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How to exclude array type field value in MongoDB?
To exclude array type field value, use delete() in MongoDB. Let us create a collection with documents −
> db.demo464.insertOne(
... {
...
... "id" : "101",
... "details": [
... {
... Name:"Chris"
... },
... {
... Name:"David"
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e7f8832cb66ccba22cc9dda")
}Display all documents from a collection with the help of find() method −
> db.demo464.find();
This will produce the following output −
{ "_id" : ObjectId("5e7f8832cb66ccba22cc9dda"), "id" : "101", "details" : [ { "Name" : "Chris" }, {
"Name" : "David" } ] }Following is the query to exclude array type field values −
> db.demo464.find({id: "101"}).forEach(function(mongoDocument) {
...
... var details = mongoDocument.details;
... for(var j = 0; j − details.length; ++j) {
... var array = details[j];
... delete (array["Name"]);
...
... }
... db.demo464.save(mongoDocument);
... });Display all documents from a collection with the help of find() method −
> db.demo464.find();
This will produce the following output −
{ "_id" : ObjectId("5e7f8832cb66ccba22cc9dda"), "id" : "101", "details" : [ { }, { } ] }
Updated on: 11-May-2020
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