[Solved] This GraphQL schema snippet has an error for one-to-many relationship. What is wrong?type User { id: ID! name: String! posts: Post } type Post { id: ID! content: String! userId: ID! } | GraphQL

GraphQL - Type Relationships

This GraphQL schema snippet has an error for one-to-many relationship. What is wrong?

type User { id: ID! name: String! posts: Post } type Post { id: ID! content: String! userId: ID! }

AThe posts field should be a list type [Post!]! instead of Post.

BThe userId field should be removed from Post.

CThe name field in User should be optional.

DThe id fields should be of type String, not ID.

Step-by-Step Solution

Solution:

Step 1: Check the posts field type for one-to-many
One user can have many posts, so posts must be a list, not a single Post.
Step 2: Verify other fields
userId in Post is correct to link back; name optionality and id type are unrelated.
Final Answer:
posts field must be a list [Post!]! -> Option A
Quick Check:
One-to-many needs list type for many children [OK]

Quick Trick: Use brackets [] for multiple related items in schema [OK]

Common Mistakes:

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This GraphQL schema snippet has an error for one-to-many relationship. What is wrong?