Mulesoft Dataweave表达式引发错误

Question

Check image to view mule4 screen我正在使用mule4构建集成流，Dataweave表达式用于数据转换，postman用于测试HTTP调用，我试图从下面的Dataweave中的XML中获取0011x000014VegoAAC，并将其插入到Salesforce记录中，直到我添加了这两行(它们应该从XML中提取0011x000014VegoAAC )

PBSI__Customer__c: (payload.ns0#order.ns0#"custom-attributes".*ns0#"custom-attribute") 
    filter (item) -> (item.@"attribute-id" == "sscAccountid") 

XML

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<order order-no="00000907" xmlns="http://www.demandware.com/xml/impex/order/2006-10-31">
    <order-date>2020-07-10T08:57:05.076Z</order-date>
    <current-order-no>00000907</current-order-no>
    <product-lineitems>
        <product-lineitem>
            <net-price>54.17</net-price>
        </product-lineitem>
    </product-lineitems>
    <custom-attributes>
        <custom-attribute attribute-id="Adyen_pspReference">852594371442812G</custom-attribute>
        <custom-attribute attribute-id="Adyen_value">7099</custom-attribute>
        <custom-attribute attribute-id="sscAccountid">0011x000014VegoAAC</custom-attribute>
    </custom-attributes>
</order>

完整的Dataweave代码

 %dw 2.0
    output application/java
    ns ns0 http://www.demandware.com/xml/impex/order/2006-10-31
    ---
    [{  
        Ascent4Ecomm__Ecomm_Order_ID__c: payload.ns0#order.ns0#"original-order-no",
        Ascent4Ecomm__Ecomm_Order_Name__c: payload.ns0#order.ns0#"original-order-no",
        Ascent4Ecomm__Ecomm_Order_Number__c: payload.ns0#order.ns0#"original-order-no", 
        attributes: {
            "type": "PBSI__PBSI_Sales_Order__c",
            "referenceId": "SO"
        },
        PBSI__Sales_Order_Lines__r: {
            records: payload.ns0#order.ns0#"product-lineitems".*ns0#"product-lineitem" map ( e , empindex ) -> {
                "attributes": {
                    "type": "PBSI__PBSI_Sales_Order_Line__c",
                    "referenceId": e.ns0#"product-id"
                },
                "PBSI__Item__c": e.ns0#"custom-attributes".ns0#"custom-attribute",
                "PBSI__ItemDescription__c": e.ns0#"product-name"
            }
        },
***These two lines throws error:***
        PBSI__Customer__c: (payload.ns0#order.ns0#"custom-attributes".*ns0#"custom-attribute")
            filter (item) -> (item.@"attribute-id" == "sscAccountid")
    }]

错误

:Invalid status code: 400, response body: [{"message":"Cannot deserialize instance of reference from START_ARRAY value [line:1, column:423]","errorCode":"JSON_PARSER_ERROR"}]

在这两个linesMule4屏幕出现之前，一切都运行正常

我使用postman对该流进行HTTP调用

Answer 1

这是一个HTTP 400错误。该描述表明某个应用程序正在尝试解析JSON输入。不清楚与您的DataWeave转换的关系，但是它输出的是Java，而不是JSON。您可能需要将输出更改为application/JSON。

更新:根据评论，您需要从PBSI__Customer__c返回带有某个id的单个字符串，这将从问题中的DataWeave表达式返回一个列表，您需要获取第一个元素。您可以使用索引选择器[0]来实现这一点，尽管我不知道是否可以保证有效负载始终只有一个元素。

PBSI__Customer__c: ((payload.ns0#order.ns0#"custom-attributes".*ns0#"custom-attribute")
        filter (item) -> (item.@"attribute-id" == "sscAccountid")) [0]