How to configure Nested Loops?

Mitch Dale

Hey @Product,

Is there a way we can have nested loops now that we have the 'Update Data Library Item(s) to empty' WA? If memory serves me right, the crux of the issue with nested loops was always due to the 'Continue loop ID' and the 'Loop ID' data library variables having values initialized for them in the outer loop, and thus by the time the WF got to the nested inner loop, these values being pre-filled would throw off the inner loop

I'm wondering if it's possible to use the 'Update Data Library Item(s) to empty' WA along with Copy contents to facilitate nested loops?

Mitch Dale

Below is a basic Wrkflow I've put together to test nested loops:

https://account.wrk.com/designer/?client_id=5833&wrkflow_id=57958

Nick

Hey Mitch,

Really, the Update Data Library Item to empty Wrk Action is not a good fit for this. There are two components to make the nested loop work correctly.

You need a Copy Content at the beginning to capture the first Loop ID so it can be stored and used in the last Continue Loop Action.
You need Continue Loop ID to be blank in the nested "Loop through..." action. But only for the first time that it runs. You could try to use the Update to empty Wrk Action for this but you would need to know the internal key name of the field. Instead you can add a second nested "Loop Through..." Action that has a empty value for "Continue Loop ID"

You can see this in this Wrkflow: https://account.wrk.com/designer/?wrkflow_id=57961&client_id=484
The explanation of how to do this is also in this document (The video is currently more clear than the text, working on this) https://support.account.wrk.com/en/articles/13199161-loop-training

Mitch Dale

Thanks @Nick,

Yes you're right, the 'Update Data Library Item(s) to empty' doesn't seem to work.

I ended up getting it to work, which aligns exactly with what you wrote in your comment:

https://account.wrk.com/designer/?client_id=5833&wrkflow_id=57967