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(PDF).
$each
The $each operator is used in conjunction with other update operators, such as $push and $addToSet, to add multiple values to an array field. It allows adding multiple elements to an array in a single operation, rather than having to execute multiple update operations.
Parameters
Example (MongoDB Shell)
The following example demonstrates using the $each operator with the $push operator to add multiple elements to an array field.
Create sample documents
db.fruits.insertOne({
_id: 1,
fruits: ["apple", "banana"]
})
Query example
db.fruits.updateOne(
{ _id: 1 },
{ $push: { fruits: { $each: ["cherry", "durian", "elderberry"] } } }
)
View updated document
db.fruits.findOne({ _id: 1 })
Output
{
_id: 1,
fruits: [ 'apple', 'banana', 'cherry', 'durian', 'elderberry' ]
}
Code examples
To view a code example for using the $each 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('fruits');
await collection.updateOne(
{ _id: 1 },
{ $push: { fruits: { $each: ["cherry", "durian", "elderberry"] } } }
);
await client.close();
}
example();
- Python
-
from pymongo import MongoClient
def example():
client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
db = client['test']
collection = db['fruits']
collection.update_one(
{'_id': 1},
{'$push': {'fruits': {'$each': ['cherry', 'durian', 'elderberry']}}}
)
client.close()
example()