Document:
[{
_id: "58aaf5f87fa9df48753fa04b",
username: "test",
stores: [ ]
}]
I want to add new objects in the stores element. IS there any way to automatically add a new _id for each new object I add? I'm using the version 2.6
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2 Answers
Using mongodb native driver not, it won't add an _id to sub-documents for you.
But if you use mongoose-odm it will add the _id automatically on an array of sub-documents.
If you use mongodb native driver you can just add and initialize a _id: ObjectID() field before save it:
const ObjectID = require('mongodb').ObjectID
const doc = {
_id: new ObjectID(),
username: "test",
stores: [ ]
}
doc.stores.push({ _id: new ObjectID(), value: '...' });
1 Comment
kennanwho
I tried the third option but for some reason it says ObjectId is not defined.
public class BatteryDetails {
/**
* The batteryId of the Battery.
*/
private String batteryId;
public BatteryDetails() {
batteryId= new ObjectId().toString();
}
}
This line (batteryId= new ObjectId().toString();) creates a objectId for the sub document.
