[Active4d-dev] Problem with Sets

[David Wright]

Hi all,
I'm having a little problem...
Using 4D Server v.2003, A4D 3.0 using 4D web server via WebSTAR V, I  
have a page with the following code:

<%	create empty set([Airports];"useairports")
	 
QUERY([AircraftAirportLink];[AircraftAirportLink]PublicationRecordNumber 
=num($recnum))
	for ($i;1;records in selection([AircraftAirportLink]))
	 
query([Airports];[Airports]RecordNumber=[AircraftAirportLink]AirportReco 
rdNumber)
	add to set([Airports];"useairports")
	next record([AircraftAirportLink])
	end for %>
	
<%	=records in set("useairports") %>

<%   use set("useairports") %>
<%   =records in set("useairports") %>
<%   =records in selection([Airports]) %>
        
<%   for ($j;1;records in selection([Airports]))
        goto selected record([Airports];$j)
        etc etc
What I find is that "records in set("useairports")" is quite correctly  
calculated, and displays correctly both times it is called up on the  
page. However, "records in selection([Airports])" stays stubbornly at  
zero, despite the "use set" instruction.

If I put this into a 4D method it all works fine, so I'm stumped. I  
checked the A4D docs but can't see many references to the use of Sets,  
so have assumed that the syntax I'm using is allowable.

I bet it's something really obvious to someone less stupid.
David Wright
Stansted News Limited
134 South Street, Bishop's Stortford, Herts CM23 3BQ, UK
Tel: 01279 714500