Wait for mongoose.find inside foreach loop inside callback - node.js

Question

How do I wait till data is populated in finalresult before going further?
I tried async and await but did not work as expected and on top of that I am new to nodejs express
exports.getporderlist = (req, res) => {
page = req.params.page || "1";
skip = (page - 1) * 10;
if (req.profile.role.includes(1)) {
Order.find({ status: { $in: [0, 2] } })
.select("_id updatedAt items salesman")
.populate("customer", "customer_name phone")
.sort({ updatedAt: -1 })
.skip(skip)
.limit(10)
.exec((err, orders) => {
if (err) {
return res.status(400).json({
error: "No Orders found",
});
}
let finalresult = [];
orders.forEach((oelement) => {
total = 0;
salesman = oelement.salesman.split(" ")[0];
itemscount = oelement.items.length;
placeorder = true;
oelement.items.forEach((element) => {
total += element.price * element.quantity;
});
//Wait for the bellow data variable to finish populating finalresult
const data = Design.find()
.select("_id sm lm")
.where("_id")
.in(oelement.items)
.exec((err, orders) => {
finalresult.push(orders);
console.log(orders);
});
});
console.log(1);
res.json(finalresult);//getting empty finalresult array on call
});
} else {
res.json({ Message: "Go away" });
}
};

Answer 1

The exec() function do returns promise, so you can user async/await to call it.
Your code will look like this:
exports.getporderlist = async (req, res) => {
try {
if (req.profile.role.includes(1)) {
page = Number(req.params.page) || 1;
skip = (page - 1) * 10;
const orders = await Order.find({
status: {
$in: [0, 2]
}
})
.select("_id updatedAt items salesman")
.populate("customer", "customer_name phone")
.sort({
updatedAt: -1
})
.skip(skip)
.limit(10)
.exec();
let finalresult = [];
for (const oelement of orders) {
let total = 0;
salesman = oelement.salesman.split(" ")[0];
itemscount = oelement.items.length;
placeorder = true;
oelement.items.forEach((element) => {
total += element.price * element.quantity;
});
const data = await Design.find()
.select("_id sm lm")
.where("_id")
.in(oelement.items)
.exec();
finalresult.push(data);
}
res.json(finalresult);
} else {
res.json({
Message: "Go away"
});
}
} catch (err) {
return res.status(400).json({
error: "No Orders found",
});
}
}
you can always call async functions with async/await inside for ..of loops. You can read more here
P.s. Couldn't get a chance to run the code.. Let me know if you have any doubts :)