'How to specify multiple result path values in AWS Step Functions

I have a AWS Step Function State formatted as follows:

"MyState": {
  "Type": "Task",
  "Resource": "<MyLambdaARN>",
  "ResultPath": "$.value1"
  "Next": "NextState"
}

I want to add a second value but can't find out how anywhere. None of the AWS examples display multiple ResultPath values being added to the output.

Would I just add a comma between them?

"MyState": {
  "Type": "Task",
  "Resource": "<MyLambdaARN>",
  "ResultPath": "$.value1, $.value2"
  "Next": "NextState"
}

Or is there a better way to format these?

aws-lambda aws-step-functions

Solution 1:^[1]

You cannot specify several values in ResultPath, because ResultPath defines the path of your result value in the json. The close analogy for ResultPath is a return value of a function, as your step can return only 1 value it should be put into 1 node in the resulting json.

If you have an input json

{
  "myValue": "value1",
  "myArray": [1,2,3]
}

And define your ResultPath as $.myResult the overall resulting json will be

{
  "myValue": "value1",
  "myArray": [1,2,3],
  "myResult": "result"
}

Now you can truncate this json to pass only part of it to the next step in your function using OutputPath (e.g. OutputPath: "$.myResult")

InputPath and OutputPath can have several nodes in their definition, but ResultPath should always have only 1 node.

Solution 2:^[2]

Seems like today it can be done by using ResultsSelector.

Solution 3:^[3]

I think it would be like the following, but I haven't actually done this so I can't say for sure.

"ResultPath": {

                 "var1" : "$.value1",
                 "var2" : "$.value2"
 },

=====

After looking further into this, I am convinced that there is no direct way to do what you want to do. Here is a way that could give you the results that you want.

1) You would omit the InputPath, OutputPath, and ResultPath from your step. This would mean that all of $. would be passed in as an input to your step function and that all of the output from the lambda function would be stored as $. In the lambda function you could set the results fields to be whatever you want them to be. The lambda function must return the modified input as it output.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1
Solution 2	Roman Kovtuh
Solution 3

'How to specify multiple result path values in AWS Step Functions

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Sources

Related Questions

Solution 1:^[1]

Solution 2:^[2]

Solution 3:^[3]