Json NiFi，Jolt'；"安全行动"；“子字符串”；不'；行不通

我有一些日期时间标记，我假装在它之前的一刻钟把它分组

例如，我有以下数据：

[
  {
    "id": "123",
    "dateTime": "2020-07-08T08:49:50+02:00",
    "value": "1"
  },
  {
    "id": "123",
    "dateTime": "2020-07-08T13:14:57+02:00",
    "value": "1"
  },
  {
    "id": "123",
    "dateTime": "2020-07-08T13:15:15+02:00",
    "value": "1"
  },
  {
    "id": "123",
    "dateTime": "2020-07-08T13:36:39+02:00",
    "value": "1"
  }
]

[ {
  "id" : "123",
  "dateHour" : "2020-07-08T08",
  "minutes" : "45",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "0",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "15",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "30",
  "value" : "1"
} ]

经过一些颠簸变换后，我得到了以下数据：

[
  {
    "id": "123",
    "dateTime": "2020-07-08T08:49:50+02:00",
    "value": "1"
  },
  {
    "id": "123",
    "dateTime": "2020-07-08T13:14:57+02:00",
    "value": "1"
  },
  {
    "id": "123",
    "dateTime": "2020-07-08T13:15:15+02:00",
    "value": "1"
  },
  {
    "id": "123",
    "dateTime": "2020-07-08T13:36:39+02:00",
    "value": "1"
  }
]

[ {
  "id" : "123",
  "dateHour" : "2020-07-08T08",
  "minutes" : "45",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "0",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "15",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "30",
  "value" : "1"
} ]

这里，我有个问题。有了这个网页，我成功地用下面的代码转换了“00”中的“0”

[
{ "operation": "modify-overwrite-beta", 
  "spec": { 
    "*": { 
      "minutes": "=concat('0',@(0))" 
    } 
  } 
},
{ "operation": "modify-overwrite-beta", 
  "spec": { 
    "*": { 
      "minutes": "=substring(@(1,minutes),1,3)" 
    }
  }
}
]

预期输出（并通过网页实现）：

NiFi中的实际输出：

[ {
  "id" : "123",
  "dateHour" : "2020-07-08T08",
  "minutes" : "045",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "00",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "015",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "030",
  "value" : "1"
} ]

---

由于某些原因，“=substring（）”函数在NiFi中无法正常工作。有没有人有什么诀窍来获取字符串的最后两项？

您可以将其转换为数字并左键填充。看看是否有帮助

[
  {
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": {
        "minutes": ["=toInteger", 0]
      }
    }
  },
  {
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": {
        "minutes": "=toString"
      }
    }
  },
  {
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": {
        "minutes": "=leftPad(@(1,minutes),2,'0')"
      }
    }
  }
]

输入：

[
  {
    "id": "123",
    "dateHour": "2020-07-08T08",
    "minutes": "045",
    "value": "1"
  },
  {
    "id": "123",
    "dateHour": "2020-07-08T13",
    "minutes": "00",
    "value": "1"
  },
  {
    "id": "123",
    "dateHour": "2020-07-08T13",
    "minutes": "015",
    "value": "1"
  },
  {
    "id": "123",
    "dateHour": "2020-07-08T13",
    "minutes": "030",
    "value": "1"
  }
]

输出：

[ {
  "id" : "123",
  "dateHour" : "2020-07-08T08",
  "minutes" : "45",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "00",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "15",
  "value" : "1"
}, {
  "id" : "123",
  "dateHour" : "2020-07-08T13",
  "minutes" : "30",
  "value" : "1"
} ]

---

我无法更新NiFi的版本。它的版本是1.7.0，函数在其中工作的processorThat也是，但在NiFi 1.7.0中不工作：（感谢您的帮助