使用 Dataweave 2.0 转换 JSON Object

Question

我收到来自 API GET 请求的 JSON 响应到我的 Mule 流中，看起来有点像下面的 JSON。 我正在尝试 map 以实现 output 列表，其中每个客户看起来有点像下面。 问题是位于自定义属性下的公司卡号，而且我一直在底部显示错误。 我试图使用有效载荷 map (value,key) function 这给了我这个错误。 当我使用 pluck 时，我会在 id、firstname 等下列出所有项目，但我希望它们单独出现重复列表。
谢谢！

{
    "items": [
        {
            "id": 17837,
            "group_id": 2,
            "email": "catherinebrugge@tprg.com",
            "firstname": "Catherine5",
            "lastname": "Brugge",
            "custom_attributes": [
                {
                    "attribute_code": "customer_id",
                    "value": "29a8-303b-01c7fe28"
                }
            ]
        },
        {
            "id": 17839,
            "group_id": 2,
            "email": "catherineb@123.com",
            "firstname": "Catherine",
            "lastname": "Brugge",
            "website_id": 2,
            "addresses": [
                {
                    "id": 33773,
                    "customer_id": 17839,
                    "region": {
                        "region_code": null,
                    },
                    "region_id": 0,
                    "street": [
                        "123 Kings Road"
                    ],
                    "default_billing": true
                }
            ],
            "disable_auto_group_change": 0,
            "custom_attributes": [
                {
                    "attribute_code": "company_card_number",
                    "value": "100000000"
                },
                {
                    "attribute_code": "ustomer_id",
                    "value": "29a8-c3443e-014062"
                }
            ]
        },
        {
            "id": 18357,
            "group_id": 2,
            "email": "catherinebrugge@543.com",
            "firstname": "Catherine",
            "lastname": "Brugge",
            "custom_attributes": [
                {
                    "attribute_code": "company_card_number",
                    "value": "888243"
                },
                {
                    "attribute_code": "customer_id",
                    "value": "2b02-88583c-021559"
                }
            ]
        }
    ],
    "search_criteria": {
        "filter_groups": [
            {
                "filters": [
                    {
                        "field": "group_id",
                        "value": "2",
                        "condition_type": "equal"
                    }
                ]
            }
        ]
    },
    "total_count": 3
}

You called the function 'map' with these arguments: 

1: Object ({items: [{id: ...)
 2: Function ((value:Any, key:Any) -> ???)

{
    "customers":{
        "id": payload.items.id,
        "group_id": payload.items.group_id,
        "firstname":payload.firstname,
        "lastname": payload.lastname,
        "email": payload.email,
        "company_card_number": ???
        }
}

Answer 1

对您要查找的内容进行了一些猜测。

%dw 2.0
output application/json  skipNullOn="everywhere"

fun getCardNumber(customer) = customer.custom_attributes[?($.attribute_code == 'company_card_number')][0].value

---
customers:payload.items map ($ - "custom_attributes" ++ "company_card_number": getCardNumber($))