Hi I have a dataweave question, I have the sample input and I want to remove the 2nd object in the 2nd array. In short, records should be unique globally. I tried distinct and filter, however filter remove both, distinct doesn't change anything.
Input
[
{
"id": 1,
"books": [
{
"bookid": "1234",
"title": "C#"
},
{
"bookid": "5678",
"title": "Java"
}
]
},
{
"id": 2,
"books": [
{
"bookid": "4321",
"title": "VB"
},
{
"bookid": "5678",
"title": "Java"
}
]
}
]
Output
[
{
"id": 1,
"books": [
{
"bookid": "1234",
"title": "C#"
},
{
"bookid": "5678",
"title": "Java"
}
]
},
{
"id": 2,
"books": [
{
"bookid": "4321",
"title": "VB"
}
]
}
]
I made an assumption that we would be picking the first unique title and discard the remaining. Below I broke down your problem into 4 steps. First, I am adding id
with the books
, then remove duplicates using distinctBy
, then group filtered list by id
and finally, write your desired output. I am curious to see other solutions :)
%dw 2.0
output application/json
var globalList = payload flatMap ((item) -> (
item.books map (b) -> {id: item.id,(b)}))
distinctBy ((item) -> item.bookid)
groupBy ((item) -> item.id)
---
keysOf(globalList) map ((item) ->
{
id: item,
books: globalList[item] map ((book) -> book - 'id')
} )