amazon-web-services - 如何在AWS Step Functions中使用数组内部的jsonPath

Question

我正在编写一个AWS步骤函数，对于其中一个步骤，我希望调用一个接受数组作为输入之一的lambda。但是，如果我尝试将JsonPath传递到数组中，则会得到

The value for the field 'arrayField.$' must be a STRING that contains a JSONPath but was an ARRAY

我的步进函数定义:

{
  "StartAt": "First",
  "States": {
  "First": {
    "Type": "Pass",
    "Parameters": {
      "type": "person"
    },
    "ResultPath": "$.output",
    "Next": "Second"
  },
    "Second": {
      "Type": "Task",
      "Resource": "arn:aws:lambda:us-east-1:<aws_id>:function:MyFunction",
      "Parameters": {
        "regularParameter": "some string",
        "arrayParameter.$": ["$.output.type"]
      },
      "Next": "Succeed"
    },
    "Succeed": {
      "Type": "Succeed"
    }
  }
}

如何在数组内使用jsonPath？

Answer 1

从新发行版开始，您可以使用内部函数States.Array:

  "arrayParameter.$": "States.Array($.output.type)"

https://docs.aws.amazon.com/step-functions/latest/dg/amazon-states-language-intrinsic-functions.html