如何在 mule 4 中转置 csv？

Question

我有这样的 csv 负载

id,header,value
1,addr1,hyd
1,addr2,blr
2,addr1,rpr
2,addr2,knk
2,addr3,jpn

要求是将输出负载转换成这个

id,addr1,addr2,addr3
1,hyd,blr,
2,rpr,knk,jpn

我尝试了几种涉及 groupBy 的方法，但无法获得所需的输出。这就是我的 groupBy payload groupBy (item) -> item.id

有人可以帮帮我吗？提前致谢。

Answer 1

%dw 2.0
output application/csv
// Get the distinct headers, maybe you want them ordered too
var headers = "id" >> (payload.*header distinctBy $ orderBy $)
// Get the rows but organize them so that you have objects {header: value}
var rows = payload groupBy $.id 
mapObject (
    {($$): 
        $ reduce (e, acc={id: $$}) -> acc ++ {(e.header): e.value}
    }
) 
pluck $
---
// Iterate over the rows
rows map (
    // Iterate over the headers and add the values
    headers reduce (e, acc={}) -> acc ++ {(e): $[e]}
)

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