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Update key value where different key equals some value in MongoDB?
Let us create a collection with documents −
> db.demo196.insertOne(
... {
...
... "Id" : "101",
... "details" : [
... {
... "FirstName" : "Chris",
... "LastName" : "Brown",
... "Score" : 45
... },
... {
... "FirstName" : "David",
... "LastName" : "Miller",
... "Score" : 87
... },
... {
... "FirstName" : "John",
... "LastName" : "Doe",
... "Score" : 56
... }
... ]
... }
...);
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3af6b103d395bdc21346d7")
}Display all documents from a collection with the help of find() method −
> db.demo196.find();
This will produce the following output −
{
"_id" : ObjectId("5e3af6b103d395bdc21346d7"), "Id" : "101", "details" : [
{ "FirstName" : "Chris", "LastName" : "Brown", "Score" : 45 },
{ "FirstName" : "David", "LastName" : "Miller", "Score" : 87 },
{ "FirstName" : "John", "LastName" : "Doe", "Score" : 56 }
]
}Following is the query to update key value where different key equals some value −
> db.demo196.update({"details":{"$elemMatch":{"FirstName" : "David", "LastName" : "Miller"}}},
... {"$set":{"details.$.Score":98}});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo196.find();
This will produce the following output −
{
"_id" : ObjectId("5e3af6b103d395bdc21346d7"), "Id" : "101", "details" : [
{ "FirstName" : "Chris", "LastName" : "Brown", "Score" : 45 },
{ "FirstName" : "David", "LastName" : "Miller", "Score" : 98 },
{ "FirstName" : "John", "LastName" : "Doe", "Score" : 56 }
]
}
Updated on: 27-Mar-2020
391 Views
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