[Solved] An API Gateway integration request to DynamoDB uses this template:{ "TableName": "Users", "Key": { "UserId": { "S": "$input.params('userId')" } }, "UpdateExpression":... | DynamoDB

DynamoDB - with Serverless

An API Gateway integration request to DynamoDB uses this template:

{
  "TableName": "Users",
  "Key": {
    "UserId": { "S": "$input.params('userId')" }
  },
  "UpdateExpression": "set Age = :age",
  "ExpressionAttributeValues": {
    ":age": { "N": "$input.params('age')" }
  }
}

What is the error in this template?

AMissing 'UpdateItem' as the operation type

BThe template is missing 'ReturnValues' parameter

CNo error; this is a valid UpdateItem request

DUsing 'Key' and 'UpdateExpression' together is invalid

Step-by-Step Solution

Solution:

Step 1: Review UpdateItem request requirements
UpdateItem requires TableName, Key, UpdateExpression, and ExpressionAttributeValues.
Step 2: Check the template fields
All required fields are present; 'ReturnValues' is optional.
Final Answer:
No error; this is a valid UpdateItem request -> Option C
Quick Check:
UpdateItem needs Key + UpdateExpression [OK]

Quick Trick: UpdateItem needs Key and UpdateExpression together [OK]

Common Mistakes:

MISTAKES

Thinking 'ReturnValues' is mandatory
Believing Key and UpdateExpression cannot coexist
Expecting operation type in template

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An API Gateway integration request to DynamoDB uses this template:

Step 1: Review UpdateItem request requirements

Step 2: Check the template fields

Final Answer:

Quick Check:

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