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Fix push_children
inserting a Children
component even when no children are supplied (#14109)
# Objective The Bevy API around manipulating hierarchies removes `Children` if the operation results in an entity having no children. This means that `Children` is guaranteed to hold actual children. However, the following code unexpectedly inserts empty `Children`: ```rust commands.entity(entity).with_children(|_| {}); ``` This was discovered by @Jondolf: https://discord.com/channels/691052431525675048/1124043933886976171/1257660865625325800 ## Solution - `with_children` is now a noop when no children were passed ## Testing - Added a regression test
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@ -584,6 +584,10 @@ impl BuildChildren for EntityWorldMut<'_> {
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}
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fn push_children(&mut self, children: &[Entity]) -> &mut Self {
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if children.is_empty() {
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return self;
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}
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let parent = self.id();
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if children.contains(&parent) {
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panic!("Cannot push entity as a child of itself.");
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@ -1214,4 +1218,14 @@ mod tests {
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let children = query.get(&world, parent).unwrap();
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assert_eq!(**children, [child]);
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}
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#[test]
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fn push_children_does_not_insert_empty_children() {
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let mut world = World::new();
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let parent = world.spawn_empty().push_children(&[]).id();
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let mut query = world.query::<&Children>();
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let children = query.get(&world, parent);
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assert!(children.is_err());
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}
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}
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