Why updating documents matters in MongoDB - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to update the age of a user to 30.

MongoDB

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

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

A25

Bage

C"30"

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around 30 makes it a string, not a number.

Using the field name instead of the value.

The $set operator updates the field to the given value. Here, age is set to 30 as a number.

2fill in blank

medium

Complete the code to update all documents where status is 'pending' to have status 'complete'.

MongoDB

db.orders.updateMany({status: "pending"}, {$set: {status: [1])

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

A"complete"

B"pending"

Ccomplete

Dstatus

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the string value.

Using the old status value instead of the new one.

The $set operator changes the status field to the string "complete" for all matching documents.

3fill in blank

hard

Fix the error in the update code to increment the score by 5.

MongoDB

db.players.updateOne({name: "Bob"}, {$inc: {score: [1])

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

A5

Bscore

C-5

D"5"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string "5" instead of number 5.

Using a negative number which decreases the score.

The $inc operator increments the score by the number 5. It must be a number, not a string.

4fill in blank

hard

Fill both blanks to update the user's city to 'Seattle' and add a new field 'verified' set to true.

MongoDB

db.users.updateOne({name: "Carol"}, {$set: {city: [1], verified: [2])

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

A"Seattle"

Btrue

Cfalse

D"Portland"

Attempts:

3 left

💡 Hint

Common Mistakes

Using false instead of true for verified.

Forgetting quotes around city name.

The city field is updated to the string "Seattle" and the verified field is added with the boolean value true.

5fill in blank

hard

Fill all three blanks to update the product price to 19.99, increase stock by 10, and set available to true.

MongoDB

db.products.updateOne({productId: 123}, {$set: {price: [1], available: [2], $inc: {stock: [3])

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

A19.99

Btrue

C10

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using false instead of true for available.

Using a string instead of number for price or stock.

The price is set to 19.99, available is set to true, and stock is incremented by 10.