updateOne method in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to update one document in the collection.

MongoDB

db.collection.updateOne({ name: "John" }, { [1]: { age: 30 } })

Drag options to blanks, or click blank then click option'

A$unset

B$set

C$inc

D$push

Attempts:

3 left

💡 Hint

Common Mistakes

Using $push instead of $set will try to add to an array, not update a field.

Using $inc will increment a number, not set it to a specific value.

The $set operator updates the value of a field in the matched document.

2fill in blank

medium

Complete the code to update the first document where age is 25.

MongoDB

db.users.updateOne({ age: [1] }, { $set: { status: "active" } })

Drag options to blanks, or click blank then click option'

A"25"

Btrue

C25

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string "25" instead of number 25 causes no match.

Using true or null does not match the age field.

The query filter should match the number 25, not the string "25".

3fill in blank

hard

Fix the error in the updateOne call to increment the score by 5.

MongoDB

db.scores.updateOne({ player: "Alice" }, { [1]: { score: 5 } })

Drag options to blanks, or click blank then click option'

A$inc

B$set

C$push

D$mul

Attempts:

3 left

💡 Hint

Common Mistakes

Using $set replaces the score instead of incrementing it.

Using $push is for arrays, not numbers.

The $inc operator increments a numeric field by the given value.

4fill in blank

hard

Fill both blanks to update the city and add a new field country.

MongoDB

db.customers.updateOne({ name: "Bob" }, { [1]: { city: "Paris" }, [2]: { country: "France" } })

Drag options to blanks, or click blank then click option'

A$set

B$inc

C$unset

D$push

Attempts:

3 left

💡 Hint

Common Mistakes

Using $inc or $unset will not add or update string fields.

Using different operators for each field is incorrect here.

Use $set to update or add fields in the document.

5fill in blank

hard

Fill all three blanks to update the user's email, increment login count, and remove the temp field.

MongoDB

db.users.updateOne({ username: "jane" }, { [1]: { email: "[e-mail]" }, [2]: { logins: 1 }, [3]: { temp: "" } })

Drag options to blanks, or click blank then click option'

A$set

B$inc

C$unset

D$push

Attempts:

3 left

💡 Hint

Common Mistakes

Using $push instead of $inc for numbers.

Using $set to remove fields instead of $unset.

Not passing the field name as a string to $unset.

$set updates the email, $inc increments the login count, and $unset removes the temp field.