[Solved] Examine this GraphQL schema snippet for a one-to-many relationship: type Customer { id: ID! orders: Order! } type Order { id: ID! customer: Customer! } What is the issue here? | GraphQL

GraphQL - Type Relationships

Examine this GraphQL schema snippet for a one-to-many relationship:

type Customer { id: ID! orders: Order! } type Order { id: ID! customer: Customer! }

What is the issue here?

AThe 'orders' field should be a list type to represent multiple orders.

BThe 'customer' field in Order should be a list type.

CThe 'id' fields should not be non-nullable.

DThe schema is correct as is.

Step-by-Step Solution

Solution:

Step 1: Understand the relationship
A Customer can have many Orders, so orders field must be a list.
Step 2: Check schema types
orders: Order! means a single Order, not multiple.
Step 3: Correct representation
It should be orders: [Order!]! to represent many orders properly.
Final Answer:
Option A -> Option A
Quick Check:
List type needed on 'many' side [OK]

Quick Trick: Use list type for 'many' side fields [OK]

Common Mistakes:

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