如何使用nodeJS从JSON对象中删除项目?

问题描述：

我正在使用节点v8.11，无法从该对象删除一个项目，该对象会从mongoDB创建并返回新对象.

I am using node v8.11, not able to delete an item from the object which creates and returns new object from the mongoDB.

创建后的示例响应:

{
    "name": "",
    "device": "",
    "session":"",
    "_id": "5b7e78c3cc7bca3867bbd1c9",
    "createdAt": "2018-08-23T09:05:07.134Z",
    "updatedAt": "2018-08-23T09:05:07.134Z",
    "__v": 0
}

尝试从响应中删除"_id"，如下所示:

Trying to remove "_id" from the response like below:

tokens.create(req.body).then(function(session){
     delete session._id;
     return res.send(session); // _id still exist
});

我已经看到在ES6中不建议使用删除方法，这是这种情况吗? 如何使用密钥在一行中删除项目?

I have seen the delete is deprecated in ES6, is this case issue? How can I delete an Item, in one line using the key?

答

使用猫鼬模型创建对象时，它将返回一个模型对象，而不是普通的javascript对象.因此，当您执行delete session._id;时，它将不起作用，因为session是模型对象，并且不允许直接更改模型对象的属性.

When you create a object using mongoose model then it will return you a model object instead of plain javascript object. So, when you do delete session._id; it will not work as session is a model object and it does not allow to change the property on model object directly.

您需要使用模型对象的toJSON()或toObject()方法将模型对象更改为普通JS对象，并删除其上的属性:

You need to change the model object to plain JS object using toJSON() or toObject() method of model object and delete property on that:

tokens.create(req.body).then(function(session) {
  var sessionObj = session.toJSON();
  delete sessionObj._id;
  return res.send(sessionObj);
});

如何使用nodeJS从JSON对象中删除项目?

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