Jolt JSON 空问题

Question

我对 JSON\

的 Jolt 转换有疑问

输入JSON：

{
  "_id": "6218e53465793fa20ea11524",
  "patientorderitems": [
    {
      "poi_id": "6218e53465793fa20ea1152a",
      "patientorderlogs": [
        {
          "pol_id": "6218e53465793fa20ea1152e",
          "useruid": "61ee4995f16eebb6b7e1c644",
          "modifiedat": "2022-02-25T17:18:28Z"
        },
        {
          "pol_id": "6218e53465793fa20ea1152c",
          "useruid": "61ee4995f16eebb6b7e1c643",
          "modifiedat": "2022-02-25T17:18:28Z"
        }
      ]
    },
    {
      "poi_id": "6218e53465793fa20ea11525",
      "patientorderlogs": [
        {
          "pol_id": "6218e53465793fa20ea11529",
          "useruid": "61ee4995f16eebb6b7e1c644",
          "modifiedat": "2022-02-25T17:18:28Z"
        }
      ]
    },
    {
      "poi_id": "6218e53465793fa20ea11525",
      "patientorderlogs": [
        {
          "pol_id": "6218e53465793fa20ea11529",
          "useruid": "61ee4995f16eebb6b7e1c644",
          "modifiedat": "2022-02-25T17:18:28Z"
        }
      ]
    },
    {
      "poi_id": "6218e53465793fa20ea11525",
      "patientorderlogs": [
        {
          "pol_id": "6218e53465793fa20ea11529",
          "useruid": "61ee4995f16eebb6b7e1c644",
          "modifiedat": "2022-02-25T17:18:28Z"
        },
        {
          "pol_id": "6218e53465793fa20ea11529",
          "useruid": "61ee4995f16eebb6b7e1c644",
          "modifiedat": "2022-02-25T17:18:28Z"
        },
        {
          "pol_id": "6218e53465793fa20ea11529",
          "useruid": "61ee4995f16eebb6b7e1c644",
          "modifiedat": "2022-02-25T17:18:28Z"
        },
        {
          "pol_id": "6218e53465793fa20ea11529",
          "useruid": "61ee4995f16eebb6b7e1c644",
          "modifiedat": "2022-02-25T17:18:28Z"
        },
        {
          "pol_id": "6218e53465793fa20ea11529",
          "useruid": "61ee4995f16eebb6b7e1c644",
          "modifiedat": "2022-02-25T17:18:28Z"
        }
      ]
    }
  ]
}

JOLT规格：

[
  {
    "operation": "shift",
    "spec": {
      "patientorderitems": {
        "*": {
          "patientorderlogs": {
            "*": {
              "@(4,_id)": "&1.[&3]._id",
              "@(2,poi_id)": "&1.[&3].poi_id",
              "*": "&1.[&3].&" // combine all innermost attributes by "*" wildcard
            }
          }
        }
      }
    }
  },
  {
    //get rid of indexes and wrapper brackets
    "operation": "shift",
    "spec": {
      "*": {
        "*": ""
      }
    }
  }
]

输出：

[ {
  "_id" : "6218e53465793fa20ea11524",
  "poi_id" : "6218e53465793fa20ea1152a",
  "pol_id" : "6218e53465793fa20ea1152e",
  "useruid" : "61ee4995f16eebb6b7e1c644",
  "modifiedat" : "2022-02-25T17:18:28Z"
}, {
  "_id" : "6218e53465793fa20ea11524",
  "poi_id" : "6218e53465793fa20ea11525",
  "pol_id" : "6218e53465793fa20ea11529",
  "useruid" : "61ee4995f16eebb6b7e1c644",
  "modifiedat" : "2022-02-25T17:18:28Z"
}, {
  "_id" : "6218e53465793fa20ea11524",
  "poi_id" : "6218e53465793fa20ea11525",
  "pol_id" : "6218e53465793fa20ea11529",
  "useruid" : "61ee4995f16eebb6b7e1c644",
  "modifiedat" : "2022-02-25T17:18:28Z"
}, {
  "_id" : "6218e53465793fa20ea11524",
  "poi_id" : "6218e53465793fa20ea11525",
  "pol_id" : "6218e53465793fa20ea11529",
  "useruid" : "61ee4995f16eebb6b7e1c644",
  "modifiedat" : "2022-02-25T17:18:28Z"
}, {
  "_id" : "6218e53465793fa20ea11524",
  "poi_id" : "6218e53465793fa20ea1152a",
  "pol_id" : "6218e53465793fa20ea1152c",
  "useruid" : "61ee4995f16eebb6b7e1c643",
  "modifiedat" : "2022-02-25T17:18:28Z"
}, null, null, {
  "_id" : "6218e53465793fa20ea11524",
  "poi_id" : "6218e53465793fa20ea11525",
  "pol_id" : "6218e53465793fa20ea11529",
  "useruid" : "61ee4995f16eebb6b7e1c644",
  "modifiedat" : "2022-02-25T17:18:28Z"
}, null, null, null, {
  "_id" : "6218e53465793fa20ea11524",
  "poi_id" : "6218e53465793fa20ea11525",
  "pol_id" : "6218e53465793fa20ea11529",
  "useruid" : "61ee4995f16eebb6b7e1c644",
  "modifiedat" : "2022-02-25T17:18:28Z"
}, null, null, null, {
  "_id" : "6218e53465793fa20ea11524",
  "poi_id" : "6218e53465793fa20ea11525",
  "pol_id" : "6218e53465793fa20ea11529",
  "useruid" : "61ee4995f16eebb6b7e1c644",
  "modifiedat" : "2022-02-25T17:18:28Z"
}, null, null, null, {
  "_id" : "6218e53465793fa20ea11524",
  "poi_id" : "6218e53465793fa20ea11525",
  "pol_id" : "6218e53465793fa20ea11529",
  "useruid" : "61ee4995f16eebb6b7e1c644",
  "modifiedat" : "2022-02-25T17:18:28Z"
} ]

我期望 JSONS 的数组没有空值
为什么我得到空数组

我可以对震动规范做任何更改吗？ ..................................................... ..................................................... ..................................................... .....................................

Answer 1

您可以通过添加 @(3,poi_id) 作为值（作为右侧，将所需级别从 2 提高到 3)为了区分对象多如

[
  {
    "operation": "shift",
    "spec": {
      "patientorderitems": {
        "*": {
          "patientorderlogs": {
            "*": {
              "@(4,_id)": "@(3,poi_id)[&3].&1._id",
              "@(2,poi_id)": "@(3,poi_id)[&3].&1.poi_id",
              "*": "@(3,poi_id)[&3].&1.&"
            }
          }
        }
      }
    }
  },
  {
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "*": ""
        }
      }
    }
  }
]

在这种情况下，您还将摆脱 nulls 作为添加一个额外的级别（"*": {..}) 最后一个规格。

网站上的演示 http://jolt-demo.appspot.com/ 是

Jolt JSON 空问题

Jolt JSON null issue

json

jolt

apache-nifi