json - 尼菲震动 : flat JSON object to a list of JSON object

Question

我正在尝试使用 Nifi JOLT 处理器将平面 JSON 对象转换为 JSON 对象列表，如下面的输出所示。参数 "p_7_1_0"、"px_2_7_1_0"、"pv_7_1_1" 的名称或编号可能不同(例如，我可以有 { “时间戳”:1559347670，“pw_2_1_0”:1，“p_2_2_1_0”:1 })

有人可以帮我了解震动规范吗？

输入Json:

{
  "timestamp": 1559347670,
  "p_7_1_0": 6,
  "px_2_7_1_0": 1,
  "pv_7_1_1": 1
}

预期输出 JSON:

{
  "values": [
    {
      "key": "p_7_1_0",
      "value": 6,
      "timestamp": 1559347670
    },
    {
      "key": "px_2_7_1_0",
      "value": 1,
      "timestamp": 1559347670
    },
    {
      "key": "pv_7_1_1",
      "value": 1,
      "timestamp": 1559347670
    }
  ]
}

提前致谢

Answer 1

读完这个问题后JOLT transformation to copy single value along an array

以及答案 https://stackoverflow.com/a/50438480/2733184

我发现你想要的东西出奇地相似。然而，我永远不会提出需要提出的问题。

我鼓励您阅读前面提到的问题和答案，阅读所有内容(包括规范中的评论)并给他们一些支持。

[
  {
    "operation": "shift",
    "spec": {
      "timestamp": "timestamp",
      // put everything but the timestamp in a member (the pivot)
      "*": "all.&"
    }
  },
  {
    "operation": "shift",
    "spec": {
      "all": {
        "*": {
          // grab the member key and put it in its final place
          "$": "values[#2].key",
          // grab the member value and put it in its final place
          "@": "values[#2].value",
          // Walk back two steps (* -> all -> root) and grab the timestamp
          "@(2,timestamp)": "values[#2].timestamp"
          // I wish I understood the logic behind "#2" but I don't
          // and I'll have to read on it further
        }
      }
    }
  }
]

我希望有人能解释一下#的用途。我的直接猜测是它类似于 & (成员名称)，但看起来像是成员职位(？)。