Sequelize Invalid value [object Promise] using assocations - mysql

Question

My current models:
let Book = sequelize.define('book', {
title: Sequelize.STRING,
author: Sequelize.STRING,
...
});
let Recommendation = sequelize.define('recommendations', {
reasoning: Sequelize.STRING,
rating: Sequelize.FLOAT,
});
Book.belongsToMany(Recommendation, {through: 'bookrecommendation'});
Recommendation.belongsToMany(Book, {through: 'bookrecommendation'});
When executing code below method addRecommendation to add Recommendation for Book I get an error Error: Invalid value [object Promise]
Book.findOrCreate({
where: { id: '1' }, defaults: {
author: 'test',
title: 'test'
}
})
.spread(function (b, createdBook) {
const rec = Recommendation.create(
{
reasoning: 'test',
rating: 1
});
b.addRecommendation(rec).then((result) => {
}, (error) => {
console.log(error);
})
}

Answer 1

The issue here is that rec is a promise.
This should solve the issue
Book.findOrCreate({ where: { id: '1' }, defaults: {
author: 'test',
title: 'test'
}}).spread(function (b, createdBook) {
Recommendation.create({
reasoning: 'test',
rating: 1
}).then((rec) => {
b.addRecommendation(rec).then((result) => {}, (error) => {
console.log(error);
})
})