Sequelize create instance of object Many-to-many relationship - node.js

Question

I'm using Sequelize to create an instance of Many-to-Many relationship, but it not working.
First, I have a model with two class as below:
Room:
Room.init({
id: {
type: DataTypes.UUID,
primaryKey: true,
defaultValue: DataTypes.UUIDV4,
},
name: {
type: DataTypes.STRING,
allowNull: false,
},
}, { sequelize, modelName: "Room" }
);
User:
User.init(
{
id: {
type: DataTypes.UUID,
primaryKey: true,
defaultValue: DataTypes.UUIDV4,
},
name: {
type: DataTypes.STRING,
allowNull: false,
},
},
{ sequelize, modelName: "User"}
);
UserRoom:
UserRoom.init("UserRoom", { sequelize });
Relationship:
User.belongsToMany(Room, { as:'container', through: UserRoom, foreignKey: "userId" });
Room.belongsToMany(User, { as:'joiners', through: UserRoom, foreignKey: "roomId" });
And the UserRoom has another key with Message Model:
UserRoom.belongsTo(Message, { as: "lastReadMessage" });
Ok, now when i create a new Room with code:
const room = await Room.create(
{
name: name,
avatarId: avatarUri,
joiners: [
{
id: '1',
},
{
id: '2',
},
],
},
{
include: [{ association: User, as: 'joiners' }],
}
);
I get an error:
TypeError: Cannot read properties of undefined (reading 'name')
I don't know why error, I try this example but it still wrong.
My question is: How I create object and link to another relationship?
UPDATE
Now, I can run it with below code:
const room = await Room.create({
name: name,
avatarId: avatarUri,
});
await UserRoom.bulkCreate(
[
{
lastReadMessageId: null,
userId: 1,
roomId: room.id,
},
{
lastReadMessageId: null,
userId: 2,
roomId: room.id,
},
]
);

Answer 1

You're trying to create users with id equals to 1 and 2 along with creating a room. If you wish to associate existing users with a new room then you need to call addJoiners of a new room model:
const room = await Room.create(
{
name: name,
avatarId: avatarUri,
);
// pass user instances or ids.
await room.addJoiners([1,2])