If a GraphQL schema has type Book { title: String, author: Author } and the data is { title: "Dune", author: { name: "Frank" } }, what will the default resolver return for book.author.name?

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GraphQL - Resolvers

If a GraphQL schema has type Book { title: String, author: Author } and the data is { title: "Dune", author: { name: "Frank" } }, what will the default resolver return for book.author.name?

A"Frank"

B"Dune"

Cnull

DError: Cannot resolve nested field

Step-by-Step Solution

Solution:

Step 1: Follow default resolver for nested objects
The default resolver returns the nested object for author, then looks up name inside it.
Step 2: Check the nested data
The author object has name: "Frank", so the default resolver returns "Frank".
Final Answer:
"Frank" -> Option A
Quick Check:
Default resolver handles nested fields by chaining lookups [OK]

Quick Trick: Default resolvers chain lookups for nested fields automatically [OK]

Common Mistakes:

Assuming default resolver cannot handle nested objects
Returning wrong field value from parent object
Expecting errors for nested field resolution

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If a GraphQL schema has type Book { title: String, author: Author } and the data is { title: "Dune", author: { name: "Frank" } }, what will the default resolver return for book.author.name?

Step 1: Follow default resolver for nested objects

Step 2: Check the nested data

Final Answer:

Quick Check:

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