ludic/docs/language/ecs/kw-attach.md
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

1.2 KiB

id name category kind tokens sig tip order
kw-attach attach ecs keyword attach attach Prop on entity { overrides } Structurally add a property to a live model instance, seeding its fields. 6

attach adds a property to a live model instance that did not have it, seeding the fields from their defaults plus any overrides in the { … } block, and fires the property's @OnAttach(Prop) hook. It is a structural change — it changes what the instance has — as opposed to enable, which merely resumes a property the instance already carries. Attaching a property the instance already has is a no-op, so the hook only runs on a real transition. Use it to grant something new at runtime: give a player a shield pickup, tag an enemy as enraged, or add a component only some instances need.

program Pickups {
  property Position { column: int = 0, row: int = 0 }
  property Shield   { amount: int = 0 }
  model Player { Position }

  handler Boot phase Start {
    spawn Hero { Position { column: 6, row: 6 } }
  }

  handler GrabShield phase Update {
    if Input.key() == ' ' {
      for (position) in query [Position, {Player}] {
        attach Shield on self() { amount: 3 }
      }
    }
  }
}