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How to pull value from array of ObjectIDs in MongoDB?
To pull value from array of ObjectIDs, use $pull in MongoDB. Let us create a collection with documents −
> db.demo258.insertOne({"arrayOfObjectsId":[ ObjectId("5e47a5e81627c0c63e7dba92"),ObjectId("5e47a5e51627c0c63e7dba91")]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e47a8211627c0c63e7dba97")
}Display all documents from a collection with the help of find() method −
> db.demo258.find();
This will produce the following output −
{ "_id" : ObjectId("5e47a8211627c0c63e7dba97"), "arrayOfObjectsId" : [ ObjectId("5e47a5e81627c0c63e7dba92"), ObjectId("5e47a5e51627c0c63e7dba91") ] }Following is the query to pull value from array of ObjectIDs −
> db.demo258.update( { }, { $pull: { arrayOfObjectsId: { $in: [ ObjectId("5e47a5e81627c0c63e7dba92") ] } } } );
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo258.find();
This will produce the following output −
{ "_id" : ObjectId("5e47a8211627c0c63e7dba97"), "arrayOfObjectsId" : [ ObjectId("5e47a5e51627c0c63e7dba91") ] }
Updated on: 31-Mar-2020
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