通过$in使用ID数组更新多个文档时的向上插入问题

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

// Connection URL
const url = 'mongodb://localhost:27017';

// Database Name
const dbName = 'myproject';

// Create a new MongoClient
const client = new MongoClient(url);

// Use connect method to connect to the Server
client.connect(function(err) {
  assert.equal(null, err);
  console.log('Connected successfully to server');

  const db = client.db(dbName);

  // Define the documents to update
  const documentsToUpdate = [
    { _id: 1, name: 'Document 1' },
    { _id: 2, name: 'Document 2' },
    { _id: 3, name: 'Document 3' },
    { _id: 4, name: 'Document 4' }
  ];

  // Create the bulk write operations
  const bulkOps = documentsToUpdate.map(doc => ({
    updateOne: {
      filter: { _id: doc._id },
      update: { $set: { name: doc.name } },
      upsert: true // Insert the document if it doesn't exist
    }
  }));

  // Execute the bulk write operations
  db.collection('mycollection').bulkWrite(bulkOps, function(err, result) {
    assert.equal(null, err);
    console.log('Documents updated: ' + result.modifiedCount);
    console.log('Documents inserted: ' + result.upsertedCount);
  });

  // Close the connection
  client.close();
});