Mongoose: UserModel.create return inserted data in _doc object

[mirajehossain]

My node.js, mongoose and MongoDB version.
node: v10.15.0
mongoose: 5.4.1
mongodb: v4.0.4

I am fetching an issue with mongoose UserModel.create() function.
My code snippet is:
req.user = await UserModel.create(user)
when I console req.user it showed correct object,

{
            "_id": "5c47fa1a27b0651dce4da173",
            "fullName": "miraje hossain2",
            "mobile": "+8801273532927827",
            "deviceToken": "sfdlfhdsfdsfdsjflkdsfdsfd",
            "userType": 1,
            "favoriteSubject": []
 }

but when I spread req.user into another object like: let obj = {...req.user} then obj returns:

        "$__": {
            "strictMode": true,
            "inserting": true,
            "getters": {},
            "_id": "5c47fa1a27b0651dce4da173",
            "wasPopulated": false,
            "activePaths": {
                "paths": {
                    "userType": "require",
                    "mobile": "require",
                    "fullName": "require"
                },
                "states": {
                    "ignore": {},
                    "default": {},
                    "init": {},
                    "modify": {},
                    "require": {
                        "userType": true,
                        "mobile": true,
                        "fullName": true
                    }
                },
                "stateNames": [
                    "require",
                    "modify",
                    "init",
                    "default",
                    "ignore"
                ]
            },
            "pathsToScopes": {},
            "cachedRequired": {},
            "session": null,
            "emitter": {
                "domain": null,
                "_events": {},
                "_eventsCount": 2,
                "_maxListeners": 0
            },
            "$options": {}
        },
        "isNew": false,
        "_doc": {
            "_id": "5c47fa1a27b0651dce4da173",
            "fullName": "miraje hossain2",
            "mobile": "+8801273532927827",
            "deviceToken": "sfdlfhdsfdsfdsjflkdsfdsfd",
            "userType": 1,
            "favoriteSubject": []
        }

I can't figure out why its happen, can anyone help me to figure it out.

[mhombach]

The 2nd (large) object you see is the "real" object.
The "real" mongoose-model-object does not only contain the database-fields but many more meta-fields for internal management.
For example, isNew: false most likely tells the mongoose-library that if you save() this object, an UPDATE-type queryis used instead of an INSERT-type query.
Normally you would always see those attributes when logging and doing stuff.
But since this is irritating and changing/depending on those fields on your own can be risky, the mongoose-developers have decided to output only the database-fields (_doc:) wherever one would assume to see only those fields.
That's the reason why for example JSON.stringify() the model-object will also only print the _doc.
If there are any questions left, feel free to ask :)

[vkarpov15]

Mongoose docs have a lot of internal properties for change tracking, etc. Use {...req.user.toObject()} instead.

[mirajehossain]

@vkarpov15 I tried, but its return ...req.user.toObject() is not a function

[vkarpov15]

@mirajehossain can you check that req.user is actually instanceof mongoose.Document? Maybe you made a copy somewhere?

[vkpdeveloper]

It is too much simple, follow my steps :

1. let jsonData = JSON.stringify(dataFromDatabase);
2. let parsedMap = JSON.parse(jsonData)
   that's all now you just have your _doc data not everything.