如何在mongo和尚中使用$ in

什么孟加拉的和平代码为和尚？

use challenger_documents db.question.find({_id: {$in: [ObjectId("56587ad1c30ea73eb22546f0"), ObjectId("5659779b5eb5a70f35db8125")]}}) 

例如，我试过，但它返回[]：

 var mongodb = require('mongodb'); var monk = require('monk'); var db = monk('localhost:27017/challenger_documents'); question = db.get("question") question.find({_id:{$in:["5659cba1ef72b7ef523206c5"]}},{},function(e,d){console.log(d)}) 

Answer 1

您需要将_idstring转换为ObjectId ：

 var mongodb = require('mongodb'), monk = require('monk'), db = monk('localhost:27017/challenger_documents'), ObjectId = mongodb.ObjectID, question = db.get("question"); question.find({_id: { $in: [ ObjectId("5659cba1ef72b7ef523206c5") ] } },{},function(e,d){ console.log(d) });