创建具有userId的集合或基于userId的筛选器集合

const MongoClient = require('mongodb').MongoClient;
const uri = "your_mongodb_connection_string";
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });

async function createUserIdCollection() {
  try {
    await client.connect();
    const database = client.db('your_database_name');
    const collection = database.collection('userProfiles', { key: { userId: 1 } });
    console.log("Collection created with userId as key");
  } finally {
    await client.close();
  }
}

createUserIdCollection().catch(console.dir);

async function getUserProfile(userId) {
  try {
    await client.connect();
    const database = client.db('your_database_name');
    const collection = database.collection('userProfiles');
    const userProfile = await collection.findOne({ userId: userId });
    console.log(userProfile);
    return userProfile;
  } finally {
    await client.close();
  }
}

getUserProfile('your_user_id').catch(console.dir);