Insert with arrays in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to insert a document with an array field into the collection.

MongoDB

db.students.insertOne({ name: "Alice", grades: [1] })

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

A[85, 90, 78]

B{85, 90, 78}

C"85, 90, 78"

D(85, 90, 78)

Attempts:

3 left

💡 Hint

Common Mistakes

Using curly braces {} which define objects, not arrays.

Using parentheses () which are not valid for arrays.

Using a string instead of an array.

The grades field must be an array, so square brackets [] are used to define it.

2fill in blank

medium

Complete the code to insert multiple documents with arrays into the collection.

MongoDB

db.students.insertMany([ { name: "Bob", courses: [1] }, { name: "Carol", courses: ["Math", "Science"] } ])

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

A["History", "Art"]

B"History, Art"

C{"History", "Art"}

D("History", "Art")

Attempts:

3 left

💡 Hint

Common Mistakes

Using curly braces which define objects, not arrays.

Using parentheses which are invalid for arrays.

Using a string instead of an array.

The courses field must be an array, so square brackets [] are used to list the course names.

3fill in blank

hard

Fix the error in the code to correctly insert a document with an array field.

MongoDB

db.students.insertOne({ name: "Dave", hobbies: [1] })

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

A"reading, swimming, hiking"

B{reading, swimming, hiking}

C(reading, swimming, hiking)

D["reading", "swimming", "hiking"]

Attempts:

3 left

💡 Hint

Common Mistakes

Using a single string instead of an array.

Using curly braces which define objects.

Using parentheses which are invalid for arrays.

The hobbies field must be an array, so it needs square brackets with each hobby as a string.

4fill in blank

hard

Fill both blanks to insert a document with an array of objects representing books.

MongoDB

db.library.insertOne({ owner: "Eve", books: [ { title: [1], pages: [2] } ] })

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

A"The Hobbit"

B310

C"1984"

D250

Attempts:

3 left

💡 Hint

Common Mistakes

Putting numbers in quotes.

Not using quotes for strings.

Mixing up the order of title and pages.

The title must be a string with quotes, and pages is a number without quotes.

5fill in blank

hard

Fill all three blanks to insert multiple documents with arrays of tags.

MongoDB

db.posts.insertMany([ { title: [1], tags: [2] }, { title: [3], tags: ["mongodb", "database"] } ])

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

A"Introduction to MongoDB"

B["nosql", "database"]

C"Advanced Queries"

D["queries", "performance"]

Attempts:

3 left

💡 Hint

Common Mistakes

Using objects instead of arrays for tags.

Not quoting the titles.

Using parentheses instead of square brackets.

Titles are strings with quotes. Tags are arrays with square brackets and strings inside.