MongoDB Delte Documents Tutorial
The MongoDB deleteOne() and deleteMany()methods are used to remove documents from a collection.
Delete a Single Document
We use deleteOne() to remove a single document that matches a specific filter.
db.myCollection.deleteMany({ age: { $lt: 25 } });
Delete Multiple Documents
The deleteMany() is to remove multiple documents that match a specific filter.
db.myCollection.deleteMany({ age: { $lt: 25 } }); Delete All Documents
To delete all documents in a collection, you can use an empty filter with deleteMany().
db.myCollection.deleteMany({});
Result of Delete Operations
Both deleteOne() and deleteMany() return a result object with information about the operation
const result = db.myCollection.deleteOne({ name: "John" });
printjson(result);
Delete with Collation
You can specify collation to perform case-insensitive deletions.
db.myCollection.deleteOne({ name: "jane" }, { collation: { locale: "en", strength: 2 } });
Delete with Write Concern
Specify write concern options for safe deletes, such as { w: "majority" }.
Deleting Documents by _id
You can delete documents based on their unique _id value.
db.myCollection.deleteOne({ _id: ObjectId("document_id_here") });
Conditional Deletes
You can perform conditional deletes with operators like $eq, $gt, and $lt.
db.myCollection.deleteMany({ age: { $lt: 25 } });
Deleting Nested Documents
To delete specific elements within nested arrays, use the $pull operator with an update operation.