Code generation from schema in GraphQL - Mini Project: Build & Apply

GraphQL Code Generation from Schema

📖 Scenario: You are building a simple GraphQL API for a bookstore. You want to generate the code for the schema that defines the data types and queries.

🎯 Goal: Create a GraphQL schema that defines a Book type and a query to get all books.

📋 What You'll Learn

Create a Book type with fields id (ID!), title (String!), and author (String!)

Create a Query type with a field books that returns a list of Book

Use proper GraphQL syntax for types and queries

💡 Why This Matters

🌍 Real World

GraphQL schemas define the structure of data clients can query in modern APIs, used in web and mobile apps.

💼 Career

Understanding schema design is essential for backend developers and API engineers working with GraphQL.

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 type Book { ... } syntax and specify each field with its type and exclamation mark for required fields.

2

Define the Query type

Add a GraphQL Query type with a field called books that returns a list of Book objects (use square brackets).

GraphQL

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

# Define the Query type
# Your code here

Need a hint?

Use type Query { books: [Book] } to define the query returning a list of books.

3

Add non-nullable list to books field

Modify the books field in the Query type to return a non-nullable list of non-nullable Book objects. Use [Book!]! syntax.

GraphQL

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

type Query {
  # Update books field type
  books: [Book]
  # Your code here
}

Need a hint?

Use [Book!]! to indicate the list and its items cannot be null.

4

Complete the schema with a comment

Add a comment at the top of the schema that says # Bookstore GraphQL Schema.

GraphQL

# Your comment here

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

type Query {
  books: [Book!]!
}

Need a hint?

Use # to add a comment line at the top.