Arcade or Python? To populate attribute table with a dynamic url

Question

We have a hosted feature class and would like to create a dynamic URL by concatenating a base URL with a field value, and then store the resulting URL in the attribute table.

I have successfully created the dynamic URL for the pop-up, and I have also used Python to generate the URL in a test copy of the data stored locally. Ideally, we would like this field to be populated automatically when a new feature is created and saved using the instant app/field map.

I am unsure of the best approach. One option could be to use an ArcGIS Notebook with Python, but my understanding is that this would need to be scheduled rather than run automatically when a feature is saved, which would not meet our requirements for downstream processing. Alternatively, is it possible to achieve this using Arcade or another method that updates the field at the point of feature creation?

LTS_DSolari · Accepted Answer

Easiest Arcade expression you'll ever write:

"https://www.mywesite.com/path/to/root/" + $feature.my_field

You might need some more code to handle null values, other validity checks etc. but it's very easy and much better than waiting for an ETL process to run.