json - AWS Step Function 返回条件路径引用错误

Question

我在 AWS Step Functions 中运行具有两个选项的 Step Functions。

...
"ChoiceState": {
  "Type" : "Choice",
  "Choices": [
    {
      "Variable": "$[0].input",
      "NumericEquals":1,
      "Next": "FirstMatchState"
    },
    {
      "Variable": "$[0].input",
      "NumericEquals":2,
      "Next": "SecondMatchState"
    }
  ],
  "Default": "DefaultState"
},
...

使用此输入输入的选择状态

//ChoiceStateEntered

{
"name": "ChoiceState",
"input": 1
}

抛出错误

{
 "error": "States.Runtime",
 "cause": "An error occurred while executing the state 'ChoiceState'      (entered at the event id #7). Invalid path '$[0].input': The choice state's condition path references an invalid value."
}

Answer 1

简单地说，您不需要 $[0] 而是需要 $。根据您的输入，您应该使用 $.input 而不是 $[0].input