Currently, I am tackling a project for an interview where I need to implement an endpoint that allows me to POST an array of products (listings) and have them created or updated accordingly using MongoDB and Mongoose. The issue I am facing revolves around handling Promises correctly as I keep encountering a timeout error during testing. Here is the task in question:
it.only('should create listings or update them if they already exist, incrementing the quantity with the difference ' +
'between the current sold_quantity and the initial_sold_quantity', (done) => {
var iPhone = { ... };
var samsung = { ... };
request(app).post('/listings/myEndpoint').send([iPhone, samsung]).expect(200, {
created: 1,
updated: 1
}, done);
});
exports.myEndpoint = (req, res) => {
var listings = req.body;
var created, updated = 0;
listings.forEach(reqListing => {
Listing.findOne({ listing_id: reqListing.listing_id })
.then(foundListing => {
if (!foundListing) {
var newListing = reqListing;
newListing.initial_sold_quantity = newListing.sold_quantity;
Listing.create(newListing);
created++;
} else {
var newQuantity = reqListing.sold_quantity - foundListing._doc.initial_sold_quantity;
if (foundListing._doc.quantity != newQuantity) {
foundListing._doc.quantity = newQuantity;
foundListing.save();
updated++;
}
}
});
return {
created: created,
updated: updated
};
});
};
MY TROUBLESHOOTING EFFORTS:
Extending time limit. I attempted adjusting the default timeout for Mocha tests, but regardless of whether it's set to 2 seconds or 20 seconds, the test still times out.
Separating creation and updates. Even when isolating either action, be it solely updating or creating a product, the timeout remains persistent.
Streamlining logic. Regardless of the code inside the if/else blocks, the timeout persistently occurs. Therefore, even with simplified code like this:
exports.myEndpoint = (req, res) => {
var listings = req.body;
var created, updated = 0;
listings.forEach(reqListing => {
Listing.findOne({ listing_id: reqListing.listing_id })
.then(foundListing => {
if (!foundListing) {
console.log("creating");
} else {
console.log("updating");
}
});
return {
created: created,
updated: updated
};
});
};
The timeout issue persists.