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Match multiple criteria inside an array with MongoDB?
For this, use aggregate framework with the $elemMatch operator. Let us first create a collection with documents −
> db.matchMultipleCriteriaDemo.insertOne({
"EmployeeDetails": [
{"EmployeeName": "Chris", "Salary": 45000, "Language":"Java"},
{"EmployeeName": "Robert", "Salary": 41000, "Language":"Python"}
]
});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cea3bf0ef71edecf6a1f689")
}
> db.matchMultipleCriteriaDemo.insertOne({
"EmployeeDetails": [
{"EmployeeName": "David", "Salary": 55000, "Language":"C++"},
{"EmployeeName": "Bob", "Salary": 61000, "Language":"C"}
]
});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cea3bf1ef71edecf6a1f68a")
}Following is the query to display all documents from a collection with the help of find() method −
> db.matchMultipleCriteriaDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cea3bf0ef71edecf6a1f689"),
"EmployeeDetails" : [
{
"EmployeeName" : "Chris",
"Salary" : 45000,
"Language" : "Java"
},
{
"EmployeeName" : "Robert",
"Salary" : 41000,
"Language" : "Python"
}
]
}
{
"_id" : ObjectId("5cea3bf1ef71edecf6a1f68a"),
"EmployeeDetails" : [
{
"EmployeeName" : "David",
"Salary" : 55000,
"Language" : "C++"
},
{
"EmployeeName" : "Bob",
"Salary" : 61000,
"Language" : "C"
}
]
}Following is the query to match multiple criteria inside an array −
> db.matchMultipleCriteriaDemo.aggregate({ "$match": { "EmployeeDetails": { "$elemMatch": { "EmployeeName": "Bob", "Language":"C" } } }} ).pretty();This will produce the following output −
{
"_id" : ObjectId("5cea3bf1ef71edecf6a1f68a"),
"EmployeeDetails" : [
{
"EmployeeName" : "David",
"Salary" : 55000,
"Language" : "C++"
},
{
"EmployeeName" : "Bob",
"Salary" : 61000,
"Language" : "C"
}
]
}
Updated on: 30-Jul-2019
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