Mule 4 OuterJoin和创建新的阵列。

Question

我在Mule 4上（dataweave 2.0），我的代码如下。

%dw 2.0
import * from dw::core::Arrays
output application/json
var var1 = [
  {"ID": 1000, "ID_2": "ABC-1000"},
  {"ID": 2000, "ID_2": "DEF-2000"},
  {"ID": 3000, "ID_2": "GHI-3000"}
]
var var2 = [
  {"EID": "ABC-1000", "GUID": "A0F4960AE5E54459A1B1FB40297EF893"},
  {"EID": "DEF-2000", "GUID": "63F6A192988A4C0696B117E9AC080611"},
  {"EID": "GHI-3000", "GUID": "A0FB600FA73E4E3BBF1CB59AA6E92AEF"}
]
---
outerJoin(var1, var2, (obj) -> (obj.ID_2), (obj) -> (obj.EID))

我得到的输出是：

[
  {
    "l": {"ID": 1000, "ID_2": "ABC-1000"},
    "r": {"EID": "ABC-1000", "GUID": "A0F4960AE5E54459A1B1FB40297EF893"}
  },
  {
    "l": {"ID": 2000, "ID_2": "DEF-2000"},
    "r": {"EID": "DEF-2000", "GUID": "63F6A192988A4C0696B117E9AC080611"}
  },
  {
    "l": {"ID": 3000, "ID_2": "GHI-3000"},
    "r": {"EID": "GHI-3000", "GUID": "A0FB600FA73E4E3BBF1CB59AA6E92AEF"}
  }
]

预期的输出如下图所示。我需要将左右两边的输出都扁平化，同时引入一个静态属性。

[
    {"Key1": "1000", "Key2": "ABC-1000", "Name": "Test", "GUID": "A0F4960AE5E54459A1B1FB40297EF893"},
    {"Key2": "2000", "Key2": "DEF-2000", "Name": "Test", "GUID": "63F6A192988A4C0696B117E9AC080611"},
    {"Key3": "3000", "Key2": "GHI-3000", "Name": "Test", "GUID": "A0FB600FA73E4E3BBF1CB59AA6E92AEF"}
]

请赐教。

Answer 1

试试这个，但注意我把你的 outerJoin 到 join:

%dw 2.0
import * from dw::core::Arrays
output application/json
var var1 = [
  {"ID": 1000, "ID_2": "ABC-1000"},
  {"ID": 2000, "ID_2": "DEF-2000"},
  {"ID": 3000, "ID_2": "GHI-3000"}
]
var var2 = [
  {"EID": "ABC-1000", "GUID": "A0F4960AE5E54459A1B1FB40297EF893"},
  {"EID": "DEF-2000", "GUID": "63F6A192988A4C0696B117E9AC080611"},
  {"EID": "GHI-3000", "GUID": "A0FB600FA73E4E3BBF1CB59AA6E92AEF"}
]
---
join(var1, var2, (obj) -> (obj.ID_2), (obj) -> (obj.EID))
reduce (e, acc=[]) -> (
    acc + {
        Key1: e.l.ID,
        Key2: e.l.ID_2,
        Name: "Test",
        GUID: e.r.GUID
    }
)

说明在左边或右边没有匹配记录的情况下，输出数据是什么样子的，然后我就可以切换回。outerJoin