'use strict';
const mongoose = require('mongoose');
const UserSchema = new mongoose.Schema({
    name: String,                   // full name
    create_date: Date,              // signup date
    email: String,                  // email == username
    password: String,               // hashed password
    options: {
        assistants: {
            default: {
                enabled: Boolean,   // Turn assistant on
            },
        },
    .... (other settings)
    },
});

module.exports = mongoose.model('User', UserSchema);

user:model
    $__: internalCache{...}
    $init: true
    create_date: (...)
    email: (...)
    errors: undefined
    id: (...)
    isNew: false
    name: (...)
    options: model
        $init: true
        assistants: model
            $init: true
            create_date: undefined
            default: model
                $init: true
                assistants: undefined
                create_date: undefined
                email: undefined
                enabled: false          <= the only real property!
                id: undefined
                name: undefined
                options: undefined
... etc
            email: undefined
            id: undefined
            name: undefined
            options: undefined
            password: undefined
...etc
        $__: internalCache{...}
        $__isNested: true
        email: undefined        <= these ones are greyed-out
        id: undefined
        name: undefined
        options: undefined
        password: undefined

"mongoose": {
  "version": "4.11.12",

$ mongod --version
db version v3.6.2

$ node -v
v9.4.0