MongoDB Array Update Operator - $pullAll

Description

In MongoDB, the $pullAll operator is used to remove multiple values specified with $pullAll operator.

Syntax:

db.collection.update( { field: value }, { $pullAll: { field1: [ value1, value2, value3 ] } } );

Parameters:

Sample collection "student"

{
        "_id" : 1,
        "sem" : 1,
        "subjects" : [
                "phys",
                "chem",
                "maths",
                "gkn",
                "stat",
                "astro"
        ],
        "achieve" : [
                70,
                87,
                90,
                90,
                65,
                81
        ]
}

Example of MongoDB $pullAll operator

If we want to remove the elements [ 65,87,90] specified as argument with $pullAll operator from the the array field subjects for any instance in this array is "maths", the following mongodb command can be used -

> db.student.update( { "subjects" : "gkn" }, { $pullAll: { "achieve": [65,87,90] }} );

Here in the above example the element "maths" in the array subjects will be remove, because the condition

To see the newly updated document -

> db.student.find().pretty();

Output of the command:

{
        "_id" : 1,
        "achieve" : [
                70,
                81
        ],
        "sem" : 1,
        "subjects" : [
                "phys",
                "chem",
                "maths ",
                "gkn",
                "stat",
                "astro"
        ]
}

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