[Solved] Identify the error in this resolver chain code snippet: const resolvers = { Query: { book: () => ({ id: 5, title: 'GraphQL Guide' }) }, Book: { author: (args) => { return { id: 2, name: 'John Doe' };... | GraphQL

GraphQL - Resolvers

Identify the error in this resolver chain code snippet:

const resolvers = {
  Query: {
    book: () => ({ id: 5, title: 'GraphQL Guide' })
  },
  Book: {
    author: (args) => {
      return { id: 2, name: 'John Doe' };
    }
  }
};

AThe author resolver is missing the parent argument

BThe book resolver should return a list, not an object

CThe author resolver should not return an object

DThe Query resolver should have three arguments

Step-by-Step Solution

Solution:

Step 1: Check author resolver signature
The author resolver should receive the parent object as the first argument to access book data.
Step 2: Identify missing parent argument
Here, author resolver only has args, so it cannot access parent data, breaking the resolver chain.
Final Answer:
The author resolver is missing the parent argument -> Option A
Quick Check:
Resolvers need parent as first argument [OK]

Quick Trick: Always include parent as first argument in chained resolvers [OK]

Common Mistakes:

Ignoring parent argument in nested resolvers
Thinking book resolver must return a list
Assuming author resolver cannot return objects

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More GraphQL Quizzes

Identify the error in this resolver chain code snippet:

Step 1: Check author resolver signature

Step 2: Identify missing parent argument

Final Answer:

Quick Check:

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