Updating Documents

This video tutorial explores updating documents in MongoDB using promises instead of callbacks. It covers the use of updateOne and updateMany methods, focusing on targeting documents by ID and applying updates with operators like $set and $inc. The tutorial includes a practical challenge to update multiple documents using updateMany, emphasizing the importance of promises in handling asynchronous operations.

What is the primary focus of the initial section on MongoDB updates?

• Setting up MongoDB with Node.js

• Updating documents using promises

• Using callbacks for document updates

• Deleting documents in MongoDB

Which method is used to update a single document in MongoDB?

• updateMany

• updateOne

• findOne

• insertOne

What is the purpose of the $set operator in MongoDB updates?

• To delete a document

• To rename a field

• To set new values for fields

• To increment a field value

How do promises improve handling of MongoDB updates?

• They allow for synchronous execution

• They automatically retry failed updates

• They eliminate the need for error handling

• They provide a cleaner way to handle success and error cases

What is the purpose of the .catch method in promise handling?

• To handle errors when the promise is rejected

• To chain multiple promises together

• To execute code when the promise is fulfilled

• To log the result of the promise

Which operator would you use to increase a numeric field in a MongoDB document?

• $set

• $unset

• $rename

• $inc

What is the main advantage of using the $inc operator?

• It deletes fields

• It can rename fields

• It simplifies incrementing numeric fields

• It allows for batch updates

What is the key difference between updateOne and updateMany?

• updateOne requires a callback, updateMany does not

• updateOne is deprecated, updateMany is not

• updateOne updates all documents, updateMany updates one

• updateOne updates a single document, updateMany updates multiple

In the challenge, what was the goal of using updateMany?

• To delete all documents

• To update all tasks to be marked as complete

• To find a specific document

• To insert multiple documents

What should you do if your tasks are already marked as complete before running the updateMany challenge?

• Edit tasks to set completed to false

• Run the script without changes

• Create new tasks

• Delete all tasks