Mutate Transform Data Ressource

[Eric54]

In UI builder I've created a new mutate transform data source.   It contains four properties.  But when I execute the instance of my data source the input is always an empty object {}.  I added the first line to help me debug and I can see the application log that input is an empty {}. Anyone have any ideas?

Here are my properties:

[
  {
    "name": "visitTitle",
    "label": "Visit Title",
    "readOnly": false,
    "fieldType": "string",
    "mandatory": true,
    "defaultValue": ""
  },
  {
    "defaultValue": "{\"id\":\"1b90eb8e1b5afc1078230d47dc4bcbc3\",\"label\":\"Smith, John\"}",
    "description": "A sponsor item",
    "fieldType": "json",
    "label": "Visit Sponsor",
    "name": "visitSponsor",
    "readOnly": false,
    "required": true,
    "typeMetadata": {
      "schema": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string"
          },
          "label": {
            "type": "string"
          }
        },
        "required": ["id", "label"]
      }
    }
  },
  {
    "defaultValue": "[{\"id\":\"1b90eb8e1b5afc1078230d47dc4bcbc3\",\"label\":\"0109\"}]",
    "description": "An array of Rooms",
    "fieldType": "json",
    "label": "Visit Rooms",
    "name": "visitRooms",
    "readOnly": false,
    "required": true,
    "typeMetadata": {
      "schema": {
        "type": "array",
        "items": {
          "type": "object",
          "properties": {
            "id": {
              "type": "string"
            },
            "label": {
              "type": "string"
            }
          },
          "required": ["id", "label"]
        }
      }
    }
  },
  {
    "description": "The visit type stored in the visit record.",
    "fieldType": "choice",
    "label": "Visit Type",
    "name": "visitType",
    "readOnly": false,
    "required": true,
    "typeMetadata": {
      "choices": [
        {
          "label": "Visitor",
          "value": "v"
        },
        {
          "label": "Gallery",
          "value": "g"
        },
        {
          "label": "Tour",
          "value": "t"
        }
      ],
      "schema": {
        "type": "string",
        "enum": ["v", "g", "t"]
      }
    }
  }
]
​

This is some simplified code from the data resource:

function transform(input) {
    gs.info(JSON.stringify(input, null, 3));
    var output = {
        isSuccess: false
    };

    try {
        var visit_title = input.visitTitle;
        var visit_sponsor = input.visitSponsor;
        var visit_rooms = input.visitRooms;
        var visit_type = input.visitType;

        var first_location = "";
        var buildingId = "";
        var locations = [];

        for (var i = 0; i < visit_rooms.length; i++) {
            var room = visit_rooms[i];
            if (i === 0) {
                first_location = room.id;
            }
            locations.push(room.id);
        }

        // Get first room
        var fr = new GlideRecord('sn_wsd_core_room');
        if (fr.get(first_location)) {
            buildingId = fr.getValue("building");
        } else {
            throw new Error("Could not load the selected room.");
        }

        // Create Event sn_wsd_case_workplace_case
        var c = new GlideRecord('sn_wsd_case_workplace_case');
        c.initialize();
        ... <Setting my case properties> ...

        var caseId = c.insert();

        // Create Visit sn_wsd_visitor_visit
        var v = new GlideRecord('sn_wsd_visitor_visit');
        v.initialize();
        ... <Setting my visit properties> ...

        // Set output
        output.isSuccess = true;
        output.caseId = caseId;
        output.visitId = visitId;
    } catch (ex) {
        output.message = ex.message;
    }
    return output;
}

This is how I execute my DR:

    api.data.vms_create_event.execute({
        visitTitle: api.state.visit_title,
        visitSponsor: api.state.visit_sponsor,
        visitRooms: api.state.visit_rooms,
        visitType: api.state.visit_type
    });

I did verify my state is variables and they are OK.

[Dibyaratnam · Accepted solution]

Simplify the properties and to debug the input value, reduce the fields in the properties and keep debugging until you find the particular property causing the issue.

[Eric54]

Looks like the properties were the culprit.   It did not like 

"required": true,

[Eric54]

Looks like the problem was in my json properties.  I needed to add "valueType": "object" and

I also removed "required": true.