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Manipulating subdocuments in MongoDB
To manipulate subdocuments, use dot(.) notation in MongoDB. Let us first create a collection with documents −
> db.demo378.insertOne(
... {
... Name: 'Chris',
... details:[
... {id:101,Score:56},
... {id:102,Score:78}
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e5a758a2ae06a1609a00b0f")
}Display all documents from a collection with the help of find() method −
> db.demo378.find();
This will produce the following output −
{
"_id" : ObjectId("5e5a758a2ae06a1609a00b0f"), "Name" : "Chris", "details" : [
{ "id" : 101, "Score" : 56 }, { "id" : 102, "Score" : 78 }
]
}Following is the query to manipulate subdocuments −
> db.demo378.update({Name: "Chris", "details.id":102 }, { $inc: { "details.$.Score": -8 } });
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo378.find();
This will produce the following output −
{
"_id" : ObjectId("5e5a758a2ae06a1609a00b0f"), "Name" : "Chris", "details" : [
{ "id" : 101, "Score" : 56 }, { "id" : 102, "Score" : 70 }
]
}
Updated on: 02-Apr-2020
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