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Filtering MongoDB items by fields and subfields?
To filter items by fields and subfields, use dot notation. Let us create a collection with documents −
> db.demo638.insert({Name:"Chris"});
WriteResult({ "nInserted" : 1 })
> db.demo638.insert({Name:"David",details:{Subject:"MongoDB"}});
WriteResult({ "nInserted" : 1 })Display all documents from a collection with the help of find() method −
> db.demo638.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5e9c28666c954c74be91e6de"), "Name" : "Chris" }
{
"_id" : ObjectId("5e9c28866c954c74be91e6df"),
"Name" : "David",
"details" : {
"Subject" : "MongoDB"
}
}Following is the query to filter items by multiple fields and subfields −
> db.demo638.find({"details.Subject":null});This will produce the following output −
{ "_id" : ObjectId("5e9c28666c954c74be91e6de"), "Name" : "Chris" }
Updated on: 12-May-2020
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