Process Model Error reporting via API

Can you validate that the user exists when its a deactivation request ? checking the user id exists in the API before calling the deactivate step would give you confidence that the request is valid. 

Yes we can but the response "valid" , "invalid" or any error needs to be reported back as an API response

Yes we can but the response "valid" , "invalid" or any error needs to be reported back as an API response

Are you using a WebAPI to do this activity ? If you are then you can programmatic control the HTTP response and messages going back to the consumer based on the outcome of the validation step.

Yes i am using WEB API to do this activity and my error response is

onError: a!httpResponse(
statusCode: 500,
headers: {
a!httpHeader(name: "Content-Type", value: "application/json"),
},
body: a!toJson(
{
fv!processInfo.pv,

"status"  

But this does not report the error back but an empty string

pv": {
"deactivateResponse": "",
"deactivateUser": [

Am i missing something?

The alert you are getting is from the Appian Smart Service in Process - so the process model has generated the alert and presumably the process model instance has now stopped. Presumably the PV's are not filled due to this alert. By validating the userid in the WebAPI you can send the invalid response back to the consumer before calling the process model to deactivate / update users based on the validation you've done in the webAPI. I'll try to knock up some sample code that might help

with(
  
  local!fromJson: a!fromJson(http!request.body),
   
  /*Validate the request details*/
  local!validate: /* RESULT OF THE USER VALIDATION*/ 
				  /* one option could be to call isusernametaken() passing in the input user id */
				  /* if this returns false then you can programatically pass back an error */ 
				  /* you'd want to try and make sure that the user id exists in Appian and is valid for the update user smart service to work in process */
  ,
  
  /*Start Process if all ok or respond with validation error*/
  local!result: if (local!validate,
  
	/*REQUEST VALID*/
	/* Logic that starts the Process - passing back the result */
	
	a!startProcess(
		processModel: /* Your user update model */, 
		processParameters /* Input params */, 
		onSuccess: 
			a!httpResponse_17r4(
				statusCode : 200,
				headers: {
					a!httpHeader(name: "Content-Type", value: "application/json"),
					a!httpHeader(name: "Correlation-ID", value: tostring(index(http!request.headers, "Correlation-ID", null())))
				},
				body: a!toJson(
					{
						fv!processInfo.pv, /*Plus other data items as required*/
					}	
				
		, 
		onError: 
			a!httpResponse_17r4(
				statusCode: 400,
				headers: {
					a!httpHeader(name: "Content-Type", value: "application/json"),
					a!httpHeader(name: "Correlation-ID", value: tostring(index(http!request.headers, "Correlation-ID", null())))
				},
				body: a!toJson_17r1(
			{
				resource: index(http!request, "url", null()),
				httpStatusCode: 400,
				message: "There was an error starting the process", /*or something similar */
				title: "Error Starting Process"         /*or something similar*/    
			}
			)
		)
	),
	
	/*ELSE - invalid request as the user doesnt exist */
	a!httpResponse_17r4(
				statusCode: 400,
				headers: {
					a!httpHeader(name: "Content-Type", value: "application/json"),
					a!httpHeader(name: "Correlation-ID", value: tostring(index(http!request.headers, "Correlation-ID", null())))
				},
				body: a!toJson_17r1(
			{
				resource: index(http!request, "url", null()),
				httpStatusCode: 404,
				message: "The requested user id is not valid", /*or something similar */
				title: "Invalid User Id"         /*or something similar*/    
			}
			)
		),
	
	
   
  local!result
)

Hope the above helps - I think you want to try and trap that the user is valid before trying any smart service updates on that user id. **EDIT - the code has been copied and cribbed from something we do for write to data store so is probably missing commas or closing brackets - and obviously needs bringing up to current appian function versions **

paulc919 will give this a try

paulc919 Your pointers did help and we are able to get the error and success response in the API  body but  when getting all groups and users the json is converted in to string format is there a way to get the output in json

What we are currently getting is 

getAllGroups": [
"groupName: ACO Administrators",
"description: ",
"groupName: ACO All Users",
"description: ",
"groupName: Application Users",
"description: Members of this group will be able to use applications exposed through the applications portal, but do not have permission to use the designer interface.",

What we are looking for is something in the below format

getAllGroups": [
{
"groupName: ACO Administrators",
"description: ",
}
{
"groupName: ACO All Users",
"description: ",
}
{
"groupName: Application Users",
"description: Members of this group will be able to use applications exposed through the applications portal, but do not have permission to use the designer interface.",
}

have you tried looking at the a!toJson function ? If your response from the process model is an array of CDT then I think a cast might be what you are looking for... possibly ... I will admit I have not had too much experience with json strings. 

Yes we are using a!toJson function