node.js - 如何在mongo和尚中使用$in

Question

和尚的mongo等价代码是什么？

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

例如，我尝试了这个，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_id字符串转换为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) });