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如何将数组分配给字符串？我想将 XML 转换为 CSV。我的数据编织返回数组。我想将其转换为 CSV。

转换消息代码：

%input payload application/xml
%output application/java
---
(payload.catalog.*category-assignment default []) groupBy $.@product-id pluck {

        product-id:$$,
        cat-id: $.@category-id joinBy ":",
        primary-flag:$.primary-flag,
        field3:$.@category-id when $.primary-flag[0] == "true"  otherwise ""

    }

我的有效载荷是这样的：

[{
    product - id = D198561, cat - id = 1111, primary - flag = null, field3 =
}, {
    product - id = D198563, cat - id = 30033, primary - flag = [true], field3 = [30033]
}, {
    product - id = D198566, cat - id = 0933: 2104: 7043, primary - flag = null, field3 =
}]

我希望关于有效负载的 CSV 输出为：

Field1: product-id, Field2:cat-id,Field3:field3

它在字段 3 中给出错误，因为它是像 field3=[30033] 这样的数组。
提前致谢

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