Referencing a composite primary key in a Sequelize.js seed model - database

Question

Is it possible to reference composite primary keys in Sequelize?
I'm working on a web-app that helps organize kitchen waste. The restaurant organizes its weeks and months into 'periods' where the first week of September would be '9.1'. For every period, I need to create a new batch of ingredient objects that can keep track of what their prices and quantities were for that period. I figure it would be best to make the period primary keys their combined month and week, as that will be unique in the database.
I may add year on later, but that doesn't change my problem.
The database I'm working with is Postgres.
This is my period table model in my sequelize seed file:
.then(() => queryInterface.createTable('periods', {
month: {
type: Sequelize.INTEGER,
validate: {
max: 12,
min: 1
},
unique: "monthWeekConstraint",
primaryKey: true
},
week: {
type: Sequelize.INTEGER,
validate: {
max: 4,
min: 1
},
unique: "monthWeekConstraint",
primaryKey: true
},
createdAt: {
type: Sequelize.DATE
},
updtedAt: {
type: Sequelize.DATE
}
}))
I'd like to reference the periods stored in the above table in my periodItems table, which I have (incorrectly) looking like:
.then(() => queryInterface.createTable('periodItems', {
periodMonth: {
type: Sequelize.INTEGER,
references: {model: 'periods', key: 'monthWeekConstraint'}
},
periodWeek: {
type: Sequelize.INTEGER,
references: {model: 'periods', key: 'monthWeekConstraint'}
},
day: {
type: Sequelize.INTEGER,
validate: {
min: 1,
max: 7
}
},
...other irrelevant fields...
}))
I'm definitely new to databases, so I apologize if I'm way off. I've gotten a few other tables doing what I'd like, but I've been stuck on this problem for a few days.

Answer 1

While it is possible to create composite primary keys in Sequelize by specifying primaryKey: true against more than one column (as you have already done above), Sequelize doesn't currently support composite foreign keys, so there is no way to reference a model/table which has composite primary keys.
See https://github.com/sequelize/sequelize/issues/311 for a discussion on the subject.

Answer 2

model/product.js:
const Product = sequelize.define("product", {
sku: { type: Sequelize.STRING, allowNull: false, primaryKey: true },
title: { type: Sequelize.STRING, allowNull: false },
availability: {
type: Sequelize.STRING,
allowNull: false,
defaultValue: false,
}
});
model/Attribute.js:
const Attribute = sequelize.define("attribute", {
key: { type: Sequelize.STRING, allowNull: false, primaryKey: true },
productSku: { type: Sequelize.STRING, allowNull: false, primaryKey: true },
value: { type: Sequelize.STRING, allowNull: false },
});
After importing to app.js:
product.hasMany(attribute, { foreignKey: "productSku", sourceKey: "sku" });
attribute.belongsTo(product, { foreignKey: "productSku", targetKey: "sku" });
Explanation:
Product.sku is exported as foreign key to Attibute.productSku. Attribute table has a composite foreign (key + productSku), and a ForeignKey(productSku) from product.sku;