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Increment a field in MongoDB document which is embedded?
Let’s say, here we are incrementing StudentScores for MongoDB which is inside StudentDetails −
... "StudentScores": {
... "StudentMathScore": 90,
... "StudentMongoDBScore": 78
... }Let us first create a collection with documents −
> db.embeddedValueIncrementDemo.insertOne(
... {
... "StudentDetails": {
... "StudentScores": {
... "StudentMathScore": 90,
... "StudentMongoDBScore": 78
... }
... }
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd2b670345990cee87fd896")
}Following is the query to display all documents from a collection with the help of find() method −
> db.embeddedValueIncrementDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd2b670345990cee87fd896"),
"StudentDetails" : {
"StudentScores" : {
"StudentMathScore" : 90,
"StudentMongoDBScore" : 78
}
}
}Following is the query to increment embedded value. Here, we are incrementing StudentMongoDBScore −
> db.embeddedValueIncrementDemo.update({ _id: new ObjectId("5cd2b670345990cee87fd896") }, { $inc: { "StudentDetails.StudentScores.StudentMongoDBScore": 20 } }, { upsert: true, safe: true }, null);
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check all the documents once again −
> db.embeddedValueIncrementDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd2b670345990cee87fd896"),
"StudentDetails" : {
"StudentScores" : {
"StudentMathScore" : 90,
"StudentMongoDBScore" : 98
}
}
}
Updated on: 30-Jul-2019
113 Views
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