Sequelize create belongTo instance with reference - node.js

Question

I'm using Sequelize for my new NodeJs project
I defined two models: BusinessUnit and Store with this association: Store.belongsTo(BusinessUnit);
module.test_data_insertion = function() {
models.BusinessUnit.findOne({
where: {
BUID: "001"
}
}).then(element => {
fs.readdirSync(dir).forEach(function(file) {
var contents = fs.readFileSync(dir + file);
var jsonContent = JSON.parse(contents);
models.Store.create({
StoreId: jsonContent.StoreId,
StoreName: jsonContent.StoreName,
businessUnitId: element.id
});
});
});
};
I don't find to right way to reference the element in my Store, I would like something like this where I don't have to reference an id field directly
module.test_data_insertion = function() {
models.BusinessUnit.findOne({
where: {
BUID: "001"
}
}).then(element => {
fs.readdirSync(dir).forEach(function(file) {
var contents = fs.readFileSync(dir + file);
var jsonContent = JSON.parse(contents);
models.Store.create({
StoreId: jsonContent.StoreId,
StoreName: jsonContent.StoreName,
businessUnit: element
});
});
});
};
It should be simple but I don't see it. Thanks

Answer 1

Assuming your association are setup correctly, you are looking for something like this:
module.test_data_insertion = function() {
models.BusinessUnit.findOne({
where: {
BUID: "001"
}
}).then(element => {
fs.readdirSync(dir).forEach(function(file) {
var contents = fs.readFileSync(dir + file);
var jsonContent = JSON.parse(contents);
element.setStore({
StoreId: jsonContent.StoreId,
StoreName: jsonContent.StoreName,
});
});
});
};
please read belongsTo from doc which enables a set method,
However please note if this is a one to many relationship(one business unit with many stores) you may need to switch to belongsToMany it has add method. because setStore would override previous set.
Also, i'm not sure if any of those method would work inside .forEach correctly since they are promise, you may need to switch to a traditional for loop.