File::hasAttachedObjects

public function hasAttachedObjects(): bool
{
	$query = new Query(AttachedObjectTable::getEntity());
	$query
		->addSelect('ID')
		->setFilter([
			'=OBJECT_ID' => $this->id,
		])
		->setLimit(1)
	;

	$data = $query->exec()->fetch();

	return !empty($data['ID']);
}