Macro related

macro_rules! related {
    ($relationship_target:ty [$($child:expr),*$(,)?]) => { ... };
}

Returns a SpawnRelatedBundle that will insert the given RelationshipTarget, spawn a SpawnableList of entities with given bundles that relate to the RelationshipTarget entity via the RelationshipTarget::Relationship component, and reserve space in the RelationshipTarget for each spawned entity.

The first argument is the RelationshipTarget type. Any additional arguments will be interpreted as bundles to be spawned.

Also see children for a Children-specific equivalent.

let mut world = World::new();
world.spawn((
    Name::new("Root"),
    related!(Children[
        Name::new("Child1"),
        (
            Name::new("Child2"),
            related!(Children[
                Name::new("Grandchild"),
            ])
        )
    ])
));