Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

$allElementsTrue

New from version 4.0

The $allElementsTrue operator is used to check if all elements in an array evaluate to a true value.

Parameters

Example (MongoDB Shell)

The following example demonstrates the usage of $allElementsTrue to check if all elements in an array are true.

Create sample documents

db.collection.insert([
  { "name": "John", "scores": [100, 90, 80] },
  { "name": "Jane", "scores": [80, 85, 0] },
  { "name": "Bob", "scores": [90, 95, null] }
])

Query example

db.collection.find({
  "scores": { "$allElementsTrue": [{ "$gt": 0 }] }
})

Output

[
  { "_id" : ObjectId("..."), "name" : "John", "scores" : [ 100, 90, 80 ] },
  { "_id" : ObjectId("..."), "name" : "Bob", "scores" : [ 90, 95, null ] }
]

In this example, the query checks if all elements in the scores array are greater than 0. The document with "name": "Jane" is excluded because the scores array contains a 0, which is a falsy value.

Code examples

To view a code example for using the $allElementsTrue command, 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('collection');

  const result = await collection.find({
    "scores": { "$allElementsTrue": [{ "$gt": 0 }] }
  }).toArray();

  console.log(result);

  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['collection']

    result = list(collection.find({
        "scores": {"$allElementsTrue": [{"$gt": 0}]}
    }))

    print(result)

    client.close()

example()