[Solved] Given the resolver chain below, what will be the final output of the query?const resolvers = { Query: { user: () => ({ id: 1, name: 'Anna' }) }, User: { greeting: (parent) => `Hello, ${parent.name}!... | GraphQL

GraphQL - Resolvers

Given the resolver chain below, what will be the final output of the query?

const resolvers = {
  Query: {
    user: () => ({ id: 1, name: 'Anna' })
  },
  User: {
    greeting: (parent) => `Hello, ${parent.name}!`
  }
};

Query:

{ user { greeting } }

A{ "user": { "greeting": "Hello, Anna!" } }

B{ "user": { "greeting": "Hello, undefined!" } }

C{ "user": { "greeting": "Hello, !" } }

DError: Cannot read property 'name' of undefined

Step-by-Step Solution

Solution:

Step 1: Understand the Query resolver
The Query resolver returns an object with id and name: { id: 1, name: 'Anna' }.
Step 2: Understand the User.greeting resolver
The greeting resolver receives the parent object and returns 'Hello, ' plus parent.name plus '!'.
Final Answer:
{ "user": { "greeting": "Hello, Anna!" } } -> Option A
Quick Check:
Resolver chain output = { "user": { "greeting": "Hello, Anna!" } } [OK]

Quick Trick: Parent object passes data to nested resolver [OK]

Common Mistakes:

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