Object types in GraphQL - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a GraphQL object type named 'Book'.

GraphQL

type Book[1] {
  id: ID!
  title: String!
  author: String!
}

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

A<

B(

C[

D{

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses or square brackets instead of curly braces.

Forgetting to open the block with any symbol.

The GraphQL object type definition uses curly braces {} to enclose fields.

2fill in blank

medium

Complete the code to specify that the 'id' field is non-nullable.

GraphQL

type User {
  id: ID[1]
  name: String
}

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

A#

B?

C!

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using question mark or other symbols instead of exclamation mark.

Leaving out the non-nullable indicator.

The exclamation mark ! in GraphQL means the field cannot be null.

3fill in blank

hard

Fix the error in the object type definition by completing the code.

GraphQL

type Author {
  id: ID!
  name: String!
  books: [Book][1]
}

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

A!

B?

C*

D#

Attempts:

3 left

💡 Hint

Common Mistakes

Placing the exclamation mark inside the brackets instead of outside.

Using other symbols instead of exclamation mark.

The exclamation mark after the list type means the list itself cannot be null.

4fill in blank

hard

Fill both blanks to define a 'Query' type with a field 'book' that takes an 'id' argument of type 'ID!'.

GraphQL

type Query {
  book(id: [1]): Book[2]
}

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

AID!

BID

C!

D?

Attempts:

3 left

💡 Hint

Common Mistakes

Using nullable types for required arguments.

Omitting the exclamation mark for non-nullable return types.

The argument 'id' must be non-nullable ID!, and the return type 'Book' is non-nullable with !.

5fill in blank

hard

Fill all three blanks to define a 'Mutation' type with a 'createBook' field that takes 'title' and 'author' arguments as non-nullable strings and returns a non-nullable 'Book'.

GraphQL

type Mutation {
  createBook(title: [1], author: [2]): Book[3]
}

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

AString!

BString

C!

DID!

Attempts:

3 left

💡 Hint

Common Mistakes

Using nullable types for required arguments.

Forgetting the exclamation mark on the return type.

Both 'title' and 'author' arguments are non-nullable strings String!, and the return type 'Book' is non-nullable with !.