How to implement group by in Dataweave based on first column in CSV - anypoint-studio

Question

I have an incoming CSV file that looks like this (notice that the first field is common - this is the order number)
36319602,100,12458,HARVEY NORMAN,
36319602,101,12459,HARVEY NORMAN,
36319602,102,12457,HARVEY NORMAN,
36319601,110,12458,HARVEY NORMAN,
36319601,111,12459,HARVEY NORMAN,
36319601,112,12457,HARVEY NORMAN,
36319603,110,12458,HARVEY NORMAN,
36319603,121,12459,HARVEY NORMAN,
36319603,132,12457,HARVEY NORMAN,
This is my current Dataweave code
list_of_orders: {
order: payload map ((payload01 , indexOfPayload01) -> {
order_dtl:
[{
seq_nbr: payload01[1],
route_nbr: payload01[2]
}],
order_hdr: {
ord_nbr: payload01[0],
company: payload01[3],
city: payload01[4],
}
})
}
An example of the desired output would be something like this ... (this is just mocked up). Notice how I would like a single header grouped by the first column which is the order number - but with multiple detail lines
"list_of_orders": {
"order": [
{
"order_dtl": [
{
seq_nbr: 100,
route_nbr: 12458
},
{
seq_nbr: 101,
route_nbr: 12459
},
{
seq_nbr: 102,
route_nbr: 12457
}
],
"order_hdr":
{
ord_nbr: 36319602,
company: HARVEY NORMAN
}
}
]
}
It works fine except that it is repeating the order_hdr key.
What they would like is a single header key with multiple details beneath.
The grouping is to be based on "ord_nbr: payload01[0]"
Any help appreciated
Thanks

Answer 1

I think you're using Dataweave 1. In dw1, this groupBy gets the desired output(Note you can change the field pointers [0],1 etc to field name mappings if you have them set up as metadata etc):
%dw 1.0
%output application/json
---
list_of_orders: {
order: (payload groupBy ($[0])) map {
order_dtl: $ map {
seq_nbr: $[1],
route_nbr: $[2]
},
order_hdr:
{
ord_nbr: $[0][0],
company: $[0][3]
}
}}
UPDATE
Here is the output for the new input sample with multiple orders:
{
"list_of_orders": {
"order": [
{
"order_dtl": [
{
"seq_nbr": "110",
"route_nbr": "12458"
},
{
"seq_nbr": "121",
"route_nbr": "12459"
},
{
"seq_nbr": "132",
"route_nbr": "12457"
}
],
"order_hdr": {
"ord_nbr": "36319603",
"company": "HARVEY NORMAN"
}
},
{
"order_dtl": [
{
"seq_nbr": "100",
"route_nbr": "12458"
},
{
"seq_nbr": "101",
"route_nbr": "12459"
},
{
"seq_nbr": "102",
"route_nbr": "12457"
}
],
"order_hdr": {
"ord_nbr": "36319602",
"company": "HARVEY NORMAN"
}
},
{
"order_dtl": [
{
"seq_nbr": "110",
"route_nbr": "12458"
},
{
"seq_nbr": "111",
"route_nbr": "12459"
},
{
"seq_nbr": "112",
"route_nbr": "12457"
}
],
"order_hdr": {
"ord_nbr": "36319601",
"company": "HARVEY NORMAN"
}
}
]
}
}