Mule Dataweave - 如何设置 http.status

Question

我想在 Dataweave 转换中设置为 http.status 代码。为此，我使用以下代码在 Outbound Property 选项卡上设置 http.status：

出站属性 ===> http.status

%dw 1.0
%output application/java
---
"404" when payload[0] == null
otherwise "200"

但是即使payload为null也不反映。有什么建议吗？

编辑：

完整的 Dataweave 代码供参考

<dw:transform-message doc:name="buildResponse">
    <dw:set-payload>
        <![CDATA[%dw 1.0 
        %input payload application/java
        %output application/json
        ---
        {
            "customer": {
                "id": payload[0].ID, 
                "name": payload[0].NAME,
                "age": payload[0].AGE,
                "address": {
                    "line1": payload[0].LINE1,
                    "line2": payload[0].LINE2,
                    "city": payload[0].CITY,
                    "state": payload[0].STATE,
                    "pincode": payload[0].PINCODE
                }
            }
        } when (sizeOf payload) > 0
        otherwise 
        {
            "customer" : "not found"
        }]]>
    </dw:set-payload>
    <dw:set-property propertyName="http.status">
        <![CDATA[%dw 1.0
        %output application/java
        ---
        "404" when (sizeOf payload) == 0
        otherwise "200"]]>
    </dw:set-property>
</dw:transform-message>

Answer 1

编辑。

这是因为 dataweave 脚本的第一部分正在将负载覆盖到 JSON。因此，当您在 set-属性 dw 脚本中使用 sizeOf 时，它实际上是在执行 JSON 字符串的 sizeOf，该字符串不是 0.

为了完成这项工作，我可能会将原始有效负载存储在 flowVar 中，然后像这样在 dw 脚本中使用它：

<http:listener-config name="HTTP_Listener_Configuration"
        host="0.0.0.0" port="8085" doc:name="HTTP Listener Configuration" />
    <flow name="dataweave-testFlow">
        <http:listener config-ref="HTTP_Listener_Configuration"
            path="/test" doc:name="HTTP" />
        <set-payload value="#[[]]" doc:name="Set Payload" />
        <set-variable variableName="originalPayload" value="#[payload]"
            doc:name="Variable" />
        <dw:transform-message doc:name="buildResponse">

            <dw:set-payload>
        <![CDATA[%dw 1.0 
        %input payload application/java
        %output application/json
        ---
        {
            "customer": {
                "id": payload[0].ID, 
                "name": payload[0].NAME,
                "age": payload[0].AGE,
                "address": {
                    "line1": payload[0].LINE1,
                    "line2": payload[0].LINE2,
                    "city": payload[0].CITY,
                    "state": payload[0].STATE,
                    "pincode": payload[0].PINCODE
                }
            }
        } when (sizeOf payload) > 0
        otherwise 
        {
            "customer" : "not found"
        }]]>
            </dw:set-payload>
            <dw:set-property propertyName="http.status">
        <![CDATA[%dw 1.0
        %output application/java
        ---
        "404" when (sizeOf flowVars.originalPayload) == 0
        otherwise "200"]]>
            </dw:set-property>
        </dw:transform-message>
    </flow>

我认为这是 Dataweave 的错误并在此处创建：https://www.mulesoft.org/jira/browse/MULE-9021

Answer 2

Ryan Carter 的回答是正确的。但是，没有将原始有效负载存储到流变量中，有一个特定的答案。

<dw:transform-message doc:name="buildResponse">
    <dw:set-payload>
        <![CDATA[%dw 1.0 
        %input payload application/java
        %output application/json
        ---
        {
            "customer": {
                "id": payload[0].ID, 
                "name": payload[0].NAME,
                "age": payload[0].AGE,
                "address": {
                    "line1": payload[0].LINE1,
                    "line2": payload[0].LINE2,
                    "city": payload[0].CITY,
                    "state": payload[0].STATE,
                    "pincode": payload[0].PINCODE
                }
            }
        } when (sizeOf payload) > 0
        otherwise 
        {
            "customer" : "not found"
        }]]>
    </dw:set-payload>
    <dw:set-property propertyName="http.status">
        <![CDATA[%dw 1.0
        %output application/java
        ---
        "404" when payload.customer == "not found"
        otherwise "200"]]>
    </dw:set-property>
</dw:transform-message>

我喜欢这样："404" when payload.customer == "not found"

Mule Dataweave - 如何设置 http.status

Mule Dataweave - How to set http.status

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