How should you define a GraphQL object type Group that contains a field participants which is a list of User objects?

hard📝 Application Q9 of 15

GraphQL - Schema Definition Language (SDL)

How should you define a GraphQL object type Group that contains a field participants which is a list of User objects?

Atype Group { participants: List<User> }

Btype Group { participants: User }

Ctype Group { participants: User[] }

Dtype Group { participants: [User] }

Step-by-Step Solution

Solution:

Step 1: Recall list syntax in GraphQL
Lists are denoted by square brackets around the type, e.g., [User].
Step 2: Analyze options
type Group { participants: [User] } correctly uses [User]. Options C and D use invalid syntax. type Group { participants: User } defines a single User, not a list.
Final Answer:
A -> Option D
Quick Check:
Lists use square brackets in GraphQL [OK]

Quick Trick: Use [Type] for lists in GraphQL [OK]

Common Mistakes:

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