node.js - mongoose 从 MongoDB (NodeJS/AWS Lambda) 检索空数组

Question

我正在 AWS Lambda 函数中使用 NodeJS 为 MongoDB Atlas 创建连接。我能够成功建立连接，但是当我执行 .find({}) 来获取所有数据时，我得到一个空数组。

Lambda

const mongoose = require('mongoose');

let conn = null;

const uri = 'mongodb+srv://xxx:xxx@todo-fnddg.mongodb.net/test';
let M = null;
exports.handler = async function(event, context) {
  nodejs-aws-lambda-mongodb-atlas
  context.callbackWaitsForEmptyEventLoop = false;
  if (conn == null) {
    conn = await mongoose.createConnection(uri, {
      bufferCommands: false,
      bufferMaxEntries: 0,
      useNewUrlParser: true
    });
    M = conn.model('Todo', new mongoose.Schema(
      {
        title: String,
        description: String,
        date: Date,
        status: String
      }
    ));
  }


  const doc =  M.find({});
  console.log('items in the DB')
  console.log(doc);

  return null;
}; 

文档 Mongoose AWS Lambda: https://mongoosejs.com/docs/lambda.html

更新:

 M.find({}).exec().then(function(allDocs){
    console.log('getting al docs')
    console.log(allDocs)//[]
  });

MongoDB Atlas

Answer 1

find是异步的，所以我认为你需要这样做:

M.find({}).exec().then(function(allDocs){
   //do your thing
});

或者等待

let alldocs = await M.find({});