GraphQL - Basics and Philosophy
You want to add a new field 'age' to User type that is optional but must be an integer if present. How do you define it in SDL?
You want to add a new field 'age' to User type that is optional but must be an integer if present. How do you define it in SDL?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand optional field syntax
In SDL, absence of ! means the field is optional (nullable).Step 2: Choose correct syntax for optional integer
'age: Int' means age can be null or an integer, matching requirement.Final Answer:
age: Int -> Option DQuick Check:
Optional field = type without ! [OK]
Quick Trick: No ! means field is optional (nullable) [OK]
Common Mistakes:
- Using Int! makes field required
- Using ? or ?: which are invalid in SDL
- Confusing optional with non-null
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