mongodbHow to use MongoDB pull?
MongoDB's $pull
operator is used to remove an item from an array. It takes two arguments: the first is the name of the field containing the array, and the second is the value to be removed.
Example
db.collection.update(
{ _id: 1 },
{ $pull: { arrayField: "valueToRemove" } }
)
Output example
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
Code explanation
db.collection.update
: This is the MongoDB command used to update a document in a collection.{ _id: 1 }
: This is the query used to select the document to update.{ $pull: { arrayField: "valueToRemove" } }
: This is the update operator used to remove an item from an array. The first argument is the name of the field containing the array, and the second is the value to be removed.
Helpful links
More of Mongodb
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- Example of a MongoDB connection string
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- How to query with "not equal" condition in MongoDB?
- How to empty an array in MongoDB?
- How to update many documents in MongoDB?
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