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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") ] }
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