1418 destroy child entities when parent entities are destroyed

CHANGELOG.md

@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 - Entity destruction detection to observers (#1458, **@kuukitenshi**).
-
+- Destroy child entities when parent entities are destroyed (#1418, **@kuukitenshi**).
 
 ## [v0.6.0] - 2025-02-10
 

core/src/ecs/command_buffer.cpp

@@ -39,8 +39,8 @@ Entity CommandBuffer::create()
 void CommandBuffer::destroy(Entity entity)
 {
     std::lock_guard<std::mutex> lock(mMutex);
-
-    mCommands.emplace_back([entity](World& world) { world.destroy(entity); });
+    
+    mCommands.emplace_back([entity](World& world) { world.destroy(entity);});
 }
 
 std::unordered_map<std::string, Entity> CommandBuffer::spawn(const Blueprint& blueprint, bool withName)

engine/src/transform/plugin.cpp

@@ -68,6 +68,18 @@ void cubos::engine::transformPlugin(Cubos& cubos)
         .without<LocalToParent>()
         .call(addComponent<LocalToParent>);
 
+    cubos.observer("destroy childs when parent is destroyed")
+        .onDestroy(0)
+        .call([](Query<Entity> query, Query<Entity, const ChildOf&> children, Commands cmds) {
+            for (auto [entity] : query)
+            {
+                for (auto [child, childOf] : children.pin(1, entity))
+                {
+                    cmds.destroy(child);
+                }
+            }
+        });
+
     cubos.system("update LocalToParent's")
         .tagged(transformUpdateTag)
         .before(transformUpdatePropagateTag)