有没有办法使用node-mongodb-native的动态密钥？ [英] Is there any way to use a dynamic key with node-mongodb-native?

问题描述

有没有办法在node-mongodb-native驱动程序中使用动态密钥？我的意思是让变量持有密钥而不是直接使用密钥。

Is there any way to use dynamic keys with the node-mongodb-native driver? By this I mean having a variable hold the key instead of using the key directly.

正如通常那样：

db.createCollection('col', function(err, col){
    col.insert({'_id':'wak3ajakar00'});
}

代替这样做：

db.createCollection('col', function(err, col){
    var ID = '_id';
    col.insert({ID:'wak3ajakar00'});
}

当我运行后一个代码时，我最终得到了除了标准创建的 _id 之外，集合db.col中的文档带有一个名为 ID 的键，而不是仅仅一个键 _id ，其值为 wak3ajakar00 。这让我相信实际上不可能直接这样做。

When I run the latter code, I end up with a document in collection db.col with a key called ID in addition to a standardly created _id, as opposed to just a key _id with the value wak3ajakar00. This leads me to believe that it isn't actually possible to do this directly.

相反，我现在只是创建我想提前插入的文档，如下所示：

Instead, I'm now just creating the document that I want to insert ahead of time as follows:

db.createCollection('col', function(err, col){
    var ID = 'wak3ajakar00';
    var key = '_id';
    insertion = {}
    insertion[key] = ID;
    col.insert(insertion);
}

这与我想要的完全一样，但我只是想知道是否有更好的方法可以解决这个问题。 JavaScript，NodeJS和MongoDB对我来说都是新手，所以我觉得我很容易丢失一些东西。如果没有，有没有更简洁的方法在JavaScript中编写上述代码？

This works exactly like I want it to, but I just wanted to know if there are any better ways to go about this. JavaScript, NodeJS, and MongoDB are all new to me, so I feel like I could easily be missing something. If not, are there any cleaner ways to write the above code in JavaScript?

最好，谢谢，
萨米

Best, and thanks,
Sami

推荐答案

在对象文字语法中，不能将变量用作键名，只能使用值。这样做的方法是你已经发现的方式 - 首先创建你的对象，然后使用方括号表示法将属性作为一个单独的步骤添加。

In object literal syntax, you cannot use a variable as the key name, only values. The way to do it, is the way you already discovered - create your object first, then add the property as a separate step using square bracket notation.

var obj = {};
var ID = "_id";
obj[ID] = "wak3ajakar00";

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