Create mutation pattern in GraphQL - Mini Project: Build & Apply

Create a GraphQL Mutation Pattern

📖 Scenario: You are building a simple GraphQL API for a bookstore. You want to allow users to add new books to the store's database.

🎯 Goal: Build a GraphQL mutation pattern that lets users add a new book with a title and author.

📋 What You'll Learn

Create a GraphQL type called Book with fields id, title, and author.

Create an input type called BookInput with fields title and author.

Create a mutation called addBook that takes a BookInput and returns a Book.

Use a simple in-memory list to store books with unique id values.

💡 Why This Matters

🌍 Real World

GraphQL mutations are used in real applications to change data, such as adding new records or updating existing ones.

💼 Career

Understanding how to create mutation patterns is essential for backend developers working with GraphQL APIs.

1

Define the Book type

Create a GraphQL type called Book with fields id of type ID!, title of type String!, and author of type String!.

GraphQL

# Define the Book type
# Your code here

Need a hint?

Use the type keyword to define a GraphQL object type with the specified fields.

2

Create the BookInput input type

Create a GraphQL input type called BookInput with fields title and author, both of type String!.

GraphQL

type Book {
  id: ID!
  title: String!
  author: String!
}

# Define the BookInput input type
# Your code here

Need a hint?

Use the input keyword to define an input type for mutations.

3

Define the addBook mutation

Create a mutation called addBook that takes one argument input of type BookInput! and returns a Book.

GraphQL

type Book {
  id: ID!
  title: String!
  author: String!
}

input BookInput {
  title: String!
  author: String!
}

# Define the Mutation type with addBook mutation
# Your code here

Need a hint?

Define a Mutation type with the addBook field that accepts BookInput! and returns Book.

4

Add a simple in-memory store and resolver pattern

Add a simple in-memory list called books to store book objects. Add a resolver function called addBook that takes input, assigns a unique id, adds the new book to books, and returns the new book.

GraphQL

type Book {
  id: ID!
  title: String!
  author: String!
}

input BookInput {
  title: String!
  author: String!
}

    type Mutation {
  addBook(input: BookInput!): Book
}

# Add an in-memory books list and addBook resolver function
# Your code here

Need a hint?

Use a JavaScript array to store books and a resolver function to add new books with unique IDs.