如果我有一个mongo文件ID作为字符串我如何查询它作为_id？ [英] If i have a mongo document id as a string how do I query for it as an _id?

问题描述

如果我有一个mongo文档id作为字符串，我该如何查询它作为_id？

If i have a mongo document id as a string how do I query for it as an _id?

它能正常工作 .find（{_ id：'stringID'}）或者我是否需要先将其转换为bson对象？

Will it work correctly to do .find({_id:'stringID'}) or do I need to convert it to a bson object first?

推荐答案

你的意思是你有一个ObjectId的24位十六进制数字字符串吗？

Do you mean you have the 24 hex digit string of an ObjectId?

假设这就是你的意思，大多数司机都有办法取一个字符串并将其转换为ObjectId。在JavaScript中：

Assuming that's what you mean, most drivers have a way to take a string and convert it to an ObjectId. In JavaScript that's:

.find({_id:new ObjectId("4f91bfcfaa7c5687a0c686d4")})

已更新对节点本机驱动程序更有用（来自 https://github.com/christkv/node-mongodb-native ）：

Updated to be a bit more useful for the node-native driver (from the documentation at https://github.com/christkv/node-mongodb-native):

// Get the objectID type
var ObjectID = require('mongodb').ObjectID;

var idString = '4e4e1638c85e808431000003';
collection.findOne({_id: new ObjectID(idString)}, console.log)  // ok
collection.findOne({_id: idString}, console.log)  // wrong! callback gets undefined

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