Question

我的文件如下。我想要做的是取消设置id并从每个文档中保留_id。

 "educations": [
 {
   "_id": ObjectId("58ec7aaaa3c19b8793805cca00e"),
   "school": "xyz",
   "type": "pqr",
   "updatedAt": ISODate("2017-04-11T06:36:03.588Z"),
   "createdAt": ISODate("2015-03-05T12:32:26.735Z"),
   "obj_type": "education",
   "current": false
 },
 {
   "_id": ObjectId("58eceeeee353c19b673805cca00f"),
   "school": "KTH",
   "type": "tun",
   "updatedAt": ISODate("2017-04-11T06:36:03.588Z"),
   "createdAt": ISODate("2015-02-16T23:17:12.393Z"),
   "obj_type": "education",
   "id": ObjectId("574eassssh83cbee22336d2d4"),
   "current": false
 },
 {
   "createdAt": ISODate("2016-08-19T07:31:12.640Z"),
   "updatedAt": ISODate("2016-08-19T07:31:12.640Z"),
   "type": "abc",
   "school": "KTH",
   "duration": "3+ år",
   "_id": ObjectId("57bsssss687dfec6716dd75"),
   "current": false
 }

var query = {
             $unset: {} 
            };
query.$unset['profile.educations.'+index+'.id'] = 1;
models.User.update({_id: user._id},query, function(err, val){
      //some operation
 });

我在这里做错了什么？一些建议受到高度赞赏。它可以在mongo控制台中使用相同的查询删除它。

Answer 1

您可以使用以下代码：

db.collection.find({
        educations: {
            $exists: true
        }
    }).forEach(function(myDoc) {
        var child = myDoc.educations;
        for (var i = 0; i < child.length; i++) {
            var ob = child[i];
            if ('id' in ob) {
                delete ob.id;
                child[i] = ob;
            }
        }db.collection.update({
            _id: myDoc._id
         }, {
            $set: {
                educations: child
            }
        });
        printjson(myDoc);
    });

（OR）你也试试这个，

db.collection.update({
   "educations.id": {$exists: true}
},{
   $unset: {
      "educations.$.id" : true
   }
},false,true)

从mongdb中的文档中取消设置id字段

1 个答案: