You have a GraphQL interface Vehicle implemented by Car and Bike. How would you write a query to get the make for all vehicles, and additionally get numDoors only for cars using inline fragments?

hard📝 Application Q8 of 15

GraphQL - Queries

You have a GraphQL interface Vehicle implemented by Car and Bike. How would you write a query to get the make for all vehicles, and additionally get numDoors only for cars using inline fragments?

A{ vehicles { make ... on Vehicle { numDoors } } }

B{ vehicles { make ... Car { numDoors } } }

C{ vehicles { make ... on Car { numDoors } } }

D{ vehicles { make ... on Bike { numDoors } } }

Step-by-Step Solution

Solution:

Step 1: Query common fields outside fragments
'make' is common to all vehicles, so it goes directly inside 'vehicles'.
Step 2: Use inline fragment for Car-specific field
Use '... on Car { numDoors }' to get 'numDoors' only for cars.
Final Answer:
{ vehicles { make ... on Car { numDoors } } } -> Option C
Quick Check:
Inline fragment targets specific type fields [OK]

Quick Trick: Put common fields outside, type-specific inside inline fragments [OK]

Common Mistakes:

Omitting 'on' keyword
Using wrong type in inline fragment
Querying type-specific fields outside fragments

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You have a GraphQL interface Vehicle implemented by Car and Bike. How would you write a query to get the make for all vehicles, and additionally get numDoors only for cars using inline fragments?

Step 1: Query common fields outside fragments

Step 2: Use inline fragment for Car-specific field

Final Answer:

Quick Check:

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