How to add entrys in 1:1 model in sequelize?

Question

I´ve followed official documentation and much of web posts for build models and associations in sequelize.

I´ve created 2 models, user and key (passwords). I´ve created a: Key.belongsTo(User, {foreignKey: 'userId'}) association.

Well, when I launch the app, sequelize.sync() creates tables correctly, and creates a Keys table which has these fields:

id (PK) // key (string) // createdAt // updatedAt // userId (FK)

It seems all is correct but I've been stuck for a few days here, I want to use this model in user-controller.js where I want create an entry in the Users table that automatically create an entry in Keys table but, when I do something like below, nothing happens in the Keys table:

let newUser = await User.build({
    name: params.name,
    surname: params.surname,
    nick: params.nick,
    email: params.email,
    key: params.password            
})
    
let insertUser = await newUser.save();  

Obviously, I'm using brcrypt in the original code.

If I try to trick the entry and I do something like:

let newIdUserEntry = insertUser.id;

let newKey = await Key.build({
    key: hashPass,
    userId: newIdUserEntry
})

newKey.save(); 

The entry in Keys table, has a null in userId.

Answer 1

In case it helps other people, this is the code I finally implemented:

// Models
let User = require('../models/user')(sequelize, Sequelize);
let Key = require('../models/key')(sequelize, Sequelize);

// Associations
User.hasOne(Key, {foreignKey: 'userId'});
Key.belongsTo(User, {foreignKey: 'userId'}); 
User.hasMany(Friend, {foreignKey: 'IDtarget'})

let newUser = await User.build({
    name: params.name,
    surname: params.surname,
    nick: params.nick.toLowerCase(),
    email: params.email.toLowerCase(),        
    Key: {
        key: hashPass
    },            
    image: null
},{
    include: [{ model: Key}]  //, through: 'userId'}]
})

Thanks for helping me!