Yes, that’s what I understood.
That wont work - as I guess you’ve discovered - because you can’t take a joined list of a computed column from a Big Table.
However, there is a workaround - and this is something that I have used, so I know it will work.
- Start by creating a Query, matching the SupplierID of the one you want to update.
- Take a Joined List of RowID’s through the Query (this will work, because it’s a non-computed column)
- Feed the Joined List into a JavaScript column that processes the list of RowIDs, and outputs a JSON collection of API mutations, each of which updates your Text column with the new name
- Use the JavaScript column in a Call API action
As I said, this works perfectly well. I’ve actually been using the technique to good effect just in the past few days. The only thing you need to watch out for is the upper limit (500) on mutations in a single API call. If you need to update more than 500 rows in one go, then you’ll need to batch them up.
oh, I should add - even using this technique, you’ll still be using an update for every mutation - so that part of it won’t change.