How to create to-one relationship with the authenticated user

MongoDB Atlas App Services & Realm Atlas Device Sync
1

Hello,

I would like to know what is the best solution to manage authenticate user.

We can get the authenticate user id with

user = useUser()
console.log(user.id)

Has it is not part of a collection i can not create to-one relationship

for example here I can only create a to-many relationship (userId being the foreign key) :

export class Picture extends Realm.Object {
  static schema = {
    name: "Picture",
    properties: {
      _id: { type: "objectId", default: () => new Realm.BSON.ObjectId() },
      pictureUrl: { type: "string", default: () =>  "https://img.freepik.com/premium-vector/cute-australian-shepherd-dog-avatar-cartoon_357749-252.jpg?w=740" },
      pictureBlob: "data?",
      userId: "string"
    },
    primaryKey: "_id",
  };
}

My workaround would be to create a user collection with the to-one relationship with Picture like :

export class User extends Realm.Object {
  static schema = {
    name: "User",
    properties: {
      _id: { type: "objectId",},
      name: "string?",
      picture: "Picture?"
    },
    primaryKey: "_id",
  };
}

and i remove the UserId from my Picture shema

Then
i will create the user object when the user logs in

Is it the right way to do?
Is there any other way to manage users information and create to-one relationship?