[Solved] Identify the error in this GraphQL type definition:type Book { title: String! pages: Int! author: String! published: Boolean summary:... }Which field declaration is invalid if summary can be null? | GraphQL

GraphQL - Schema Definition Language (SDL)

Identify the error in this GraphQL type definition:

type Book {
  title: String!
  pages: Int!
  author: String!
  published: Boolean
  summary: String!
}

Which field declaration is invalid if summary can be null?

Asummary: String!

Bpublished: Boolean

Cauthor: String!

Dpages: Int!

Step-by-Step Solution

Solution:

Step 1: Understand ! means non-null
Field summary is declared as String!, so it cannot be null.
Step 2: Check if summary can be null
The question states summary can be null, so this conflicts with the declaration.
Final Answer:
summary: String! -> Option A
Quick Check:
Non-null conflict = A [OK]

Quick Trick: Declare nullable fields without ! [OK]

Common Mistakes:

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