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In MongoDB how do you use $set to update a nested value/embedded document?
The syntax is as follows for this −
db.yourCollectionName.update({ }, { $set: { "yourOuterFieldName.yourInnerFieldName": "yourValue" } });To understand the syntax, let us create a collection with the document. The query to create a collection with a document is as follows −
> db.updateNestedValueDemo.insertOne({"CustomerName":"Chris",
... "CustomerDetails":{"CustomerAge":25,"CustomerCompanyName":"Google","CustomerCityName":"US"}});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8fccc4d3c9d04998abf015")
}Display all documents from a collection with the help of find() method. The query is as follows −
> db.updateNestedValueDemo.find().pretty();
The following is the output −
{
"_id" : ObjectId("5c8fccc4d3c9d04998abf015"),
"CustomerName" : "Chris",
"CustomerDetails" : {
"CustomerAge" : 25,
"CustomerCompanyName" : "Google",
"CustomerCityName" : "US"
}
}Here is the query to use $set to update a nested value/embedded document −
> db.updateNestedValueDemo.update({ }, { $set: { "CustomerDetails.CustomerCompanyName": "Dell" } });
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check the documents from a collection using find() method −
> db.updateNestedValueDemo.find().pretty();
The following is the output −
{
"_id" : ObjectId("5c8fccc4d3c9d04998abf015"),
"CustomerName" : "Chris",
"CustomerDetails" : {
"CustomerAge" : 25,
"CustomerCompanyName" : "Dell",
"CustomerCityName" : "US"
}
}Look at the above sample output, the nested field “CustomerCompanyName” has been changed from “Google” to “Dell”.
Updated on: 30-Jul-2019
1K+ Views
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