Hi team,

I’m getting bad request response with JSON API contract creation. Error message refers data type issue of DA.Set and JsonArray.

Appreciate your help.

DAML version - 1.16.0

DAML template

template LedgerTest
with
owner : Party
obs : Set Party
slotKey : Int
version: Int
timeStamp : Time
where
signatory owner
observer obs

Request Body

{

“templateId”: “5d448c13ba2ed7dea9c6b97a4abf690d6f78c605fac96bb098e60b6dbdbf81d3:Main:LedgerTest”,

“payload”: {

“owner”: “Alice”,

“obs”: ,

“slotKey”: 1,

“version”: 1,

“timestamp”: “2021-10-20T03:06:56.326Z”

},

“meta”: {

“commandId”: “f7a21b8c-982d-4ec7-89ac-9e27468e03cb”

}

Response

{

“errors”: [

“JsonError: spray.json.DeserializationException: Can’t read [] as DamlLfRecord 97b883cd8a2b7f49f90d5d39c981cf6e110cf1f1c64427a28a6d58ec88c43657:DA.Set.Types:Set, wrong number of record fields (expected 1, found 0).”

],

“status”: 400

}

Thanks,
Thejaswani

Hi @Theja, take a look at REST JSON Specification - #2 by cocreature which tackles the same topic.

To summarize, Set is a record wrapper around Map so you need something like {"map": []} for an empty Set instead of [].

Thank you @cocreature works now