Suppose you have a mongoose schema with a sub schema

const userSchema = new Schema({
  name: {
    type: Schema.Types.String
  }
})

const eventSchema = new Schema({
  name: {
    type: Shema.Types.String,
  },
  user: {
    type userSchema
  }
})

const EventModel = new model(eventSchema);

This does not work

const event = new EventModel({ name: 'hi', user: { name: 'user' } });
event.user.name = 'new name';
await event.save();
// user.name is still 'user'

and this does not work

const event = await EventModel.find({_id: eventid});
event.user.name = 'new name'
await event.save()
const updated = await EventModel.find({_id: eventid});
console.log(updated.user.name); // not updated

and neither does this

const event = await EventModel.find({_id: eventid});
const keys = Object.keys(event.user);
keys.forEach(key => {
  if(key === 'name'){
    console.log('nope, does not exist.. just $__parent, and other ones');
  }
})

so how are you supposed to use sub-schemas?

I tried to use subschemas and it did not work