Sequelize Typescript create object with associations - node.js

Question

I'm trying to build a new instance with OneToOne association, according to https://www.npmjs.com/package/sequelize-typescript
models/measure.ts :
#Table({ tableName: "measure" })
export class Measure extends Model {
...
// Token
#ForeignKey(() => Token)
#Column({ type: DataType.INTEGER, allowNull: false, unique: true })
id_token!: number
#BelongsTo(() => Token)
token!: Token
}
models/token.ts :
#Table({ tableName: "token" })
export class Token extends Model {
...
// Measure
#HasOne(() => Measure)
measure: Measure
}
my sequelize instance :
export const sequelize: Sequelize = new Sequelize({
...
repositoryMode: true,
})
sequelize.addModels([Token, Measure])
export const tokenRepository = sequelize.getRepository(Token)
export const measureRepository = sequelize.getRepository(Measure)
now i want to create a new Measure instance, with an existing Token :
const token = await tokenRepository.findOne({where: {value: value}})
...
console.log(token.isNewRecord) // false
const measure = measureRepository.build({...params, token: token}, {include: [{model: tokenRepository}]})
console.log(measure.token.isNewRecord) // true
await measure.save() // it try to insert an new token here
Sequelize try to insert a new token instead of insert only the measure. Where is my mistake ?

Answer 1

I faced this issue some times ago and by reading the docs and trying few things on my side I conclude it was not possible.
From what I saw you can create a new object and all is nested objects in one time. But you can't create a new object and link it to other existing objects in one time.
To do so you will have to do yourself the necessary find and/or update.
I never managed to make it work in one step and the documentation never talk about this. Always says that all elements are new.
An instance can be created with nested association in one step, provided all elements are new.
For more details :
https://sequelize.org/master/manual/creating-with-associations.html