JSON 数组迭代 - Mulesoft 4 中的树遍历

Question

输入 JSON：

     {
        "id": "/",
        "code": "/",
        "typeCode": "CPC",
        "timeStamp": "2021-11-16T17:00:00-06:00",
        "childList": [
            {
                "id": "577-1-1",
                "code": "1111",
                "name": "Electronics-1-1",
                "displayName": "Electronics-1-1",
                "active": true,
                "languageCode": "en",
                "typeCode": "CPC",
                "childList": [
                    {
                        "id": "579-2-1",
                        "code": "2222",
                        "name": "Calculators-2-1",
                        "displayName": "Calculators-2-1",
                        "active": true,
                        "languageCode": "en",
                        "typeCode": "CPC",
                        "childList": []
                    },
                    {
                        "id": "509-2-2",
                        "code": "3333",
                        "name": "Oven-2-2",
                        "displayName": "Oven-2-2",
                        "active": true,
                        "languageCode": "en",
                        "typeCode": "CPC",
                        "childList": [
                            {
                                "id": "749-3-1",
                                "code": "4444",
                                "name": "MicroOven-3-1",
                                "displayName": "MicroOven-3-1",
                                "active": true,
                                "languageCode": "en",
                                "typeCode": "CPC",
                                "childList": []
                            }
                        ]
                    }
                ]
            },
            {
                "id": "549-1-2",
                "code": "5555",
                "name": "Toys, Crafts & Leisure",
                "displayName": "Toys, Crafts & Leisure",
                "active": true,
                "languageCode": "en",
                "typeCode": "CPC",
                "childList": [
                    {
                        "id": "49674",
                        "code": "7605",
                        "name": "Pet Supplies",
                        "displayName": "Pet Supplies",
                        "active": true,
                        "languageCode": "en",
                        "typeCode": "CPC",
                        "childList": [
                            {
                                "id": "49684",
                                "code": "7615",
                                "name": "Beds & Houses",
                                "displayName": "Beds & Houses",
                                "active": true,
                                "languageCode": "en",
                                "typeCode": "CPC",
                                "childList": []
                            }
                        ]
                    }
                ]
            },
            {
                "id": "58782",
                "code": "0100",
                "name": "Fashion (new)",
                "displayName": "Fashion",
                "active": true,
                "languageCode": "en",
                "typeCode": "CPC",
                "childList": [
                    {
                        "id": "49056",
                        "code": "6958",
                        "name": "Blazers & Jackets, Etc. - Department",
                        "displayName": "Blazers & Jackets, Etc.",
                        "active": true,
                        "languageCode": "en",
                        "typeCode": "CPC",
                        "childList": [
                            {
                                "id": "50851",
                                "code": "7837",
                                "name": "Dusters PDM Name",
                                "displayName": "Dusters PDM Display Name",
                                "active": true,
                                "languageCode": "en",
                                "typeCode": "CPC",
                                "childList": []
                            }
                        ]
                    }
                ]
            }
        ]
    }

1. 预期的 XML 如下 - 此处的 categoryPath 必须注明 childElement 的完整地址，并且必须分组在第一个父 childList 下
2. 我们不会知道任何数组的确切子元素，即一个子列表中可能有“n”个子列表
3. 第一个 childlist 数组中有多少元素 - 必须在 xml 中形成这些 CategoryList 元素

注意：这里我只是以 2 个元素为例 - 但任何 childlist 数组都可以包含任意数量的 childlists 数组。

XML 转换：

<Category CategoryId="${childList.code}" CategoryPath="${childList.code}/${childList.childList.code}" Description="${childList.displayName}" ShortDescription="${childList.name}">
    <Extn ExtnSyncTS="${headers.timeStamp}"/>
</Category>

预期的 XML：

<CategoryListArray>
<CategoryList>
    <Category CategoryId="1111" CategoryPath="1111" Description="Electronics-1-1" ShortDescription="Electronics-1-1">
        <Extn ExtnSyncTS="2021-11-16T17:00:00-06:00"/>
    </Category>
    <Category CategoryId="2222" CategoryPath="1111/2222" Description="Calculators-2-1" ShortDescription="Calculators-2-1">
        <Extn ExtnSyncTS=" "/>
    </Category>
    <Category CategoryId="3333" CategoryPath="1111/3333" Description="Oven-2-2" ShortDescription="Oven-2-2">
        <Extn ExtnSyncTS="2021-11-16T17:00:00-06:00"/>
    </Category>
    <Category CategoryId="4444" CategoryPath="1111/3333/4444" Description="MicroOven-3-1" ShortDescription="MicroOven-3-1">
        <Extn ExtnSyncTS="2021-11-16T17:00:00-06:00"/>
    </Category>
</CategoryList>
<CategoryList>
    <Category CategoryId="5555" CategoryPath="5555" Description="Toys, Crafts & Leisure" ShortDescription="Toys, Crafts & Leisure">
        <Extn ExtnSyncTS="2021-11-16T17:00:00-06:00"/>
    </Category>
    <Category CategoryId="7605" CategoryPath="5555/7605" Description="Pet Supplies" ShortDescription="Pet Supplies">
        <Extn ExtnSyncTS="2021-11-16T17:00:00-06:00"/>
    </Category>
    <Category CategoryId="7615" CategoryPath="5555/7605/7615" Description="Beds & Houses" ShortDescription="Beds & Houses">
        <Extn ExtnSyncTS="2021-11-16T17:00:00-06:00"/>
    </Category>
</CategoryList>
<CategoryList>
    <Category CategoryId="0100" CategoryPath="0100" Description="Fashion" ShortDescription="Fashion (new)">
        <Extn ExtnSyncTS="2021-11-16T17:00:00-06:00"/>
    </Category>
    <Category CategoryId="6958" CategoryPath="0100/6958" Description=""Blazers & Jackets, Etc." ShortDescription="Blazers & Jackets, Etc. - Department">
        <Extn ExtnSyncTS="2021-11-16T17:00:00-06:00"/>
    </Category>
    <Category CategoryId="7837" CategoryPath="0100/6958/7837" Description="Dusters PDM Display Name" ShortDescription="Dusters PDM Name">
        <Extn ExtnSyncTS="2021-11-16T17:00:00-06:00"/>
    </Category>
</CategoryList>
</CategoryListArray>

Answer 1

我修改了之前的答案以支持新的输出。我使用了一个嵌套函数来重用之前未触及的方法，同时在顶部添加更改，因此脚本中只有一个函数可见。

%dw 2.0
output application/xml

fun mapToCategoriesArrayList(data) = do {
    fun mapChildren(x, timestamp, path)=
        x match {
            case o is Object -> 
                ([{
                    Category @(CategoryId: o.id, CategoryPath: (if (isEmpty(path)) "" else path ++ "/") ++ o.code, Description: o.name, ShortDescription: o.displayName ): {Extn: timestamp}
                }] 
                ++ mapChildren(o.childList, timestamp, (if (isEmpty(path)) "" else path ++ "/") ++ o.code)) 
            
            case a is Array -> 
                (a flatMap mapChildren($, timestamp, path) )
                
            else -> $
        }
    ---
    {
        CategoryListArray: 
            ( 
                data.childList map { 
                    CategoryList:
                          mapChildren($, data.timeStamp, "") 
                          reduce ((item, accumulator={}) -> accumulator ++ item ) 
                }
            ) reduce ((item, accumulator={}) -> accumulator ++ item ) 
    }
}
---
mapToCategoriesArrayList(payload)

输出：

<?xml version='1.0' encoding='UTF-8'?>
<CategoryListArray>
  <CategoryList>
    <Category CategoryId="577-1-1" CategoryPath="1111" Description="Electronics-1-1" ShortDescription="Electronics-1-1">
      <Extn>2021-11-16T17:00:00-06:00</Extn>
    </Category>
    <Category CategoryId="579-2-1" CategoryPath="1111/2222" Description="Calculators-2-1" ShortDescription="Calculators-2-1">
      <Extn>2021-11-16T17:00:00-06:00</Extn>
    </Category>
    <Category CategoryId="509-2-2" CategoryPath="1111/3333" Description="Oven-2-2" ShortDescription="Oven-2-2">
      <Extn>2021-11-16T17:00:00-06:00</Extn>
    </Category>
    <Category CategoryId="749-3-1" CategoryPath="1111/3333/4444" Description="MicroOven-3-1" ShortDescription="MicroOven-3-1">
      <Extn>2021-11-16T17:00:00-06:00</Extn>
    </Category>
  </CategoryList>
  <CategoryList>
    <Category CategoryId="549-1-2" CategoryPath="5555" Description="Toys, Crafts &amp; Leisure" ShortDescription="Toys, Crafts &amp; Leisure">
      <Extn>2021-11-16T17:00:00-06:00</Extn>
    </Category>
    <Category CategoryId="49674" CategoryPath="5555/7605" Description="Pet Supplies" ShortDescription="Pet Supplies">
      <Extn>2021-11-16T17:00:00-06:00</Extn>
    </Category>
    <Category CategoryId="49684" CategoryPath="5555/7605/7615" Description="Beds &amp; Houses" ShortDescription="Beds &amp; Houses">
      <Extn>2021-11-16T17:00:00-06:00</Extn>
    </Category>
  </CategoryList>
  <CategoryList>
    <Category CategoryId="58782" CategoryPath="0100" Description="Fashion (new)" ShortDescription="Fashion">
      <Extn>2021-11-16T17:00:00-06:00</Extn>
    </Category>
    <Category CategoryId="49056" CategoryPath="0100/6958" Description="Blazers &amp; Jackets, Etc. - Department" ShortDescription="Blazers &amp; Jackets, Etc.">
      <Extn>2021-11-16T17:00:00-06:00</Extn>
    </Category>
    <Category CategoryId="50851" CategoryPath="0100/6958/7837" Description="Dusters PDM Name" ShortDescription="Dusters PDM Display Name">
      <Extn>2021-11-16T17:00:00-06:00</Extn>
    </Category>
  </CategoryList>
</CategoryListArray>

更新：修复 CategoryList 分组