use new spawn api

src/keys.rs

@@ -28,24 +28,23 @@ fn on_spawn_key(trigger: Trigger<KeySpawn>, mut commands: Commands, assets: Res<
     let angle = rand::random::<f32>() * PI * 2.;
     let spawn_dir = Quat::from_rotation_y(angle) * Vec3::new(0.5, 0.6, 0.).normalize();
 
-    commands
-        .spawn((
-            Name::new("key"),
-            Key(id.clone()),
-            Transform::from_translation(*position),
-            Visibility::default(),
-            Collider::sphere(1.5),
-            ExternalImpulse::new(spawn_dir * 180.).with_persistence(false),
-            LockedAxes::ROTATION_LOCKED,
-            RigidBody::Dynamic,
-            CollisionEventsEnabled,
-            Restitution::new(0.6),
-        ))
-        .with_child((
+    commands.spawn((
+        Name::new("key"),
+        Key(id.clone()),
+        Transform::from_translation(*position),
+        Visibility::default(),
+        Collider::sphere(1.5),
+        ExternalImpulse::new(spawn_dir * 180.).with_persistence(false),
+        LockedAxes::ROTATION_LOCKED,
+        RigidBody::Dynamic,
+        CollisionEventsEnabled,
+        Restitution::new(0.6),
+        Children::spawn(Spawn((
             Billboard,
             SquishAnimation(2.6),
             SceneRoot(assets.mesh_key.clone()),
-        ));
+        ))),
+    ));
 }
 
 fn collect_key(