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Increment value of an array element with array object in MongoDB
To increment the value of an array object, use $inc. Let us create a collection with documents −
>db.demo506.insertOne({"details":[{id:1,Quantity:4},{id:2,Quantity:3},{id:3,Quantity:2},{id:4,Qua ntity:7}]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e882ed6987b6e0e9d18f576")
}Display all documents from a collection with the help of find() method −
> db.demo506.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e882ed6987b6e0e9d18f576"),
"details" : [
{
"id" : 1,
"Quantity" : 4
},
{
"id" : 2,
"Quantity" : 3
},
{
"id" : 3,
"Quantity" : 2
},
{
"id" : 4,
"Quantity" : 7
}
]
}Following is the query to increment the value of an array element name quantity with array object −
> db.demo506.update({"details.id":2},{$inc:{"details.$.Quantity":10}});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo506.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e882ed6987b6e0e9d18f576"),
"details" : [
{
"id" : 1,
"Quantity" : 4
},
{
"id" : 2,
"Quantity" : 13
},
{
"id" : 3,
"Quantity" : 2
},
{
"id" : 4,
"Quantity" : 7
}
]
}
Updated on: 13-May-2020
603 Views
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