Create model with its association in sequelize - node.js

Question

I'm using sequelize as my nodejs web app ORM.
I have 2 models, Offer and Game. There is a 1:1 association between them, and I am considering how to implement it.
First, I tried using Offer.belongsTo(Game) so that the GameId resides in the Offer model. When I create an Offer, I want that the Game to be created as well.
I have set the association as follows:
Offer.belongsTo(models.Game, {
foreignKey: {
allowNull: false
}
})
So that the GameId will never be null. In sequelize docs, it is noted that I could create the Game together with the Offer like this:
models.Offer.create({Game:{"name":"The Last of Us", "platform":"PC"}},{include:[models.Game]});
But I'm getting:
Unhandled rejection SequelizeDatabaseError: null value in column "GameId" violates not-null constraint
How can I create an Offer and a Game in 1 action using the not null constraint?
EDIT:
module.exports = function(sequelize, DataTypes) {
var Game = sequelize.define("Game", {
name: {
type: DataTypes.STRING,
allowNull: false
},
platform: {
type: DataTypes.ENUM('PC', 'PS4', 'PS3', 'XB1', 'XB360'),
allowNull: false
},
cover: {
type: DataTypes.STRING,
allowNull: false,
validate: {
notEmpty: true
}
}
}, {
updatedAt: false,
createdAt: false
});
return Game;
};
module.exports = function(sequelize, DataTypes) {
var Offer = sequelize.define("Offer", {
price: {
type: DataTypes.INTEGER,
validate: {
max: 999,
min: 0
}
},
exchange: {
type: DataTypes.BOOLEAN,
defaultValue: true,
allowNull: false
}
}, {
updatedAt: false,
classMethods: {
associate: function(models) {
Offer.belongsTo(models.Game, {
foreignKey: {
allowNull: false
}
});
}
}
});
return Offer;
};

Answer 1

You didn't put anything for Offer object. You're just passing Game object.
models.Offer.create({
//set fields for 'Offer'
Game:{"name":"The Last of Us", "platform":"PC"}
},
{include:[models.Game]}
);
Also, you just have to define foreignKey while setting associations. Constraint definition resides in model:
Offer.belongsTo(models.Game, {
foreignKey: 'GameId'
});