NiFi 中的 JoltTransformJSON 處理器（沒有任何父標簽的 json）

Question

我需要使用Nifi 中的 JoltTransformJSON轉換 JSON 數據，這是我用於轉換的規范：

[{
"operation": "shift",
"spec": {
    "*": {
        "Header": {
            "readOn": "created_date_time",
            "fileName": "readFile"
        },
        "Data": {
            "id": "Id",
            "first_name": "First_Name",
            "last_name": "Last_Name",
        }
    }
}}]

我的輸入數據：

[{
"Header": {
    "readOn": "2017/04/18 10:55:05",
    "fileName": "sample1.csv",
    "recordNum": 1
},
"Data": {
    "last_name": "Martin",
    "id": 21,
    "first_name": "Clarence"
}
}, {
"Header": {
    "readOn": "2017/04/18 10:55:05",
    "fileName": "sample.csv",
    "recordNum": 2
},
"Data": {
    "last_name": "Graham",
    "id": 22,
    "first_name": "Walter"
}
}]

輸出我得到的：

{
"created_date_time": ["2017/04/18 10:55:05", "2017/04/18 10:55:05"],
"readFile": ["sample1.csv", "sample2.csv"],
"Id": [21, 22],
"First_Name": ["Clarence", "Walter"],
"Last_Name": ["Martin", "Graham"]
}

所需的輸出：

[{
"recordNum": 1,
"Header": {
    "created_date_time": "2017/04/18 10:55:05",
    "readFile": "getusroi.csv"
},
"Data": {
    "Last_Name": "Martin",
    "Id": 21,
    "First_Name": "Clarence"
}
}, {
"recordNum": 2,
"Header": {
    "created_date_time": "2017/04/18 10:55:05",
    "readFile": "getusroi.csv"
},
"Data": {
    "Last_Name": "Graham",
    "Id": 22,
    "First_Name": "Walter"
}
}]

問題：有人可以指導我在哪里更改我的震動規格以實現所需的轉換輸出。

Answer 1

訣竅是返回樹直到到達數組中的元素，然后您可以在目標中引用該索引。 試試這個規范：

[
  {
    "operation": "shift",
    "spec": {
      "*": {
        "Header": {
          "recordNum": "[&2].recordNum",
          "readOn": "[&2].&1.created_date_time",
          "fileName": "[&2].&1.readFile"
        },
        "Data": {
          "id": "[&2].&1.Id",
          "first_name": "[&2].&1.First_Name",
          "last_name": "[&2].&1.Last_Name"
        }
      }
    }
  }
]