function
world_attach_dyn
world_attach_dyn(target, property)
world_attach_dyn adds a property to a live instance by numeric id, the reflection-ABI counterpart of the static attach Prop on instance. It is the tool a mod uses to grant a runtime-registered property (from world_register_prop) — or any property known only by id — to an instance, after which the instance's fields can be written with world_set. It returns nothing and sets the instance's has-flag for that property. Pair it with world_detach_dyn to remove. In ordinary compiled code, prefer the attach statement, which also fires @OnAttach hooks and seeds field overrides.
Parameters
targetthe model instance to modify, an entity handlepropertythe property id to attach, from world_prop_id or world_register_propExample
program GrantComponent {
property Position { column: int = 0, row: int = 0 }
model Player { Position }
handler Boot phase Start {
spawn Hero { Position { column: 4, row: 4 } }
let stamina_property = world_register_prop("Stamina", 1)
for (position) in query [Position, {Player}] {
world_attach_dyn(self(), stamina_property)
}
}
}