$or - Amazon DocumentDB
Example (MongoDB Shell)Code examples
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$or

The $or aggregation operator evaluates multiple expressions and returns true if at least one expression evaluates to true. It returns false only if all expressions are false.

Parameters

  • expressions: An array of expressions to evaluate.

Example (MongoDB Shell)

The following example demonstrates using the $or operator to check if products meet any of multiple criteria.

Create sample documents

db.items.insertMany([
  { _id: 1, name: "Widget", price: 150, onSale: false },
  { _id: 2, name: "Gadget", price: 45, onSale: false },
  { _id: 3, name: "Tool", price: 200, onSale: true }
]);

Query example

db.items.aggregate([
  {
    $project: {
      name: 1,
      price: 1,
      onSale: 1,
      goodDeal: {
        $or: [
          { $lt: ["$price", 50] },
          { $eq: ["$onSale", true] }
        ]
      }
    }
  }
]);

Output

[
  { _id: 1, name: 'Widget', price: 150, onSale: false, goodDeal: false },
  { _id: 2, name: 'Gadget', price: 45, onSale: false, goodDeal: true },
  { _id: 3, name: 'Tool', price: 200, onSale: true, goodDeal: true }
]

Code examples

To view a code example for using the $or aggregation 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('items');

  const result = await collection.aggregate([
    {
      $project: {
        name: 1,
        price: 1,
        onSale: 1,
        goodDeal: {
          $or: [
            { $lt: ["$price", 50] },
            { $eq: ["$onSale", true] }
          ]
        }
      }
    }
  ]).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['items']

    result = list(collection.aggregate([
        {
            '$project': {
                'name': 1,
                'price': 1,
                'onSale': 1,
                'goodDeal': {
                    '$or': [
                        { '$lt': ['$price', 50] },
                        { '$eq': ['$onSale', True] }
                    ]
                }
            }
        }
    ]))

    print(result)
    client.close()

example()