[Solved] Given this GraphQL query in AppSync linked to DynamoDB:query GetBook { getBook(id: "123") { id title author } }And the DynamoDB table has an item:{"id": "123", "title": "Learn DynamoDB", "author":... | DynamoDB

DynamoDB - with Serverless

Given this GraphQL query in AppSync linked to DynamoDB:

query GetBook { getBook(id: "123") { id title author } }

And the DynamoDB table has an item:

{"id": "123", "title": "Learn DynamoDB", "author": "Jane"}

What will be the output of this query?

A{"data": {"getBook": {"id": "123", "title": "Learn DynamoDB", "author": "Jane"}}}

B{"data": {"getBook": null}}

C{"errors": [{"message": "Item not found"}]}

D{"data": {"getBook": {"id": "123", "title": null, "author": null}}}

Step-by-Step Solution

Solution:

Step 1: Understand the query and data
The query requests the item with id "123" and fields id, title, author. The table has this exact item.
Step 2: Predict the query result
Since the item exists, the query returns all requested fields with their values.
Final Answer:
{"data": {"getBook": {"id": "123", "title": "Learn DynamoDB", "author": "Jane"}}} -> Option A
Quick Check:
Existing item returns full data [OK]

Quick Trick: If item exists, query returns requested fields with values [OK]

Common Mistakes:

MISTAKES

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