Difference between the UpdateOne() and findOneAndUpdate Methods in Mongo DB

Question

What is the difference between the UpdateOne() and the findOneAndUpdate() methods in Mongo DB? I can't seem o understand their differences. Would appreciate it if a demonstrative example using UpdateOne() and findOneAndUpdate could be used.

Answer 1

Insert a document in an otherwise empty collection using the mongo-shell to start:

db.users.insertOne({name: "Jack", age: 11})

UpdateOne

db.users.updateOne({name: "Jack"}, {$set: {name: "Joe"}})

This operation returns an UpdateResult.

{ acknowledged: true,
  insertedId: null,
  matchedCount: 1,
  modifiedCount: 1,
  upsertedCount: 0 }

FindOneAndUpdate

db.users.findOneAndUpdate({name: "Joe"}, {$set: {name: "Jill"}})

This operation returns the document that was updated.

{ _id: ObjectId("62ecf94510fc668e92f3cecf"),
  name: 'Joe',
  age: 11 }

FindOneAndUpdate is preferred when you have to update a document and fetch it at the same time.