You wrote a GraphQL schema with type Query { user: User } but your query returns null for user. What is a likely cause related to default resolvers?

medium📝 Debug Q14 of 15

GraphQL - Resolvers

You wrote a GraphQL schema with type Query { user: User } but your query returns null for user. What is a likely cause related to default resolvers?

AThe data source does not have a matching key named 'user'

BYou forgot to write a custom resolver for 'user'

CThe schema syntax is invalid

DGraphQL does not support default resolvers

Step-by-Step Solution

Solution:

Step 1: Recall default resolver behavior
Default resolvers return data matching the field name from the data source.
Step 2: Identify cause of null result
If the data source lacks a key named 'user', the default resolver returns null.
Final Answer:
The data source does not have a matching key named 'user' -> Option A
Quick Check:
Missing data key causes null from default resolver [OK]

Quick Trick: Check data keys match schema fields for default resolver to work [OK]

Common Mistakes:

Assuming custom resolver is always required
Blaming schema syntax without checking data
Thinking default resolvers are unsupported

Master "Resolvers" in GraphQL

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

More GraphQL Quizzes

You wrote a GraphQL schema with type Query { user: User } but your query returns null for user. What is a likely cause related to default resolvers?

Step 1: Recall default resolver behavior

Step 2: Identify cause of null result

Final Answer:

Quick Check:

Want More Practice?