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Filter by several array elements in MongoDB?
For this, you can use $elemMatch operator. The $elemMatch operator matches documents that contain an array field with at least one element that matches all the specified query criteria. Let us first create a collection with documents −
> db.filterBySeveralElementsDemo.insertOne(
"_id":100,
"StudentDetails": [
{
"StudentName": "John",
"StudentCountryName": "US",
},
{
"StudentName": "Carol",
"StudentCountryName": "UK"
}
]
}
);
{ "acknowledged" : true, "insertedId" : 100 }
> db.filterBySeveralElementsDemo.insertOne(
{
"_id":101,
"StudentDetails": [
{
"StudentName": "Sam",
"StudentCountryName": "AUS",
},
{
"StudentName": "Chris",
"StudentCountryName": "US"
}
]
}
);
{ "acknowledged" : true, "insertedId" : 101 }Following is the query to display all documents from a collection with the help of find() method −
> db.filterBySeveralElementsDemo.find().pretty();
This will produce the following output −
{
"_id" : 100,
"StudentDetails" : [
{
"StudentName" : "John",
"StudentCountryName" : "US"
},
{
"StudentName" : "Carol",
"StudentCountryName" : "UK"
}
]
}
{
"_id" : 101,
"StudentDetails" : [
{
"StudentName" : "Sam",
"StudentCountryName" : "AUS"
},
{
"StudentName" : "Chris",
"StudentCountryName" : "US"
}
]
}Following is the query to filter by several array elements −
> db.filterBySeveralElementsDemo.find({ StudentDetails: { $elemMatch: { StudentName: 'Sam', StudentCountryName: 'AUS' }}}).pretty();This will produce the following output −
{
"_id" : 101,
"StudentDetails" : [
{
"StudentName" : "Sam",
"StudentCountryName" : "AUS"
},
{
"StudentName" : "Chris",
"StudentCountryName" : "US"
}
]
}
Updated on: 30-Jul-2019
108 Views
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