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How to remove element in a MongoDB array?
To remove an element, update, and use $pull in MongoDB. The $pull operator removes from an existing array all instances of a value or values that match a specified condition.
Let us first create a collection with documents −
db.demo541.insertOne({"software":{"services":["gmail","facebook","yahoo"]}});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8ca845ef4dcbee04fbbc11")
}
> db.demo541.insertOne({"software":{"services":["whatsapp","twitter"]}});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8ca85cef4dcbee04fbbc12")
}Display all documents from a collection with the help of find() method −
> db.demo541.find();
This will produce the following output −
{ "_id" : ObjectId("5e8ca845ef4dcbee04fbbc11"), "software" : { "services" : [ "gmail", "facebook", "yahoo" ] } }
{ "_id" : ObjectId("5e8ca85cef4dcbee04fbbc12"), "software" : { "services" : [ "whatsapp", "twitter" ] } } Following is the query to remove an element in a MongoDB array −
> db.demo541.update({ _id: ObjectId("5e8ca845ef4dcbee04fbbc11") },
... { $pull: { 'software.services': "yahoo" }}
... );
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo541.find();
This will produce the following output −
{ "_id" : ObjectId("5e8ca845ef4dcbee04fbbc11"), "software" : { "services" : [ "gmail", "facebook" ] } }
{ "_id" : ObjectId("5e8ca85cef4dcbee04fbbc12"), "software" : { "services" : [ "whatsapp", "twitter" ] } }
Updated on: 14-May-2020
16K+ Views
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