aws step functions dynamodb service integration & updating dynamic items

Question

I'm working on a step function state machine and can create lambdas in python and node to update an existing item in ddb.  However, I can't seem to find any examples with service integrations AND dynamic variables. The only ones I come across have static variable inserts/updates. In my case I am passing in data from an upstream lambda in python (which I am not so experienced with). Seems straightforward but I think my issue is json vs. dynamodb json. Thanks in advance.

Accepted Answer

If your issue is with DynamoDB JSON vs JSON, then I suggest that you use the abstract document clients. This allows you to use native JSON which is more easy to understand.
You can see Boto3 (Python) Examples [here](https://github.com/aws-samples/aws-dynamodb-examples/blob/master/DynamoDB-SDK-Examples/python/WorkingWithItems/updating_item.py) where it updates items using [Table Resource](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/dynamodb.html#table)

You also mention Node, which you can achieve the same with, examples [here](https://github.com/aws-samples/aws-dynamodb-examples/blob/master/DynamoDB-SDK-Examples/node.js/WorkingWithItems/update-item.js) and the documentation is here [NodeV2](https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/DocumentClient.html) , [NodeV3](https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/dynamodb-example-dynamodb-utilities.html).

Passing dynamic variables to Lambda come in the form of an event object. More info [here](https://docs.aws.amazon.com/lambda/latest/dg/lambda-services.html)

Hope that helps your issue.

aws step functions dynamodb service integration & updating dynamic items

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