Stunner is not reading all parameters in WID and exposing them as DataInput Assignments.
Examples are the built-in Rest WID and EMAIL WID, which does not have all the parameters declared in WID exposed in stunner due to this bug.
Below an old requirement to enhance Rest WID, when runtime team investigated the issue to implement it was noticed that actually all parameters was there, so the issue is actually in the editor side.
Feedback from Andy Yuen:
The Rest service task's default 7 input parameters are not sufficient to call a non-trivial Rest service:
"name" : "Rest",
"parameters" : [
"ContentData" : new StringDataType(),
"Url" : new StringDataType(),
"Method" : new StringDataType(),
"ConnectTimeout" : new StringDataType(),
"ReadTimeout" : new StringDataType(),
"Username" : new StringDataType(),
"Password" : new StringDataType()
"results" : [
"Result" : new ObjectDataType(),
"displayName" : "REST",
"icon" : "defaultservicenodeicon.png"
In my opinion, to provide something usable out-ot-the-box, it requires at least 2 more parameters:
The first one is used to specify "application/json", without it, the handler will fail to transform the ContentData object
The 2nd one is needed to return a non-trivial result by specifying its fully qualified class name. Without this parameter, the handler will not be able to "transform" the result into the kind of object targeted.
This is a simple thing to do, I am baffled why the default "WorkitemDefinitions" did not include these 2 parameters leaving the user wondering why his Rest call is not working and spending considerable time trying to resolve it.