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How to get the matching document inside an array in MongoDB?
To get the matching document, use $elemMatch. Let us first create a collection with documents −
> db.getMatchingDocumentDemo.insertOne(
{
_id :1,
"UserDetails":[
{
"UserName":"John",
"UserAge":23
}
]
}
);
{ "acknowledged" : true, "insertedId" : 1 }
> db.getMatchingDocumentDemo.insertOne( { _id :2, "UserDetails":[ { "UserName":"Larry", "UserAge":24 } ] } );
{ "acknowledged" : true, "insertedId" : 2 }Following is the query to display all documents from a collection with the help of find() method −
> db.getMatchingDocumentDemo.find().pretty();
This will produce the following output −
{
"_id" : 1,
"UserDetails" : [
{
"UserName" : "John",
"UserAge" : 23
}
]
}
{
"_id" : 2,
"UserDetails" : [
{
"UserName" : "Larry",
"UserAge" : 24
}
]
}Following is the query to get the matching document inside an array in MongoDB −
> db.getMatchingDocumentDemo.find({UserDetails: {$elemMatch: {UserAge: 24}}});This will produce the following output −
{ "_id" : 2, "UserDetails" : [ { "UserName" : "Larry", "UserAge" : 24 } ] }
Updated on: 30-Jul-2019
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