Articles → MONGODB → $Push, $Pull, And $Pop Operators In Mongodb

$Push, $Pull, And $Pop Operators In Mongodb

In this article, we will discuss the $push, $pull, and $pop operators in MongoDB.

Sample Collection

Consider the following collection that will be used for all the operators.

Picture showing the sample document collection in mongodb

$Push Operator

The $push operator is used to add an element at the end of an array. The query would be: -

db.mycollection.updateOne(
    { name: "Jane Smith" },
    { $push: { hobbies: "Running" } }
)

In the above query, we are adding an element Running in the hobbies array where the name is Jane Smith.

Picture showing executing the $push operator in mongodb

The element is added to the array.

Picture showing the output of $push operator in mongodb

Pushing Multiple Values In An Array

For pushing multiple values in an array, we use $each with the $push operator. The syntax is: -

db.collection.updateOne(
   { _id: ObjectId("document_id") }, // Match condition to identify the document
   { $push: { arrayField: { $each: [ value1, value2, ... ] } } }
)

In the above sample collection, we will use the following query: -

db.mycollection.updateOne(
   { _id: ObjectId("6597b8a02695219f3c55e481") }, 
   { $push: { hobbies: { $each: [ 'Cycling', 'Painting' ] } } }
)

Picture showing inserting multiple values in an array using the $push and $each operators

This is the collection after pushing multiple values.

Picture showing multiple values inserted in an array using the $push and $each operators

$Pull Operator

The $pull operator is used to remove an element from an array. Consider the above collection. To remove the element, use the following query: -

db.mycollection.updateOne(
    { name: "Jane Smith" },
    { $pull: { hobbies: "Running" } }
)

Picture showing the output of $pull operator in mongodb

$Pop Operator

The $pop operator is used to remove elements from the beginning or end of an array.

The syntax is: -

{ $pop: { <field>: 1 } }: Removes the last element of the array.
{ $pop: { <field>: -1 } }: Removes the first element of the array.

In the above collection, if we want to remove the element from the hobbies array. The query would be: -

db.mycollection.updateOne(
    { name: 'John Doe' },
    { $pop: { hobbies: 1 } }
)

Picture showing removing the element from an array using the $pop operator

The collection after executing the $pop operator is: -

Picture showing the output of $pop operator in mongodb

Posted By -	Karan Gupta

Posted On -	Thursday, March 28, 2024

Updated On -	Wednesday, April 3, 2024

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