如何在mongoDB中推送除重复对象外的对象

const MongoClient = require('mongodb').MongoClient;

// 连接到MongoDB数据库
const url = 'mongodb://localhost:27017';
const dbName = 'mydb';
MongoClient.connect(url, function(err, client) {
  if (err) throw err;
  console.log('Connected successfully to server');

  const db = client.db(dbName);
  const collection = db.collection('mycollection');

  // 查询已存在的对象
  collection.find({}).toArray(function(err, docs) {
    if (err) throw err;

    const uniqueObjects = [];
    const uniqueFieldValues = new Set();

    // 遍历每个对象
    docs.forEach(function(doc) {
      // 判断是否为重复对象
      if (!uniqueFieldValues.has(doc.field)) {
        uniqueObjects.push(doc);
        uniqueFieldValues.add(doc.field);
      }
    });

    // 插入除重复对象外的对象
    collection.insertMany(uniqueObjects, function(err, result) {
      if (err) throw err;
      console.log('Inserted documents:', result.insertedCount);
      client.close();
    });
  });
});