bevy_121 0.1.1

One-to-one relationships for Bevy ECS
Documentation 
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//! Demonstrates a simple example where each contributor can only work on one project at a time, and
//! each project can only be worked on by one contributor at a time.

use bevy_121::AsymmetricOneToOne;
use bevy_ecs::prelude::*;

fn main() {
    let mut world = World::new();
    let alice = world.spawn(()).id();
    let cart = world.spawn(()).id();
    let bsn = world.spawn(Assignee(alice)).id();
    // Alice is in over her head, have Cart take over
    world.entity_mut(cart).insert(Assignment(bsn));
    assert_eq!(world.entity(bsn).get::<Assignee>().unwrap().0, cart);
    // Cart finished the assignment, time to clean up.
    world.despawn(bsn);
    assert!(world.entity(cart).get::<Assignment>().is_none());
}

#[derive(AsymmetricOneToOne)]
#[target(Assignee)]
struct Assignment(Entity);

#[derive(AsymmetricOneToOne)]
#[target(Assignment)]
struct Assignee(Entity);