数据编织的数组输出中出现空条目

Question

我正在使用 Anypoint Studio 7.3 和 Mule 4.2。

我正在转换一个有效负载，但我在新数组的末尾得到一个随机空值，无法弄清楚为什么在我处理此记录时它会出现。

谁能看出为什么会出现这个问题？

Dataweave 代码

%dw 2.0
output application/json
---
payload.records flatMap
    ((record, index) ->
        records.customers flatMap ((customer, index) ->
            customers.transactions flatMap ((transaction, index) ->
                transaction.prices filter (!isEmpty($)) map ((price, index) ->
                {
                    recordId: record.recordId,
                    customerId: customer.customerId,
                    transactionId: transaction.sessionId,
                    name: customer.name,
                    value: price.value
                })
            )
        )
    )

输入JSON

{
    "records": [
        {
            "recordId": "f4f80bc7",
            "customers": [
                {
                    "customerId": "a1f773b8",
                    "name": "J Smith",
                    "transactions": [
                        {
                            "transactionId": "f610bac1"
                            "prices": [
                                {
                                    "value": 580
                                },
                                {
                                    "value": 8403,
                                },
                                {
                                    "value": 8983
                                }
                            ]
                        }
                    ]
                }
            ]
        }
    ]
}

输出 JSON 随机 null

[
  {
    "recordId": "f4f80bc7",
    "customerId": "a1f773b8",
    "transationId": "f610bac1",
    "name": "J Smith",
    "value": 580
  },
  {
    "recordId": "f4f80bc7",
    "customerId": "a1f773b8",
    "transationId": "f610bac1",
    "name": "J Smith",
    "value": 8403
  },
  {
    "recordId": "f4f80bc7",
    "customerId": "a1f773b8",
    "transationId": "f610bac1",
    "name": "J Smith",
    "value": 8983
  },
  null
]

感谢您的帮助

Answer 1

您可以使用编写器属性 skipNullOn 跳过数组中的空元素。

output application/json skipNullOn="arrays".

这里只是评论：使用您的 DW 脚本和输入，我无法在 Mule 4.2 中使用 null 元素重现您的输出

数据编织的数组输出中出现空条目

Null entry appearing in array output from dataweave

mule

anypoint-studio

dataweave