The code to get couponId from document:
function getLatestCouponId() {
var cursor = db.collection('Coupon').find().limit(1).sort({ $natural : -1 });
cursor.count(function(error, nbDocs) {
if (error) throw error;
if(nbDocs == 0){
couponId=1;
insertData();
}
else if(nbDocs==1){
cursor.toArray(function(err, docs) {
if (err) throw err;
console.log('%j', docs);
couponId = docs[0].couponId;
});
insertData();
}
});
}
The above code tries to find the latest document in the collection coupon and find its coupon id column but unfortunately coupon id is returning null console.log prints log as:
[{"_id":"5a819ae4ee37582288837c9f","couponId":90,"district":"Thiruvananthapuram","taluk":"Thiruvananthapuram","landmark":"SCTIMST"}]
The code showing how I inserted docs into the collection is given below:
function insertData(){
console.log("No of Coupons" + totalCoupon);
//var newLandMark = { "hotelName": hotelName, "district": district, "taluk": taluk, "landmark":landmark, "dateCreation": new Date(),
//};
for(i=0;i<totalCoupon;i++){
var doc ={"couponId":couponId, "district":district, "taluk":taluk, "landmark":landmark};
docs.push(doc);
couponId=couponId+1;;
}
db.collection('Coupon').insertMany(docs, {w: 1}, function(err, records){
var itemsProcessed = 0;
if (err) throw err;
else{
rdata["status"] = "ok";
callback();
}
});
}
