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Get MongoDB documents that contains specific attributes in array
For this, you can use $and along with dot(.) notation. Let us first create a collection with documents −
>db.demo2.insertOne({"StudentInformation":[{"StudentName":"John","StudentAge":21},{"StudentName":"Mike","StudentAge":22}]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e08b56e25ddae1f53b62219")
}
>db.demo2.insertOne({"StudentInformation":[{"StudentName":"Carol","StudentAge":19},{"StudentName":"Bob","StudentAge":18}]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e08b58625ddae1f53b6221a")
}Following is the query to display all documents from a collection with the help of find() method −
> db.demo2.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e08b56e25ddae1f53b62219"),
"StudentInformation" : [
{
"StudentName" : "John",
"StudentAge" : 21
},
{
"StudentName" : "Mike",
"StudentAge" : 22
}
]
}
{
"_id" : ObjectId("5e08b58625ddae1f53b6221a"),
"StudentInformation" : [
{
"StudentName" : "Carol",
"StudentAge" : 19
},
{
"StudentName" : "Bob",
"StudentAge" : 18
}
]
}Following is the query to get documents that contains specific attributes in array−
>db.demo2.find({$and:[{"StudentInformation.StudentName":"Carol"},{"StudentInformation.StudentName":"Bob"}]});This will produce the following output −
{ "_id" : ObjectId("5e08b58625ddae1f53b6221a"), "StudentInformation" : [ { "StudentName" : "Carol", "StudentAge" : 19 }, { "StudentName" : "Bob", "StudentAge" : 18 } ] }
Updated on: 31-Mar-2020
411 Views
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