Async/await func in another async/await func in Node.js, MongoDB - node.js

Question

I am trying to search available objects of a MongoDB collection(e.g. ParkingSpot) using specific business logic, the problem is that inside this function which is an async/await func I am looking inside another collection with .find() which I use as an async/await as well. The second function doesn't execute and gets back as an promise " Promise { } " and therefore the business logic is not applied. Can you help me please?
Here is 1st function:
exports.get_parkingSpots_avail_for_parking = async (req, res, next) => {
try {
const radius = req.body.radius;
const userLatitude = req.body.userLatitude;
const userLongitude = req.body.userLongitude;
const reqStartDate = new Date(req.body.reqStartDate);
const reqEndDate = new Date(req.body.reqEndDate);
const parkingSpots = await ParkingSpot.find({
isAvailable: true
}, (err, parkingSpots) => {
if (err) {
return res.status(500).json({
error: err
});
}
const freeParkingSpots = parkingSpots.filter(parkingSpot => {
return distanceCalculator(parkingSpot.latitude, parkingSpot.longitude, userLatitude, userLongitude) < radius
})
const availParkingSpots = freeParkingSpots.filter( freeParkingSpot => {
// console.log(freeParkingSpot._id);
console.log(isParkingAvailable(reqStartDate, reqEndDate, freeParkingSpot._id));
return isParkingAvailable(reqStartDate, reqEndDate, freeParkingSpot._id);
})
}).select('_id userId number address latitude longitude notes isAvailable startOfAvailability endOfAvailability');
console.log(parkingSpots);
if (parkingSpots.length > 0) {
return res.status(200).json({
parkingSpots: parkingSpots
});
}
return res.status(404).json({
message: "No available parking spots for requeste period"
});
} catch (err) {
res.status(500).json({
error: err
})
}
};
Second function which is being called :
module.exports = async function isParkingAvailable(reqStartDate, reqEndDate, parkingSpotId) {
const parkingSpotBookings = await Booking.find({ parkingSpotId: parkingSpotId})
.select('_id parkingSpotId sharerUserId renterUserId startDate endDate');
if (parkingSpotBookings.length == 0) {
return true;
}
parkingSpotBookings.filter(booking => {
//console.log(parkingSpotId);
//console.log("Is overlapping" +!isOverlapping(reqStartDate, reqEndDate, booking.startDate, booking.endDate));
return !isOverlapping(reqStartDate, reqEndDate, booking.startDate, booking.endDate)
})
}
So the problem is that calling second function appears as that in console.log :Promise { }

Answer 1

Await will Return the result to your parkingSpot variable.
For the second function:
You have defined this function as an async, that means it is holding asynchronous process, and in Node JS es6 async process is processed as a promise, so if you won't call it with await it will return a promise only
exports.get_parkingSpots_avail_for_parking = async (req, res, next) => {
try {
const radius = req.body.radius;
const userLatitude = req.body.userLatitude;
const userLongitude = req.body.userLongitude;
const reqStartDate = new Date(req.body.reqStartDate);
const reqEndDate = new Date(req.body.reqEndDate);
const parkingSpots = await ParkingSpot.find({isAvailable: true}).select('_id userId number address latitude longitude notes isAvailable startOfAvailability endOfAvailability');
const freeParkingSpots = parkingSpots.filter(parkingSpot => {
return distanceCalculator(parkingSpot.latitude, parkingSpot.longitude, userLatitude, userLongitude) < radius
});
const availParkingSpots = freeParkingSpots.filter( async freeParkingSpot => {
/* You have defined this function as an async, that means it is holding asynchronous process, and in
Node JS es6 async process is processed as a promise, so if you won't call it with await it will return a promise only */
return await isParkingAvailable(reqStartDate, reqEndDate, freeParkingSpot._id);
});
if (parkingSpots.length > 0) {
return res.status(200).json({
parkingSpots: parkingSpots
});
}
return res.status(404).json({
message: "No available parking spots for requeste period"
});
} catch (err) {
res.status(500).json({
error: err
})
}
};
I hope it will help you.
Thank you