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Updating nested document in MongoDB
To update the nested document, use $set. Let us create a collection with documents −
> db.demo315.insertOne({ _id :101,
... details: [
... {Name: 'Chris', subjects: [{id:1001, SubjectName:"MySQL"}]}
... ]
... }
...)
{ "acknowledged" : true, "insertedId" : 101 }Display all documents from a collection with the help of find() method −
> db.demo315.find().pretty();
This will produce the following output −
{
"_id" : 101,
"details" : [
{
"Name" : "Chris",
"subjects" : [
{
"id" : 1001,
"SubjectName" : "MySQL"
}
]
}
]
}Following is the query to update the nested document in MongoDB −
> db.demo315.update ({_id:101}, { '$set': {"details.0.subjects.1.id" :1004} })
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo315.find().pretty();
This will produce the following output −
{
"_id" : 101,
"details" : [
{
"Name" : "Chris",
"subjects" : [
{
"id" : 1001,
"SubjectName" : "MySQL"
},
{
"id" : 1004
}
]
}
]
}
Updated on: 02-Apr-2020
232 Views
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