updateOne method in MongoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the updateOne method do in MongoDB?

It updates a single document in a collection that matches the given filter criteria. If multiple documents match, only the first one is updated.

beginner

What are the two main arguments passed to updateOne?

The first argument is the filter to find the document to update. The second argument specifies the update operations to apply to the matched document.

beginner

How do you use $set with updateOne?

You use $set inside the update argument to change specific fields without replacing the whole document. For example: { $set: { field: value } }.

beginner

What happens if no documents match the filter in updateOne?

No documents are updated. The method returns a result indicating zero documents matched and zero modified.

intermediate

Can updateOne create a new document if none matches the filter?

Yes, if you set the option upsert: true, updateOne will insert a new document when no match is found.

What does updateOne update in MongoDB?

A Only the first document matching the filter

B All documents matching the filter

C Only documents with a specific _id

D All documents in the collection

updateOne updates only the first document that matches the filter criteria.

Which operator is commonly used with updateOne to change specific fields?

A $push

B $set

C $match

D $group

$set updates specific fields without replacing the whole document.

What option allows updateOne to insert a new document if none matches the filter?

A insertIfNone: true

B createNew: true

C upsert: true

D insertOnFail: true

The upsert: true option inserts a new document if no match is found.

If no document matches the filter, what does updateOne do by default?

A Updates the first document anyway

B Inserts a new document

C Deletes a document

D Does nothing

By default, updateOne does nothing if no document matches the filter.

What is the first argument to updateOne?

A The filter to find the document

B The collection name

C The update operations

D The options object

The first argument is the filter used to find the document to update.

Explain how the updateOne method works in MongoDB and what arguments it takes.

Think about how you find the document and what changes you want to make.

Describe what happens when you use updateOne with the upsert option set to true.

Upsert means update or insert.