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Is it possible to exclude nested fields in MongoDB with a wildcard?
Achieve this with aggregation pipeline. Let us first create a collection with documents −
> db.demo413.insertOne(
... {
... "_id": "101",
... "details": {
... "Info1": {
... Name:"Chris",
... Age:21
... },
... "Info2": {
... Name:"David",
... Age:23
... }
... }
... }
... );
{ "acknowledged" : true, "insertedId" : "101" }Display all documents from a collection with the help of find() method −
> db.demo413.find();
This will produce the following output −
{ "_id" : "101", "details" : { "Info1" : { "Name" : "Chris", "Age" : 21 }, "Info2" : { "Name" : "David", "Age" : 23 } } }Following is the query to exclude nested fields −
> db.demo413.aggregate([
... { $project: { "details" : { $objectToArray: "$details" } } },
... { $project: { "details.v.Age" : 0} },
... { $project: { "details" : { $arrayToObject: "$details"} } }
... ]);This will produce the following output −
{ "_id" : "101", "details" : { "Info1" : { "Name" : "Chris" }, "Info2" : { "Name" : "David" } } }
Updated on: 03-Apr-2020
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