Mongoose upsert without deleting existing fields - node.js

Question

The goal of my code is to upsert an object into my database. I created the Schema which is a bit complex
const mongoose = require("mongoose");
const Schema = mongoose.Schema;
const objectSchema = new Schema(
{ message: String },
{ discriminatorKey: "type", _id: false }
);
const cameraSchema = new Schema(
{
number: { type: Number, required: true },
name: { type: String, required: true } //Do not update if exists
},
{ _id: false }
);
const mainSchema = new Schema(
{
name: { type: String, required: true, trim: true },
lastUpdateTime: { type: Date, default: Date.now },
objects: [objectSchema]
},
{ collection: "mainCollection" }
);
mainSchema.path("objects").discriminator(
"TypeA",
new Schema(
{
cameras: [cameraSchema],
enabled: { type: Boolean } //Do not update if exists
},
{ _id: false }
)
);
mainSchema.path("objects").discriminator(
"TypeB",
new Schema(
{
available: { type: Boolean, required: true },
enabled: { type: Boolean } //Do not update if exists
},
{ _id: false }
)
);
module.exports = mongoose.model("mainModel", mainSchema);
I am receiving the following object from an external source
{
"name": "040C7",
"objects": [
{
"type": "TypeA",
"cameras": [
{
"number": 1
},
{
"number": 2
},
{
"number": 3
}
]
},
{
"type": "TypeB",
"available": false
}
]
}
If the name exists in my database, I should update every field that I received without removing/updating the fields :
enabled in TypeA and TypeB
name in the camera objects
Otherwise, I should insert it in the database with all the fields and default values for enabled (true) and name (Camera)
I already tried the UpdateOne() function but it is deleting my fields enabled and name when they already are in my database
const obj = new myModel(message);
let upsertObj = obj.toObject();
delete upsertRcm._id;
MyModel.updateOne(
{ name: obj.name },
upsertObj,
{ upsert: true },
err => {
console.log(err)
}
);
How can I say to mongoose to keep fields that are already in my database but not in my received object ?
Document in database
{
"lastUpdateTime": "2018-11-07T09:12:30.750Z",
"name": "040C7",
"objects": [
{
"type": "TypeA",
"enabled": true,
"cameras": [
{
"number": 1,
"name": "Camera",
}
]
},
{
"type": "TypeB",
"enabled": true,
"available": false
}
]
}
After the update with the received object
{
"lastUpdateTime": "2018-11-07T09:14:30.600Z",
"name": "040C7",
"objects": [
{
"type": "TypeA",
"cameras": [
{
"number": 1,
},
{
"number": 2,
},
{
"number": 3,
}
]
},
{
"type": "TypeB",
"available": false
}
]
}
But it should be
{
"lastUpdateTime": "2018-11-07T09:14:30.600Z",
"name": "040C7",
"objects": [
{
"type": "TypeA",
"enabled": true
"cameras": [
{
"number": 1,
"name": "Camera"
},
{
"number": 2,
},
{
"number": 3,
}
]
},
{
"type": "TypeB",
"enabled": true,
"available": false
}
]
}
MongoDB version: 4.0.2
The name field is my unique identifier. Only one type "TypeA", "TypeB", ... will be present in the array. I will never receive 2 "TypeA" in my objects
The list of fields that have to be updated :
objects["TypeA"].cameras.number (value from new object)
objects["TypeB"].available (value from new object)
lastUpdateTime (Date now)
The list of fields that are in the database and should kept :
objects["TypeA"].enabled
objects["TypeA"].cameras.name
objects["TypeB"].enabled