[Solved] Consider the following resolver chain:const resolvers = { Query: { post: () => ({ id: 10, title: 'GraphQL Rocks' }) }, Post: { summary: (parent) => parent.title.... | GraphQL

GraphQL - Resolvers

Consider the following resolver chain:

const resolvers = {
  Query: {
    post: () => ({ id: 10, title: 'GraphQL Rocks' })
  },
  Post: {
    summary: (parent) => parent.title.slice(0, 7)
  }
};

What is the output of the query?

{ post { summary } }

AError: slice is not a function

B{ "post": { "summary": "GraphQL" } }

C{ "post": { "summary": "GraphQL R" } }

D{ "post": { "summary": "GraphQL Rocks" } }

Step-by-Step Solution

Solution:

Step 1: Check the post resolver output
Returns { id: 10, title: 'GraphQL Rocks' }.
Step 2: Check the Post.summary resolver
It slices the title string from index 0 to 7, which is 'GraphQL'.
Final Answer:
{ "post": { "summary": "GraphQL" } } -> Option B
Quick Check:
String slice output = { "post": { "summary": "GraphQL" } } [OK]

Quick Trick: Use parent to access previous resolver's data [OK]

Common Mistakes:

Slicing incorrectly or off-by-one errors
Assuming slice returns full string
Confusing slice with substring

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More GraphQL Quizzes

Consider the following resolver chain:

Step 1: Check the post resolver output

Step 2: Check the Post.summary resolver

Final Answer:

Quick Check:

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