// Ick, duplicated from DatabaseTrackListModel
public override string GetSqlFilter()
{
string filter = null;
// If the only item is the "All" item, then we shouldn't allow any matches, so insert an always-false condition
if (HasSelectAllItem && Count == 1)
{
return("0=1");
}
else
{
ModelHelper.BuildIdFilter <object> (GetSelectedObjects(), FilterColumn, null,
delegate(object item) {
if (!select_all_item.Equals(item))
{
return(ItemToFilterValue(item));
}
return(null);
},
delegate(string new_filter) { filter = new_filter; }
);
}
return(filter);
}
