seems like despawn also despawn children?

[alexniver]

I'm not sure is this a bug or I'm doing something wrong

use bevy::{prelude::*, window::close_on_esc};
use bevy_inspector_egui::quick::WorldInspectorPlugin;

fn main() {
    App::new()
        .add_plugins((DefaultPlugins, WorldInspectorPlugin::new()))
        .add_systems(Update, (close_on_esc, spawn_p_c, despawn_p_only))
        .run();
}

#[derive(Debug, Component)]
struct P;

#[derive(Debug, Component)]
struct C;

fn spawn_p_c(mut commands: Commands, input: ResMut<Input<KeyCode>>) {
    if input.just_pressed(KeyCode::S) {
        commands.spawn(P).with_children(|c| {
            c.spawn(C);
        });
    }
}

fn despawn_p_only(
    mut commands: Commands,
    query: Query<Entity, With<P>>,
    input: ResMut<Input<KeyCode>>,
) {
    if input.just_pressed(KeyCode::D) {
        for p_entity in &query {
            commands.entity(p_entity).despawn();
        }
    }
}

I want just despawn P, but it's children 'C' also despawn.

bevy version : 0.12.1

[rparrett]

I think this is more likely to be an issue with bevy_inspector_egui. Could you try removing that plugin from your example and seeing if the behavior is the same?

[SkiFire13]

When you despawn the entities with the P component you don't fixup the Parent component of their children, which remains there pointing now invalid entities. Then bevy_inspector_egui shows only entities without a Parent component, which filters out your entities with a C component.

Consider calling .clear_children() before .despawn():

        for p_entity in &query {
-            commands.entity(p_entity).despawn();
+            commands.entity(p_entity).clear_children().despawn();
        }

[alexniver]

Yeah! you are right!