如何使用_id从mLab集合更新对象 [英] how to update an object from mLab collection using _id

问题描述

我目前在后端有一个可以更新数组的api.问题是，它甚至不引用_id，而仅更新数组中的第一项.每当我编辑其他对象的值，然后单击更新时，它只会更新集合中的第一个对象.

I currently have an api in my backend that can update my array. The problem is, it doesn't even reference the _id and only updates the first item in my array. Whenever I edit the values for the other objects and then click on update, it only updates the first object in my collection.

这是代码:

router.route('carousel/update/:id').put(function(req, res) {
var data = req.body;
const myquery = {"_id": ObjectId };

db.collection("home").updateOne(myquery, {
    $set: {
        "img": data.img,
        "header": data.header,
        "subheader": data.subheader
    }
}, (err, results) => {
   res.status(200).json({status: "ok"})}
})

这段代码使我可以仅更新集合中的第一个对象.为了允许使用_id更新特定对象，我如何进行其他配置?我想念什么?

This chunk of code allows me to update the first only the first object in my collection. How do i configure it otherwise in order to allow updating specific objects using the _id? What am I missing?

编辑

查看其他堆栈溢出帖子后，这就是我所做的:

After looking at other stack overflow posts, this is what I did:

const myquery = {"_id" : ObjectId(req.params.id) };

但是现在我得到一个错误，说传入的参数必须是12个字节的单个字符串或24个十六进制字符的字符串.同样，当我控制台日志时，URL的':id'部分未定义.

But now I get an error saying 'argument passed in must be a single string of 12 bytes or a string of 24 hex characters. Also when I console log, the ':id' part of the URL is undefined.

推荐答案

您正在使用 updateOne ，它应为 updateMany 如下

You are using updateOne its should be updateMany as follows

db.collection("home").updateMany(myquery, {

updateOne 将更新第一个文档.

编辑

也请看这行

const myquery = {"_id": ObjectId }; is incomplete

应该是

const myquery = {"_id": ObjectId("some id") };

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