I'm learning to work with the datanav.
I'm modifying one of the CRUDs created by the AppWizard. My file has a
foreign key that I wish the user to see as a drop down list, so I change
the input control to a dDropdownList with ValueMode='Key'. I would
usually set right there the Choices and Keys, and get done with it. But
this control must be different, if a value has already been referenced
by a foreign key in some other row of the actual table it must not
appear in the drop down, unless it is the value that is being referenced
in the actual row.
To make it easier to understand, the Choices and Keys of the drop down
list must come from the following :
crs.execute("""select Id, trim(Nombre||" "||Apellido) as
FullName
from persona
where Id not in (select PersonaId
from proveedor)
or Id = ?
order by FullName""",
(self.Record.Id , ))
where self.Record.Id is the actual row.
I have everything set and working but I am not being able to place
Choices and Keys assignment in a proper place. I've tried binding the
RowNumChanged event to the method that sets the Choices and Keys, but
this event occurs AFTER the controls are updated, so when I move the
pointer I get a value error when the framework tries to set the drop
down's Value to a foreign key that does not exist the actual choices
(the choices appropriate for the previous record).
I've also tried binding the drop down's Update event to this method with
the same results.
Has anybody done something similar? Any suggestions?
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