$ - Amazon DocumentDB
Example (MongoDB Shell)Code examples

$

The $ projection operator limits the contents of an array field to return only the first element that matches the query condition. It is used to project a single matching array element.

Parameters

  • field.$: The array field with the positional operator to project the first matching element.

Example (MongoDB Shell)

The following example demonstrates using the $ projection operator to return only the matching array element.

Create sample documents

db.students.insertMany([
  { _id: 1, name: "Alice", grades: [85, 92, 78, 95] },
  { _id: 2, name: "Bob", grades: [70, 88, 92, 65] },
  { _id: 3, name: "Charlie", grades: [95, 89, 91, 88] }
]);

Query example

db.students.find(
  { grades: { $gte: 90 } },
  { name: 1, "grades.$": 1 }
);

Output

{ "_id" : 1, "name" : "Alice", "grades" : [ 92 ] }
{ "_id" : 2, "name" : "Bob", "grades" : [ 92 ] }
{ "_id" : 3, "name" : "Charlie", "grades" : [ 95 ] }

In this example, only the first grade that is greater than or equal to 90 is returned for each student.

Code examples

To view a code example for using the $ projection operator, choose the tab for the language that you want to use:

Node.js
const { MongoClient } = require('mongodb');

async function example() {
  const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
  const db = client.db('test');
  const collection = db.collection('students');

  const result = await collection.find(
    { grades: { $gte: 90 } },
    { projection: { name: 1, "grades.$": 1 } }
  ).toArray();

  console.log(JSON.stringify(result, null, 2));
  await client.close();
}

example();
Python
from pymongo import MongoClient

def example():
    client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
    db = client['test']
    collection = db['students']

    result = list(collection.find(
        {'grades': {'$gte': 90}},
        {'name': 1, 'grades.$': 1}
    ))

    print(result)
    client.close()

example()