Aery

Non-fragmenting (slight misnomer) ZST relations for Bevy.

```rust use bevy::prelude::; use aery::prelude::;

fn main() { App::new() .addplugin(Aery) .addstartupsystem(setup) .addsystem(sys) .run(); }

[derive(Component)]

struct Foo;

[derive(Component)]

struct Bar;

[derive(Relation)]

struct R0;

[derive(Relation)]

[cleanup(policy = "Recursive")]

struct R1;

fn setup(mut commands: Commands) { let (root, foo0, foo1, bar0, bar1) = ( commands.spawn(Foo).id(), commands.spawn(Foo).id(), commands.spawn(Foo).id(), commands.spawn(Bar).id(), commands.spawn(Bar).id(), );

commands.set::<R0>(foo0, bar0);
commands.set::<R0>(foo1, bar1);
commands.set::<R1>(foo0, root);
commands.set::<R1>(foo1, root);

}

fn sys( foos: Query<(&Foo, Relations<(R0, R1)>)>, bars: Query<&Bar>, r1roots: Query> ) { foos.ops() .join::(&bars) .breadthfirst::(r1roots.iter()) .foreach(|foo_ancestor, foo, bar| { // .. }) } ```

What is supported:

• ZST relations
• Fragmenting on (relation) type
• Declarative joining & traversing
• Explicit despawn cleanup

What is not supported:

• Fragmenting on target
• Target querying
• Implicit despawn cleanup

Version table

| Bevy version | Aery verison | |--------------|--------------| | 0.10 | 0.1 - 0.2 |