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How do I remove a string from an array in a MongoDB document?
You can use $pull operator to remove a string from an array. Let us first create a collection with documents −
> db.removeAStringDemo.insertOne({"Score":[45,67,89,"John",98,99,67]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cda5224b50a6c6dd317adbd")
}Following is the query to display all documents from a collection with the help of find() method −
> db.removeAStringDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cda5224b50a6c6dd317adbd"),
"Score" : [
45,
67,
89,
"John",
98,
99,
67
]
}Following is the query to remove a string from an array in a MongoDB document. The string which is to be removed is “John” −
> db.removeAStringDemo.update( { _id :ObjectId("5cda5224b50a6c6dd317adbd") }, { $pull: { "Score":"John" }});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check the document once again −
> db.removeAStringDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cda5224b50a6c6dd317adbd"),
"Score" : [
45,
67,
89,
98,
99,
67
]
}
Updated on: 30-Jul-2019
301 Views
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