From the course: MongoDB Java Developer Associate Cert Prep

Unlock this course with a free trial

Join today to access over 25,500 courses taught by industry experts.

Finding documents by using comparison operators

Finding documents by using comparison operators

From the course: MongoDB Java Developer Associate Cert Prep

Start my 1-month free trial Buy for my team

Finding documents by using comparison operators

“

- Welcome. In this video you'll learn how to update and return the same document in MongoDB. We'll cover how and when to use the findAndModify() method. We'll also explain how findAndModify() is different from the updateOne() method. findAndModify() is used to return the document that has just been updated. For example, imagine we're creating an app that tracks the number of users who download a podcast. One way to update and return the number of downloads is to use the updateOne() and findOne() methods. First, we would use updateOne() to increment the downloads field. Then we would use findOne() to return the document by using the _id. The problem with this approach is that it makes two round trips to the server where findAndModify() is only one. Additionally, if we make our update via updateOne(), another user could modify the document before our findOne() and we'll get a different version of the document. To…

Contents