[Solved] You have this GraphQL schema:type Category { products: [Product] } type Product { category:... | GraphQL

GraphQL - Type Relationships

You have this GraphQL schema:

type Category { products: [Product] } type Product { category: Category }

But your query for category { products { category { id } }} returns null for category inside products. What is the likely cause?

AThe <code>products</code> field should not be a list

BGraphQL does not support nested bidirectional queries

CThe <code>category</code> field in <code>Product</code> is not properly resolved or linked

DThe query syntax is invalid

Step-by-Step Solution

Solution:

Step 1: Analyze the schema and query
Schema defines bidirectional links. Query asks for category's products and each product's category id.
Step 2: Identify why nested category is null
If nested category is null, likely the resolver for category in Product is missing or incorrect.
Final Answer:
The category field in Product is not properly resolved or linked -> Option C
Quick Check:
Missing resolver causes null nested fields [OK]

Quick Trick: Null nested fields often mean missing resolver functions [OK]

Common Mistakes:

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