

    let b1id = db
        .bases
        .insert(
            &mut txn,
            Base {
                name: "base1".to_string(),
                targets: Default::default(),
            },
        )
        .expect("couldn't insert base");
    let b2id = db
        .bases
        .insert(
            &mut txn,
            Base {
                name: "base2".to_string(),
                targets: Default::default(),
            },
        )
        .expect("couldn't insert base");
    let _b3id = db
        .bases
        .insert(
            &mut txn,
            Base {
                name: "base3".to_string(),
                targets: Default::default(),
            },
        )
        .expect("couldn't insert base");

    let t1id = db
        .targets
        .insert(
            &mut txn,
            Target {
                name: "target1".to_string(),
                ..Default::default()
            },
        )
        .expect("couldn't insert target");
    let t2id = db
        .targets
        .insert(
            &mut txn,
            Target {
                name: "target2".to_string(),
                ..Default::default()
            },
        )
        .expect("couldn't insert target");
    let t3id = db
        .targets
        .insert(
            &mut txn,
            Target {
                name: "target3".to_string(),
                ..Default::default()
            },
        )
        .expect("couldn't insert target");

    let it1id = db
        .indirect
        .insert(
            &mut txn,
            IndirectTarget {
                name: "itarget1".to_string(),
                ..Default::default()
            },
        )
        .expect("couldn't insert target");
    let _it2id = db
        .indirect
        .insert(
            &mut txn,
            IndirectTarget {
                name: "itarget2".to_string(),
                ..Default::default()
            },
        )
        .expect("couldn't insert target");
    let _it3id = db
        .indirect
        .insert(
            &mut txn,
            IndirectTarget {
                name: "itarget3".to_string(),
                ..Default::default()
            },
        )
        .expect("couldn't insert target");

    log::trace!("looking up base by ID {:?}", b1id);

    let b1 = db
        .bases
        .by_id(&mut txn, b1id)
        .expect("couldn't get base")
        .expect("couldn't get base");
    b1.targets
        .connect_to(&mut txn, t1id)
        .expect("couldn't connect b1 to t1id");
    b1.targets
        .connect_to(&mut txn, t2id)
        .expect("couldn't connect b1 to t2id");

    let b2 = db
        .bases
        .by_id(&mut txn, b2id)
        .expect("couldn't get base")
        .expect("couldn't get base");
    b2.targets
        .connect_to(&mut txn, t2id)
        .expect("couldn't connect b2 to t2id");
    b2.targets
        .connect_to(&mut txn, t3id)
        .expect("couldn't connect b2 to t3id");

    let t1 = db
        .targets
        .by_id(&mut txn, t2id)
        .expect("couldn't get target")
        .expect("couldn't get target");
    t1.indirect_targets
        .connect_to(&mut txn, it1id)
        .expect("couldn't connect t1 to it1id");

    assert_eq!(
        db.bases
            .join(Base::Targets)
            .get(&mut txn)
            .expect("couldn't get joined results")
            .len(),
        3
    );

    let double_join = db
        .bases
        .join(Base::Targets)
        .join(Target::IndirectTargets)
        .get(&mut txn)
        .expect("couldn't get double-joined results");
    assert_eq!(double_join.len(), 1);

    let double_join_count = db
        .bases
        .join(Base::Targets)
        .join(Target::IndirectTargets)
        .count(&mut txn)
        .expect("couldn't count double-joined results");
    assert_eq!(double_join_count, 1);
}