How do you use an OpenAPI Array field in a REST flow action?

[BurtCrepeault]

Hi all,

I have an OpenAPI swagger loaded in ServiceNow, and some of the field definitions look like this:

{
     "fAllowEmptyValue": false,
     "fAllowReserved": false,
     "fContents": [
          {
               "fSchema": {
                    "fDeprecated": false,
                    "fEnum": [],
                    "fExclusiveMaximum": false,
                    "fExclusiveMinimum": false,
                    "fGlideType": "object",
                    "fName": "id0988831599",
                    "fNullable": false,
                    "fOneOf": [],
                    "fProperties": [
                         {
                              "fDeprecated": false,
                              "fEnum": [],
                              "fExclusiveMaximum": false,
                              "fExclusiveMinimum": false,
                              "fFormat": "int32",
                              "fGlideType": "integer",
                              "fName": "id0988831599",
                              "fNullable": false,
                              "fOneOf": [],
                              "fProperties": [],
                              "fReadOnly": false,
                              "fRequired": [],
                              "fType": "integer",
                              "fUniqueItems": false,
                              "fWriteOnly": false
                         }
                    ],
                    "fReadOnly": false,
                    "fRequired": [],
                    "fType": "array",
                    "fUniqueItems": false,
                    "fWriteOnly": false
               }
          }
     ],
     "fDeprecated": false,
     "fExplode": true,
     "fName": "id",
     "fParameterType": "query",
     "fRequired": false,
     "fStyle": "form"
}

This id field has fContent.fSchema.fType = "array", elements of which are fFormat: "Int32" and fGlideType: "integer".

When using this spec in a REST step of a Flow Action, I'm fumbling the ball as to how the query parameters should be created.

So I'm scripting the ID query parameter, and according to this product's documentation, the end result should look like this:

https://path/to/api/?id=6&id=8&id=7&id=9

My Flow Action receives a string of IDs, comma separated, and I've tried these mothods so far :

// Method 1
const stringIds = fd_data.action_inputs.ids.split(',');
const intIds = stringIds.map(str => parseInt(str, 10));
return intIds;
  // URL from HTTP logs:
  // https://path/to/api/?id=%5B%226.0%22%2C%227.0%22%2C%228.0%22%2C%229.0%22%5D

// Method 2
const stringIds = fd_data.action_inputs.ids.split(',');
var response = '';
for (var i=0; i<stringIds.length; i++) {
    response += i == 0 ? parseInt(stringIds[i]) : "&id=" + parseInt(stringIds[i]);
}
return response;
  // URL: https://path/to/api/?id=6%26id%3D7%26id%3D8%26id%3D9
  // close, but & and = characters are substituted, so id = the whole string

And of course, all I'm getting back from this server is:

Response code: 400
Response message: {"id":["Enter a whole number."]}

It's late, maybe I'll figure this out in my sleep, but if anyone has some insights on the issue, I'd be much obliged.