How to Set an Array type variable

Question

Hello All,
Below is our ADF flow:

I have 3 parallel activities whose error message I need to capture (in case if any) and save it in an Array type variable.

For now I have made activity output as On Completion and with a string type variable concatenated the below value as 1 common string :
@markus.bohland@hotmail.de (activity('1').error?.message,activity('2').error?.message,activity('3').error?.message)

But the requirement is to save each error message as a seperate array element within a variable of type Array.

Any help would be appreciated.

And also is it possible to to append the activity name with the errormsg?

Answer 1

Hello again @Nandan Hegde .

In this case, you should be using, Append Variable not Set Variable. An Append Variable after each activity like below image

Each Append Variable activity can be used to create a "message". Below is code to make a JSON format message for hypothetical activity named "DoThing". First it checks whether the activity succeeded or not. Then it makes message differently for success and fail. For success there is no error message to get. There may be an error message for failure. The .? makes it null-safe. Each Append Variable activity will need its code tweaked to reflect the activity it is reporting on.

@if(equals(activity('DoThing').Status,'Succeeded'),  
  
'{"Name":"DoThing" , "status":"Success", "error":"N/A"}',  
  
concat('{"Name":"DoThing", "Status":"Fail","error":',  
string(activity('DoThing')?.Error))  
  
)  
  
=>  
  
{"Name":"LookupNull", "status": success or fail , "error": N/A or error message}  

Answer 2

Hey @MartinJaffer-MSFT ,
Thank you for your inputs :)
But in my scenario, all the activities are running parallelly and there in order to reduce the number of activities iin pipeline , I tried using 1 set variable activity.
I was able to achieve it by using Split function on the below appended string :
@markus.bohland@hotmail.de (activity('1').error?.message,activity('2').error?.message,activity('3').error?.message) to achieve my results.
But is there a way possible to use only 1 append variable activity for all activity outputs during parallel processing ?