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MongoDB query to add a new field and concatenate the price result divided by a specific number in it
To add a new field, use the $addFields in MongoDB. Let us create a collection with documents −
> db.demo719.insertOne(
... {
... "Number":"7374644",
... "details" : {
... "otherDetails" : [
... {
... "ProductId" :"102",
... "ProductPrice" : NumberInt(500)
... },
... {
... "ProductId" :"103",
... "ProductPrice" : NumberInt(2000)
... }
... ]
... }
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5eaae56c43417811278f5882")
}Display all documents from a collection with the help of find() method −
> db.demo719.find();
This will produce the following output −
{ "_id" : ObjectId("5eaae56c43417811278f5882"), "Number" : "7374644", "details" : { "otherDetails" : [ { "ProductId" : "102", "ProductPrice" : 500 }, { "ProductId" : "103", "ProductPrice" : 2000 } ] } }Following is the query to add a new field and concatenate the price result divided by a specific number in it −
> db.demo719.aggregate([
... {
... $addFields:{
... productPriceList: {
... $reduce: {
... input: {
... $map: {
... input: "$details.otherDetails.ProductPrice",
... in: { $toString: { $divide: ["$$this", 5] } }
... }
... },
... initialValue: "",
... in: { $concat: ["$$value", "$$this", "
"] }
... }
... }
... }
... },
... {
... $project: {
... _id: 0,
... Number:1,
... productPriceList:1
... }
... }
... ])This will produce the following output −
{ "Number" : "7374644", "productPriceList" : "100
400
" }
Updated on: 15-May-2020
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