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Opposite of $addToSet to '$removeFromSet' in MongoDB?
To get the opposite of $addToSet to '$removeFromSet', use the $pull operator.
Let us create a collection with a document. The query to create a collection with a document is as follows −
> db.oppositeAddToSetDemo.insertOne({"StudentName":"John","StudentHobby":["Cricket","Cooking","Drawing"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8eddcc2f684a30fbdfd588")
}
> db.oppositeAddToSetDemo.insertOne({"StudentName":"Carol","StudentHobby":["Cricket","Dance","Hiking"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8eddfd2f684a30fbdfd589")
}
> db.oppositeAddToSetDemo.insertOne({"StudentName":"David","StudentHobby":["Learning","Photography"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8ede272f684a30fbdfd58a")
}Display all documents from a collection with the help of find() method. The query is as follows −
> db.oppositeAddToSetDemo.find().pretty();
The following is the output −
{
"_id" : ObjectId("5c8eddcc2f684a30fbdfd588"),
"StudentName" : "John",
"StudentHobby" : [
"Cricket",
"Cooking",
"Drawing"
]
}
{
"_id" : ObjectId("5c8eddfd2f684a30fbdfd589"),
"StudentName" : "Carol",
"StudentHobby" : [
"Cricket",
"Dance",
"Hiking"
]
}
{
"_id" : ObjectId("5c8ede272f684a30fbdfd58a"),
"StudentName" : "David",
"StudentHobby" : [
"Learning",
"Photography"
]
}Here is the query for opposite of $addToSet to '$removeFromSet' using $pull operator −
> db.oppositeAddToSetDemo.update(
... {"StudentName": "John"},
... {$pull: { "StudentHobby": "Cooking"}});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check the documents from the collection using find(). The query is as follows:
> db.oppositeAddToSetDemo.find().pretty();
The following is the output −
{
"_id" : ObjectId("5c8eddcc2f684a30fbdfd588"),
"StudentName" : "John",
"StudentHobby" : [
"Cricket",
"Drawing"
]
}
{
"_id" : ObjectId("5c8eddfd2f684a30fbdfd589"),
"StudentName" : "Carol",
"StudentHobby" : [
"Cricket",
"Dance",
"Hiking"
]
}
{
"_id" : ObjectId("5c8ede272f684a30fbdfd58a"),
"StudentName" : "David",
"StudentHobby" : [
"Learning",
"Photography"
]
}
Updated on: 30-Jul-2019
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