Creating instance with an association in Sequelize - node.js

Question

Using Sequelize, I've created two models: User and Login.
Users can have more than one Login, but a login must have exactly one user, which means a Login cannot be saved without a User ID.
How do I .create a Login with a User association all in one swoop?
Current Code (Doesn't Work)
// Set up the models
var User = sequelize.define('User', {});
var Login = sequelize.define('Login', {});
Login.belongsTo(User, {
onDelete: 'cascade',
foreignKey: {
field: 'userId',
allowNull: false,
}
});
// Create the instances
var user = User.create().then(function() {
// THIS IS WHERE I WOULD LIKE TO SET THE ASSOCIATION
var login = Login.create({
userId: user.get('id')
});
)};
The above results in SequelizeValidationError: notNull Violation: UserId cannot be null

Answer 1

Assuming you have the right association between users and login,
you can just create a user including a login:
User.create({
name: "name",
Login: {...}
},{
include: Login
})
you can find more information here:
https://sequelize.org/docs/v6/advanced-association-concepts/creating-with-associations/

Answer 2

First of all you need to setup the relations in both ways, like this:
// Set up the models
var User = sequelize.define('User', {});
var Login = sequelize.define('Login', {});
// Set the correct associations
User.hasMany(Login, {})
Login.belongsTo(User, {});
Then, you need to properly get the instances returned by the promises:
// Create the instances
User.create({}).then(function(newUser) {
// now you can use newUser acessors to create the login
return newUser.createLogin({});
).then(function(newLogin){
// newLogin
}).catch(function(error){
// error
});

Answer 3

In your .then, the callback receives the model instance created by the previous call. You need to specify the argument inside the callback function.
var user = User.create().then(function(user) {
// THIS IS WHERE I WOULD LIKE TO SET THE ASSOCIATION
var login = Login.create({
userId: user.get('id')
});
return login
}).then(function(login) {
// all creation are complete. do something.
});
Also something important I would like to point out is your missing var statements! Those are important but not related to this question. See Declaring variables without var keyword

Answer 4

An Update to #Arwed Mett's answer
//Create Association Alias or just setting association alias by using 'as' keyword will also work
Login.User = Login.belongsTo(User);
User.create({
name: "name",
Login: {...}
}, {
include: [{
association: Login.User
}]
});
Refrence link - http://docs.sequelizejs.com/manual/tutorial/associations.html#creating-with-associations

Answer 5

For those like me who were trying to create an instance of a model including another instance, like:
var login1 = await Login.create(...);
var user1 = await User.create({
Login: login1
}, {
include: Login
});
You can't because this method is used to embed an instance (Login) which is not already existing and that will be created at the parent instance (User) creation level.
So, if you want to embed an already existing Login in the newly created User, do instead:
var login1 = await Login.create(...);
var user1 = await User.create({
loginId: login1.get('id')
}, {});

Answer 6

You have association between User an Login with constraint allowNull at false. You must create Login before User or set allowNull at true in model and the table to DB (LoginId Null constraint)
var User = sequelize.define('User', {});
var Login = sequelize.define('Login', {});
Login.belongsTo(User, {
onDelete: 'cascade',
foreignKey: {
field: 'userId',
allowNull: false,
}
});
Solution
Login.create({
username: "username",
User: {...}
},{
include: User
})

Answer 7

I have the same issue recently!
I have a typo mistake with the foreignKey config. Use field instead of name caused the issue.
The change below will fix it.
{
foreignKey: {
name: 'userId',
allowNull: false,
}
}

Answer 8

As an extra you could also nest your creation to be even more effective and concise.
// Set up the models
var User = sequelize.define('User', {});
var Login = sequelize.define('Login', {});
...
User.create({
name: "name",
Login:
{
users: {..i.e several users if a user belongs to another user..}
}
},{
include:{
model: Login,
include: User //nested model.Create
}
})
as seen here: https://github.com/sequelize/sequelize/issues/7252