[Solved] Consider this resolver snippet:const resolvers = { User: { posts: (parent) => { if (!parent.id) return []; return [{ id: 1, title:... } } };What will posts resolver return if parent is {}? | GraphQL

GraphQL - Type Relationships

Consider this resolver snippet:

const resolvers = {
  User: {
    posts: (parent) => {
      if (!parent.id) return [];
      return [{ id: 1, title: 'Hello', userId: parent.id }];
    }
  }
};

What will posts resolver return if parent is {}?

A[] (empty array)

BArray with one post object

Cnull

DThrows runtime error

Step-by-Step Solution

Solution:

Step 1: Check condition on parent.id
Since parent is empty object, parent.id is undefined (falsy).
Step 2: Return empty array if no parent.id
Function returns [] when parent.id is falsy.
Final Answer:
[] (empty array) -> Option A
Quick Check:
Falsy parent.id returns empty array [OK]

Quick Trick: Falsy parent.id returns empty array in posts resolver [OK]

Common Mistakes:

Expecting a post object despite missing id
Assuming null return
Thinking it throws error

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Consider this resolver snippet:

Step 1: Check condition on parent.id

Step 2: Return empty array if no parent.id

Final Answer:

Quick Check:

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