[Solved] Given this schema snippet:type Product { id: ID name: String category: Category } type Category { id: ID name: String }Which of the following query definitions will cause an error? | GraphQL

GraphQL - Type Relationships

Given this schema snippet:

type Product { id: ID name: String category: Category } type Category { id: ID name: String }

Which of the following query definitions will cause an error?

A{ product(id: "10") { name category { name } } }

B{ product(id: "10") { name } }

C{ product(id: "10") { name category { id } } }

D{ product(id: "10") { name category name } }

Step-by-Step Solution

Solution:

Step 1: Analyze the query fields
{ product(id: "10") { name category name } } tries to get 'category' as a scalar and also 'name' directly inside product.
Step 2: Understand GraphQL field types
'category' is an object type, so you must select subfields inside it, not alongside it.
Final Answer:
{ product(id: "10") { name category name } } -> Option D
Quick Check:
Object fields need subfields, can't mix with scalars = B [OK]

Quick Trick: Select subfields for object types, not scalar fields directly [OK]

Common Mistakes:

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