Question

我使用Dataweave将有效负载中的XML重新格式化为程序所期望的格式：

有效载荷

<reservation>
    <id>1</id>
    <begin_time>12:00 PM</begin_time>
    <end_time>1:00 PM</begin_time>
    <other_field>Misc. Data</other_field>
</reservation>
.
.
.

预期产出。

<reservation>
    <id>1</id>
    <begin_time>12:00 PM</begin_time>
    <schedule>
        <begin_time>12:00 PM</begin_time>
        <end_time>1:00 PM</end_time>
    </schedule>
</reservation>
.
.
.

Dataweave Code

%dw 1.0
%output application/xml
%namespace ns0 http://www.collegenet.com/r25
---
using (r = (flatten payload.ns0#reservations.*ns0#reservation))

    Reservation: r groupBy $.ns0#reservation_id pluck {
        id : $.ns0#reservation_id ,
        StartTime: $.ns0#reservation_start_dt,
        Schedule : {
            ReservationStartDate : $.ns0#reservation_start_dt,
            PreEventDate : $.ns0#pre_event_dt,
            EventStartDate : $.ns0#event_start_dt,
            PostEventDate : $.ns0#post_event_dt,
            ReservationEndDate : $.ns0#reservation_end_dt
        }   
    }

每当我尝试这段代码时，我都会收到错误：

＆＃34;执行时出现异常：预订：r map { ^ 无法将a：数组强制转换为：object。＆＃34;

当我尝试完全相同的代码但转换为JSON而不是XML时，转换工作完美。如果我删除了地图，代码可以工作，但它会加入同一标题下所有预订的所有ID。我不明白为什么Anypoint将xml解释为数组而不是对象。

Answer 1

首先需要注意的是，无论何时使用map进行迭代，都必须使用$访问当前元素数据并使用$$进行索引。这里r.ns0#reservation_id试图从：array强制转换为：object。尝试将代码更改为

%dw 1.0
%output text/xml
%namespace ns0 http://www.mynamespace.com/ns0
---
using (r = (flatten payload.ns0#reservations.*ns0#reservation))

Reservation: r map {
    id : $.ns0#reservation_id,
    StartTime: $.ns0#reservation_start_dt,
    Schedule : {
        ReservationStartDate : $.ns0#reservation_start_dt,
        ReservationEndDate : $.ns0#reservation_end_dt
    }   
}

还观察到输入XML的标签名称与代码中使用的名称不同。为了更具可读性，您可以将lambda与map一起使用

%dw 1.0
%output text/xml
%namespace ns0 http://www.mynamespace.com/ns0
---
using (r = (flatten payload.ns0#reservations.*ns0#reservation))

Reservation: r map ((reservation, reservationIndex) -> {
    id : reservation.ns0#reservation_id,
    StartTime: reservation.ns0#reservation_start_dt,
    Schedule : {
        ReservationStartDate : reservation.ns0#reservation_start_dt,
        ReservationEndDate : reservation.ns0#reservation_end_dt
    }   
})

希望这有帮助。

Dataweave XML-XML Transformation＆＃34;不能将a：数组强制转换为：string。＆＃34;

1 个答案: