Scalar types (String, Int, Float, Boolean, ID) in GraphQL - Mini Project: Build & Apply

Building a GraphQL Schema with Scalar Types

📖 Scenario: You are creating a simple GraphQL API for a bookstore. The API needs to define a schema that includes different scalar types to represent book details.

🎯 Goal: Build a GraphQL schema that defines a Book type using scalar types: String, Int, Float, Boolean, and ID.

📋 What You'll Learn

Create a Book type with fields using the scalar types

Use ID for the book's unique identifier

Use String for the title and author

Use Int for the number of pages

Use Float for the price

Use Boolean for availability status

💡 Why This Matters

🌍 Real World

GraphQL schemas are used to define the structure of data in APIs, making it easier for clients to request exactly what they need.

💼 Career

Understanding scalar types in GraphQL is essential for backend developers building APIs and frontend developers querying data efficiently.

1

Define the Book type with ID and String fields

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

GraphQL

type Book {
  # Your code here
}

Need a hint?

Use ID! for unique identifiers and String! for text fields.

2

Add Int and Float fields to Book

Add two more fields to the Book type: pages of type Int! and price of type Float!.

GraphQL

type Book {
  id: ID!
  title: String!
  # Your code here
}

Need a hint?

Use Int! for whole numbers and Float! for decimal numbers.

3

Add Boolean field to Book

Add a available field of type Boolean! to the Book type to indicate if the book is in stock.

GraphQL

type Book {
  id: ID!
  title: String!
  pages: Int!
  price: Float!
  # Your code here
}

Need a hint?

Use Boolean! for true/false values.

4

Add author field with String type

Add an author field of type String! to the Book type to store the author's name.

GraphQL

type Book {
  id: ID!
  title: String!
  pages: Int!
  price: Float!
  available: Boolean!
  # Your code here
}

Need a hint?

Use String! for text fields like author names.