插入对象MongoDB的数组 [英] Insert Into Array of object MongoDB

问题描述

我有

{
    "_id" : ObjectId("5a25af80d2c4dd065991dccc"),
    "username" : "[e-mail]",
    "password" : "$2a$10$ptFyLKtyyrL5gMYdXS6wV.HLUA4Py5iudMJDldf5qsHFS4.9TPCyy",
    "role" : "Admin",
    "__v" : 0,
    "list" : [ 
        {
            "name" : "We",
            "arr" : [ 
                "5a26d554677475818a795f75", 
                "5a395bb0976d5304c07f7dd4"
            ]
        }, 
        {
            "name" : "sandeep",
            "arr" : [ 
                "5a26d554677475818a795f75"
            ]
        }
    ]
}

我想在list.arr中添加一个元素，其中name ='we' 并仅在元素不存在时添加

I want to add an element inside list.arr where name = 'we' and add only if the element does not exist

我如何执行此查询.

推荐答案

通过使用此嵌套查询，我解决了这个问题. 我正在使用Node JS

By using this nested query I solved this problem. I'm doing it with Node JS

router.post('/prevList', (req, res) => {
  User.update({'_id':req.user.id, list: { $elemMatch: { name: req.body.name } } },{  $addToSet: { "list.$.arr": {$each: req.body.arr} } },function(err,data) {
    console.log(data);
    res.send(data)
  });
});

这里

req.body: {name:'we',arr:["5a395bb0976d5304c07f7dd4"]}

和req.user.id是身份验证ID.

希望这对您也有帮助.

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