Struct WithOneRelated 

pub struct WithOneRelated(pub Entity);

A wrapper over an Entity indicating that an entity should be added. This is intended to be used for hierarchical spawning via traits like [SpawnableList] and SpawnRelated.

Unlike WithRelated this only adds one entity.

Also see the children and related macros that abstract over the [Spawn] API.

let mut world = World::new();

let child1 = world.spawn(Name::new("Child1")).id();

world.spawn((
    Name::new("Root"),
    Children::spawn((
        // This adds the already existing entity as a child of Root.
        WithOneRelated(child1),
    )),
));

Tuple Fields

0: Entity

Trait Implementations

impl<R> SpawnableList<R> for WithOneRelated

where R: Relationship,

fn spawn(this: MovingPtr<'_, WithOneRelated>, world: &mut World, entity: Entity)

Spawn this list of changes in a given World and relative to a given Entity. This is generally used for spawning “related” entities, such as children.

fn size_hint(&self) -> usize

Returns a size hint, which is used to reserve space for this list in a RelationshipTarget. This should be less than or equal to the actual size of the list. When in doubt, just use 0.