[Solved] An API Gateway integration request to DynamoDB fails with a validation error. The template is:{ "TableName": "Orders", "Key": { "OrderId": { "S": "$input.params('orderId')" } }, "DeleteKey":... | DynamoDB

DynamoDB - with Serverless

An API Gateway integration request to DynamoDB fails with a validation error. The template is:

{
  "TableName": "Orders",
  "Key": {
    "OrderId": { "S": "$input.params('orderId')" }
  },
  "DeleteKey": {
    "OrderId": { "S": "$input.params('orderId')" }
  }
}

What is the cause of the error?

AMissing "UpdateExpression" for delete operation

B'DeleteKey' is not a valid parameter for DynamoDB operations

CTableName is incorrect

DKey attribute type should be Number, not String

Step-by-Step Solution

Solution:

Step 1: Identify valid parameters for DynamoDB DeleteItem
DeleteItem requires TableName and Key; 'DeleteKey' is invalid.
Step 2: Confirm error cause
Using 'DeleteKey' causes validation failure because it is not recognized.
Final Answer:
'DeleteKey' is not a valid parameter for DynamoDB operations -> Option B
Quick Check:
DeleteItem uses 'Key', not 'DeleteKey' [OK]

Quick Trick: Use 'Key' for DeleteItem, never 'DeleteKey' [OK]

Common Mistakes:

MISTAKES

Using 'DeleteKey' instead of 'Key'
Expecting UpdateExpression for delete
Assuming attribute type mismatch

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More DynamoDB Quizzes

An API Gateway integration request to DynamoDB fails with a validation error. The template is:

Step 1: Identify valid parameters for DynamoDB DeleteItem

Step 2: Confirm error cause

Final Answer:

Quick Check:

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