在猫鼬不工作的情况下更新子数组对象 [英] Updating subarray object with Mongoose not working

问题描述

我的MongoDB数据库主文档如下:

My MongoDB database main document looks like this:

    {
        "_id": {
            "$oid": "568ad3db59b494d4284ac191"
        },
        "name": "Myclass",
        "items": [
          {
            "name": "Conductive Gel",
            "internal_id": "ID00067",
            "description": "ECG Conductive Gel",
            "short_description": "ECG Conduct. Gel",
            "providers": [
              {
                "name": "one",
                "address": ""
              },
              {
                "name": "two",
                "address": ""
              }
            ]

          },
          {

          }
        ]
   }

好的，那是我收到一个应该更新其中一项(与_id匹配的项)的ajax put调用.

Ok the thing is that I am receiving an ajax put call that should update one of the items (the one that matches the _id).

我的方法:

exports.updateItem = function(req, res, next) { 


              classes.findOne({_id: '568ad3db59b494d4284ac19d'}, function(e,myclass){
                    if(!e) {

                      myclass.items.forEach(function(item){
                        if (item._id == req.body._id) {

                            item = req.body;
                            myclass.save(function(err, doc){


                                if (err) return next(err);
                                return res.status(200).send('The item has been updated!');
                            });
                        }                              
                      });

                    } else {
                        res.status(500).send('Class not folund in BBDD!!');
                    }
                });
};

问题是，当我执行item = req.body;时，req.body信息未映射到项目猫鼬对象中，并且数据库中的项目也未更新.我也没有任何错误.

The thing is that when I do item = req.body; the req.body info is not mapped into the item mongoose object and the item in the database is not updated. I don't get any error either.

在执行item = req.body;的那一刻，我检查了req.body和item是否具有完全相同的字段.

I have checked that req.body and item both have the exact same fields in the moment that I do the item = req.body; .

另一方面，如果我执行item.name='whatever'，它会起作用.

If I do item.name='whatever' , on the other hand, it works.

我已经为这个问题奋战了4个小时，没有解决办法...

I've been fighting with this issue for 4 hours now without a solution...

我还尝试了Mongoose的findOneAndUpdate()查询，但没有成功.

I have also tried Mongoose's findOneAndUpdate() query without success..

推荐答案

如果将item分配给新值，则实际上并没有更改数组的内容. item只是对数组中元素的引用.

If you assign item to a new value you are not actually changing the content of the array. item is just a reference to the element in the array.

您可能想要的是通过合并两个对象item和req.body来编辑数组的内容.

What you probably want is to edit the content of the array by merging the two objects item and req.body.

require('extend'); // npm install extend
extend(item, req.body);

这实际上将更新数组中的值，然后将其保存.

That will actually update the value in the array which will then be saved.

但是，我建议使用猫鼬来更新子文档，如下所述:猫鼬查找/更新子文档

However, I recommend updating the subdocument using mongoose as explained here: Mongoose find/update subdocument

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