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MongoDB query to remove array elements from a document?
Use the $pull to remove array elements from a MongoDB document as shown in the following syntax −
db.yourCollectionName.update( { },{ $pull: { yourFieldName: yourValue }},{multi:true });
Let us first create a collection with documents −
>db.removeArrayElementsDemo.insertOne({"AllPlayerName":["John","Sam","Carol","David"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd90d011a844af18acdffc1") } >db.removeArrayElementsDemo.insertOne({"AllPlayerName":["Chris","Robert","John","Mike"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd90d2e1a844af18acdffc2") }
Following is the query to display all documents from a collection with the help of find() method −
> db.removeArrayElementsDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd90d011a844af18acdffc1"), "AllPlayerName" : [ "John", "Sam", "Carol", "David" ] } { "_id" : ObjectId("5cd90d2e1a844af18acdffc2"), "AllPlayerName" : [ "Chris", "Robert", "John", "Mike" ] }
Here is the query to remove array elements from a document −
> db.removeArrayElementsDemo.update( { },{ $pull: { AllPlayerName: "John" }},{multi:true }); WriteResult({ "nMatched" : 2, "nUpserted" : 0, "nModified" : 2 })
Let us check all the documents once again −
> db.removeArrayElementsDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd90d011a844af18acdffc1"), "AllPlayerName" : [ "Sam", "Carol", "David" ] } { "_id" : ObjectId("5cd90d2e1a844af18acdffc2"), "AllPlayerName" : [ "Chris", "Robert", "Mike" ] }
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