通过过滤对象数组来转换json并显示单个元素

Question

我正在尝试使用JOLT进行转换。

以下是我的意见，期望和规格。如何仅显示不带大括号的货币？

输入

{
  "txn": [
    {
      "direction": "BUY",
      "currency": "USD"
    },
    {
      "direction": "SELL",
      "currency": "EUR"
    }
  ]
}

规格

[
  {
    "operation": "shift",
    "spec": {
      "txn": {
        "*": {
          "direction": {
            "BUY": {
              "@2": "buyCurrency"
            }
          }
        }
      }
    }
  }
]

预期产量

{
  "buyCurrency" : "USD"
}

当前输出

{
  "buyCurrency" : {
    "direction" : "BUY",
    "currency" : "USD"
  }
}

Answer 1

尝试

[
  {
    "operation": "shift",
    "spec": {
      "txn": {
        "*": {
          "direction": {
            "BUY": {
              "@2": "."
            }
          }
        }
      }
    }
  },
  {
    "operation": "remove",
    "spec": {
      "direction": ""
    }
  },
  {
    "operation": "shift",
    "spec": {
      "currency": "currency"
    }
  }
]