如何使用dynamodb-data-mapper更新一个查询中的属性？

const { DataMapper } = require('@aws/dynamodb-data-mapper');
const { DynamoDB } = require('aws-sdk');
const mapper = new DataMapper({ client: new DynamoDB() });

class MyModel {
  constructor() {
    this.partitionKey = 'partitionKeyValue';
    this.sortKey = 'sortKeyValue';
    this.attributeToUpdate = 'newValue';
  }
}

async function getItemsToUpdate() {
  const items = [];
  for await (const item of mapper.scan(MyModel)) {
    items.push(item);
  }
  return items;
}

const itemsToUpdate = await getItemsToUpdate();

async function updateItems(items) {
  for (const item of items) {
    item.attributeToUpdate = 'updatedValue';
    await mapper.update(item);
  }
}

await updateItems(itemsToUpdate);