需要根据其他列中的值填充列中的自定义序列索引，以便在 Mulesoft 中使用 Data Weave

编程问答 2022-06-01

问题描述

我需要根据另一列中的值在列中写入一个序列/索引。 请在下面找到示例来解释我的请求： 在这里，我需要根据颜色列中的值在 customindex 列中生成索引值..所以基本上如果列中有 4 行带有红色，那么它应该将行索引为 1,2,3,4 然后当它的 2 行以蓝色为值，它应该再次从 1 -> 1,2 索引。

输入数据：

[
  {
    "Type": "Header","Color": "Red","Customindex": "","code":"H1",},{
    "Type": "Header","Color": "Blue","code":"H2",{
    "Type": "LineItem","code":"L1","code":"L1"
    },"code":"L2"
    },"Color": "Yellow","code":"H3"
    },"code":"L3"
    },"code":"L2"
    }
]

这是我需要帮助的转换：

%dw 2.0
output application/json
var TM = flatten(payload map ((item,index) ->
[{
"Type":payload.type,//HEADER VALUES
"Color":"","Customindex":"","code":"",}]++
[{
"Type":payload.type,// LINE ITEM VALUES
"Color":payload.color,"Customindex":index,//need the index sequence to only count similar colors
"code":"",}]))
---
(((TM distinctBy $ ... filters and groupings

包含详细信息的示例数据（这是预期的输出 - 应仅适用于订单项）：

enter image description here

解决方法

这对你有用吗？

输入：

[
    {
        "Type": "Header","Color": "Red","Customindex": "","code": "H1"
    },{
        "Type": "Header","Color": "Blue","code": "H2"
    },"Color": "Green","code": "H4"
    },{
        "Type": "LineItem","code": "L4"
    },"code": "L1"
    },"code": "L2"
    },"Color": "Yellow","code": "H3"
    },"code": "L3"
    },"code": "L2"
        
    }
]

脚本：

%dw 2.0
output application/csv
fun buildHeader(code) = {
     'Type': 'Header',"Color": "","CustomIndex":"","Code":code
}

fun buildFirstLineItem(code,color,ci) = {
     'Type': 'LineItem',"Color": color,"CustomIndex":ci,"Code":code replace ("H") with ("L")
}
---

flatten(payload orderBy $.code groupBy $.Color mapObject {
    a: flatten($ map (
    if($.'Type' == 'Header')
     [buildHeader($.code)] + [buildFirstLineItem($.code,$.Color,(($$)+1))][0]
     else
      {
      'Type': "LineItem","Color": $.Color,"CustomIndex": (($$)+1),"Code":$.code 
      }
      ))
 }pluck($))

输出：

Type,Color,CustomIndex,Code
Type,Code
Header,H1
LineItem,Red,1,L1
LineItem,2,3,L1
Header,H2
LineItem,Blue,L2
LineItem,L2
Header,H3
LineItem,Yellow,L3
LineItem,L3
Header,H4
LineItem,Green,L4
LineItem,4,5,L4
dataweavemule4