One-to-many relationships in GraphQL - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a GraphQL type for a single Author.

GraphQL

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

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

Abooks

Bbook

Cauthor

Dtitle

Attempts:

3 left

💡 Hint

Common Mistakes

Using singular form like 'book' which implies only one book.

Using unrelated field names like 'author' or 'title' here.

The field books represents the list of books an author has written, showing the one-to-many relationship.

2fill in blank

medium

Complete the code to define a GraphQL type for a Book with a reference to its Author.

GraphQL

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

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

Abooks

Bauthor

Cwriters

Dpublisher

Attempts:

3 left

💡 Hint

Common Mistakes

Using plural forms like 'books' or 'writers' which don't fit here.

Using unrelated fields like 'publisher' which is not part of this relationship.

The field author links each book to its single author, showing the many-to-one side of the relationship.

3fill in blank

hard

Fix the error in the Book type where the author field is incorrectly typed as a list.

GraphQL

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

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A[Author!]

BString!

CAuthor!

DID!

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list type which implies multiple authors per book.

Using scalar types like String or ID instead of the Author type.

The author field should be a single Author! type, not a list, because each book has exactly one author.

4fill in blank

hard

Fill both blanks to define a query that fetches all authors and their books.

GraphQL

type Query {
  [1]: [Author!]!
  [2]: [Book!]!
}

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Aauthors

Bauthor

Cbooks

Dbook

Attempts:

3 left

💡 Hint

Common Mistakes

Using singular names which imply single items instead of lists.

Mixing up authors and books field names.

The query fields authors and books return lists of authors and books respectively.

5fill in blank

hard

Fill all three blanks to define a mutation that adds a new book with an author ID.

GraphQL

type Mutation {
  addBook(title: String!, authorId: ID!): [1]!
}

type Book {
  id: ID!
  title: String!
  author: [2]!
}

input [3]Input {
  title: String!
  authorId: ID!
}

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

ABook

BAuthor

CAddBook

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong return types for mutation.

Confusing author type with book type.

Naming input type incorrectly.

The mutation returns a Book type. The book's author field is of type Author. The input type for adding a book is named AddBookInput.