Referencing a Record List in an Interface (20.3)

Question

We are having an issue with the Record List in an Interface (20.3) trying to reference the data from the grid. 
 Apologies to start with, very new to Appian! Only a couple of months! 
 Just created an Interface with the Record List included as a Grid (new in 20.3) the grid appears well and very happy with it. However, on a button click, I am trying to save the bookingid's into a local variable using;

I have tried lots of different options here and get either a mistype (record type to text) or simply bizarre entries as " bookingid " (as in example) 
 So, how do you reference a Record List in an Interface out of the Grid? Is it possible or do we have to create the read only grid from scratch? Any pointers appreciated! 
 Thanks

Mike Schmitt · Answer

Not sure I understand - are you trying to save all booking IDs to the local variable upon button click? What happens if you replace line 94 with " fv!item "? That's the normal usage of a!forEach() .

Mike Schmitt · Answer

So, while the read-only grid has been updated to allow a record type to be set as its data source, you're trying to directly reference a record type field outside of that - and as far as I know, this is not supported functionality. You'll probably have to query the desired IDs via a query rule within the button saveInto.

Mike Schmitt · Answer

I know it might be slightly more of a pain, but it probably won't be too hard to set up a Query Entity (or Query RecordType if your record type is not expression-backed) to mimic both the default filtering on the record type as well as any on-form filtering done by a user. Though suddenly I'm curious whether we have on-form access to the "official" record type filters when using the OOB record type as a grid data source.... I haven't had a chance to really dig into this yet.