Mule 4 dataweave 2 - 如何对包含其他对象的 json 对象进行排序

Question

我需要对一个 json 对象（不是数组）进行排序，它不是一个简单的键值 相反，它里面有额外的对象

{
"Memo": {
    "itemAmount1": "5",
    "taxName1": "TAX",
    "productPrice1": "10",
    "accountName1": "Account Receivable (Debtors)"
},
"Footer": {
    "productDescription2": "Maggie",
    "itemQuantity2": "49.5",
    "accountName2": "Account Receivable (Debtors)",
    "taxName2": "TAX"
},
"Header": {
    "itemDiscount3": "10",
    "accountName3": "Account Receivable (Debtors)",
    "productPrice3": "10",
    "taxName3": "TAX"
}
}

预期输出是：（也应该对内部对象的键进行排序）

 {
"Footer": {
    "accountName2": "Account Receivable (Debtors)",
    "itemQuantity2": "49.5",
    "productDescription2": "Maggie",
    "taxName2": "TAX"
},
"Header": {
    "accountName3": "Account Receivable (Debtors)",
    "itemDiscount3": "10",
    "productPrice3": "10",
    "taxName3": "TAX"
},
"Memo": {
    "accountName1": "Account Receivable (Debtors)",
    "itemAmount1": "5",
    "productPrice1": "10",
    "taxName1": "TAX"
}
}

不一定是 2 级对象层次结构，它可能包含需要排序的 n 级对象层次结构。

这个问题是所问问题的虚拟复制粘贴here（但那是针对javascript而不是dataweave / mule）

Answer 1

内置函数

orderBy()

也可以对对象进行排序。但要对子对象进行排序，您需要一个递归函数，该函数将

orderBy()

应用于按类型匹配的子对象。

%dw 2.0
output application/json
fun sortObjects(x)=
    x match {
        case o is Object -> o 
                              orderBy ((value, key) -> key)
                              mapObject (($$): sortObjects($))
        else -> $
  }
---
sortObjects(payload)

输出：

{
  "Footer": {
    "accountName2": "Account Receivable (Debtors)",
    "itemQuantity2": "49.5",
    "productDescription2": "Maggie",
    "taxName2": "TAX"
  },
  "Header": {
    "accountName3": "Account Receivable (Debtors)",
    "itemDiscount3": "10",
    "productPrice3": "10",
    "taxName3": "TAX"
  },
  "Memo": {
    "accountName1": "Account Receivable (Debtors)",
    "itemAmount1": "5",
    "productPrice1": "10",
    "taxName1": "TAX"
  }
}

请注意，向

Array

添加匹配项，您可以使用该函数同时对数组进行排序。