Question

我正在使用Mule 4，并且当有效载荷是字符串而不是具有以下结构时，我有一个值错误选择器：

{"status": 0, "content": {"status": "201",...........

我正在Mule 4中使用一个set变量来给出该值：

<set-variable value="#[if (payload.content? and payload.content.status? and payload.content.status &gt;= 200) payload.content.status else 500]" doc:name="Set Status" doc:id="e9ce4fd1-9664-4401-b9a2-e47913b689af" variableName="httpStatus"/>

我使用的条件是：

if (payload.content? and payload.content.status? and payload.content.status >= 200) payload.content.status else 500

但是有时服务器可以回答诸如“未授权”之类的字符串，那么payload.content不存在，仅仅是一个字符串。

当有效载荷是字符串时，设置变量给我这个错误

"\"You called the function 'Value Selector' with these arguments: \n 1: Binary (\"Richiesta Non Autorizzata\" as Binary {encoding: \"UTF-8\", mediaType: \"text/ht...)\n 2: Name (\"content\")\n\nBut it expects one of these combinations:\n (Array, Name)\n (Array, String)\n (Date, Name)\n (DateTime, Name)\n (LocalDateTime, Name)\n (LocalTime, Name)\n (Object, Name)\n (Object, String)\n (Period, Name)\n (Time, Name)\n\n1| if (payload.content? and payload.content.status? and payload.content.status >= 200) payload.content.status else 500\n ^^^^^^^^^^^^^^^\nTrace:\n at main (line: 1, column: 5)\" evaluating expression: \"if (payload.content? and payload.content.status? and payload.content.status >= 200) payload.content.status else 500\".",

Answer 1

使用payload.content.status default {}，或者将其默认为字符串或其他值，以后可以进行比较并使用。

Answer 2

我能想到的最好的方法是，而不是检查字段是否存在，而不是检查该值是否为Object，那么您可以确保.status可以正常工作

if (payload.content is Object and payload.content.status? and payload.content.status >= 200) 
    payload.content.status 
else 500

如何在设置变量（第4项）中验证参数是否存在而没有值选择器错误？

2 个答案: