How to organize MongoDB database structure?

Question

JavaScript

I'm creating a simple note-taking app like google keep.
Each user has notes and a list of labels, each note can have multiple labels.
Actually the question is: should I create separate models for labels and notes, or store them in the user's document? If separately, how best to group them for each user?

Answer 1

It really all depends on the functionality that you want to implement.
I would do it all as separate models, so it will be possible to implement their normal editing and modification, with a pull-up to all created entities.
That is, the structure would look something like this:

User {
    _id: ObjectId('...'),
    notes: [
        ObjectId('Note1...'),
        ObjectId('Note2...'),
        ObjectId('Note3...')
    ]
}


Note {
     _id: ObjectId('Note1...'),
     ...,
    labels: [
        ObjectId('Label 1'), 
        ObjectId('Label 2'),
    ]
}


Label {
    _id: ObjectId('Label 1'),
    name: "Label 1"
}

Again, formally, labels can be stored directly in the records, but then such a task as filtering by some of the labels becomes unreasonably more difficult + it will be more difficult to maintain data consistency.