[Solved] You have this schema:type Post { author: User } type User { posts: [Post] }Why does this query cause an error?{ post { author { posts } } } | GraphQL

GraphQL - Type Relationships

You have this schema:

type Post { author: User } type User { posts: [Post] }

Why does this query cause an error?

{ post { author { posts } } }

A<code>author</code> field is not defined

B<code>posts</code> field must be scalar

CMissing <code>id</code> field in <code>posts</code> selection

DQuery syntax is invalid

Step-by-Step Solution

Solution:

Step 1: Check the query selection set
The query requests posts but does not specify any fields inside the list.
Step 2: Understand GraphQL selection rules
GraphQL requires selecting fields inside objects or lists; empty selections cause errors.
Final Answer:
Missing id field in posts selection -> Option C
Quick Check:
Always select fields inside object lists [OK]

Quick Trick: Select fields inside lists, not just the list name [OK]

Common Mistakes:

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More GraphQL Quizzes

You have this schema: