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Replace an array field value with MongoDB?
You can use positional operator $. Let us first create a collection with documents −
> db.replaceAnArrayFieldValueDemo.insertOne({"StudentTechnicalSubjects":["MySQL","SQL Server","PL/SQL"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cea41e0ef71edecf6a1f68f")
}Following is the query to display all documents from a collection with the help of find() method −
> db.replaceAnArrayFieldValueDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cea41e0ef71edecf6a1f68f"),
"StudentTechnicalSubjects" : [
"MySQL",
"SQL Server",
"PL/SQL"
]
}Following is the query to replace an array field value. Here, we are updating “SQL Server” with “MongoDB” −
> db.replaceAnArrayFieldValueDemo.update(
{"StudentTechnicalSubjects":"SQL Server"},
{ $set: { 'StudentTechnicalSubjects.$': "MongoDB" }}
);
WriteResult({ "nMatched" : 0, "nUpserted" : 0, "nModified" : 0 })Let us check the document once again −
> db.replaceAnArrayFieldValueDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cea41e0ef71edecf6a1f68f"),
"StudentTechnicalSubjects" : [
"MySQL",
"MongoDB",
"PL/SQL"
]
}
Updated on: 30-Jul-2019
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