Flow Designer: How to Loop through a Comma-Separated String

[jmiskey]

I have a Flow that has a Flow Variable whose value is being dynamically built.  Basically, it is building a list of AD Groups to add someone to, based on the answers to a bunch of questions in the Catalog Item.  So when it is complete, it is a String that is structured like this:

AD_Group_1,AD_Group_2,AD_Group_3

I now would like to run a "For Each" action on it, to loop through each of those 3 values.  However, a "For Each" does not want to run against a "String" variable, and you cannot create Flow Variables with an "Array" type. 

So, unless I am missing something, I assume that I somehow need to convert my String into an Array (maybe via a Custom Action)?  What is the easiest way of doing that?  Has anyone come up with the code for that already?  Or is there a different way I can loop through those values in my comma-separated string in Flow Designer?

Thanks

[Zach Koch · Accepted solution]

Take a look at this post, it should help you solve your issue.

Action Designer - Custom action to convert comma separated strings into array 

[jmiskey]

That looks promising, but the only issue is that it shows the output as a "String" variable.  I tested it out, and the "For Each" action in ServiceNow does not allow you to use a String variable on it.  I tried changing it to "Array.String" output type, but is not working either.

Any idea on what I need to tweak to get this to work in a "For Each" action?

[Zach Koch]

Can you share the way you have your action configured? You can use Array.string as an output, and use for each on that.

[jmiskey]

I had to update the Output types to "Array.String" in BOTH the Script section AND the Output section.  When I did that, it all worked out.

Thanks!