When I inherit my own GDExtension class, editor can no longer see the inheriting class

Question

I had two classes in my game, Player and ShootableObject. Both set up as such:

class Player : public RigidBody2D { private: GDCLASS(Player, RigidBody2D); ... implementation follows ...

class ShootableObject : public RigidBody2D { private: GDCLASS(ShootableObject , RigidBody2D); ... implementation follows ...

And registered as such in my module:

void initialize_example_module(godot::ModuleInitializationLevel p_level) { if (p_level != godot::MODULE_INITIALIZATION_LEVEL_SCENE) { return; } godot::ClassDB::register_class<godot::Player>(); godot::ClassDB::register_class<godot::ShootableObject>(); }

I wanted to extract some common behavior from the two and created a third class, as such:

class GravityBody2D : public RigidBody2D { private: GDCLASS(GravityBody2D, RigidBody2D);

I then changed the inheritance of the other two:

class Player : public GravityBody2D { private: GDCLASS(Player, GravityBody2D); ... implementation follows ...

And added it to the exports:

void initialize_example_module(godot::ModuleInitializationLevel p_level) { if (p_level != godot::MODULE_INITIALIZATION_LEVEL_SCENE) { return; } godot::ClassDB::register_class<godot::Player>(); godot::ClassDB::register_class<godot::ShootableObject>(); godot::ClassDB::register_class<godot::GravityBody2D>(); }

I now get an error that the classes are not found:

 Cannot get class 'Player'. Cannot get class 'ShootableObject'. Cannot get class 'ShootableObject'.

I can however see GravityBody2D in the node list:

How can I inherit my own class?

Does the order of registration matter? Do you get different results if you register the base class before the derived classes? — DMGregory
– DMGregory ♦, Commented Nov 5, 2023 at 12:23
@DMGregory Just like you said, as I just found out while at my wits end. It makes little sense to me as if I were implementing such system, I'd collect metadata first and turn it into a tree later. I would also probably print a message if I was missing something, like a parent declaration. — Tomáš Zato
– Tomáš Zato, Commented Nov 5, 2023 at 12:39

Tomáš Zato · Accepted Answer · 2023-11-05 12:39:51Z

The order of registration matters, the parent classes MUST be registered first. Correct order in this example:

void initialize_example_module(godot::ModuleInitializationLevel p_level) { if (p_level != godot::MODULE_INITIALIZATION_LEVEL_SCENE) { return; } godot::ClassDB::register_class<godot::GravityBody2D>(); godot::ClassDB::register_class<godot::Player>(); godot::ClassDB::register_class<godot::ShootableObject>(); }

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