jslt for loop capability

[brh]

How can I use the for loop to concat a string as opposed to making an array.
JSON:
{ "x": [ { "y": "y1" }, { "y": "y2" }, { "y": "y3" } ] }

Should turn into this
{
"arbitraryField":"y1,y2,y3"
}

[brh]

Oops, I found join, although I still am having trouble getting it to work.

[larsga]

What's the problem?

[brh]

Ok closer to the real world example.
`{
"cartId": "6795708823149918171",
"cartItems": [
{
"fulfillments": [
{
"fulfillmentType": "PARCEL",
},
{
"fulfillmentType": "PICKUP",
},
{
"fulfillmentType": "TRUCK",
}
],

"createdOn": "2021-05-05T15:09:14Z"
}`

Then I wrote a template like this:
{ "&&events": [for (.cartItems) string(.fulfillments.fulfillmentType)] }

The response I get is
{"&&events":["null"]}

So once I get the correct values of ["PARCEL","PICKUP","TRUCK"]
I want it to be
{"&&events":"xxx=PARCEL;xxx=PICKUP,xxx=TRUCK"}

[larsga]

Is there really an array inside cartItems? If so, you're not accounting for it.

If I were you I'd start out with real data and the playground, and write an expression there that gives ["PARCEL","PICKUP","TRUCK"] as the output, and only then try to put together the rest.

[brh]

Ok, but yes there can be multiple cartItems

[larsga]

Given this input:

{"cartId": "6795708823149918171",
"cartItems": [ {
  "fulfillments": [ {"fulfillmentType": "PARCEL"},
                    {"fulfillmentType": "PICKUP"},
                    {"fulfillmentType": "TRUCK"}]},
  {
  "fulfillments": [ {"fulfillmentType": "OTHER"}]}
],
"createdOn": "2021-05-05T15:09:14Z"
}

you can get the output you want with:

let tmp = flatten([for(.cartItems) .fulfillments])

{"&&events" : join([for ($tmp) "xxx=" + .fulfillmentType], ";")}

Having to use flatten and multiple for loops is not really ideal, so I think we do need to add an array traversal operator (already planned in issue #183).

[brh]

That did it thanks!!!