Embedded documents (nested objects) in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to insert a document with an embedded address object.

MongoDB

db.users.insertOne({ name: "Alice", address: [1] })

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

A"123 Main St, Springfield"

B["123 Main St", "Springfield"]

C{ street: "123 Main St", city: "Springfield" }

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using an array instead of an object for the embedded document.

Using a string instead of an object for the embedded document.

The embedded document must be an object with key-value pairs, not an array or string.

2fill in blank

medium

Complete the query to find users living in the city 'Springfield'.

MongoDB

db.users.find({ "address.[1]": "Springfield" })

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

Astreet

Bcity

Czip

Dstate

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong nested key like 'street' or 'zip'.

Not using quotes around the dot notation field.

To query a nested field, use dot notation with the key name. Here, 'city' is the nested key.

3fill in blank

hard

Fix the error in the update query to set the user's street to '456 Elm St'.

MongoDB

db.users.updateOne({ name: "Alice" }, { $set: { "address.[1]": "456 Elm St" } })

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

Astreet

Baddress

Czip

Dcity

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to update the whole address object instead of just the street.

Using the wrong nested key like 'city' or 'zip'.

The street field inside the embedded address document must be updated using 'address.street'.

4fill in blank

hard

Fill both blanks to create a document with a nested contact object containing email and phone.

MongoDB

db.contacts.insertOne({ name: "Bob", contact: { [1]: "[e-mail]", [2]: "123-456-7890" } })

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

Aemail

Bphone

Caddress

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using keys like 'address' or 'name' inside the contact object.

Mixing up the keys for email and phone.

The nested contact object should have keys 'email' and 'phone' with their respective values.

5fill in blank

hard

Fill all three blanks to query documents where the nested 'contact.email' ends with '@example.com'.

MongoDB

db.contacts.find({ "contact.[1]": { [2]: [3] } })

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

Aphone

B$regex

C"@example.com$"

Demail

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong nested key like 'phone'.

Using an incorrect operator instead of $regex.

Not using quotes around the regex pattern.

To filter by a pattern in a nested field, use dot notation for the field, the $regex operator, and the regex pattern string.