allows strings as select args, thanks dhx

VERSION

@@ -1 +1 @@
-Version 2.00.0 (2012-08-08 22:33:45) dev
+Version 2.00.0 (2012-08-09 08:57:54) dev

gluon/dal.py

@@ -1312,6 +1312,12 @@ class BaseAdapter(ConnectionPool):
         for item in fields:
             if isinstance(item,SQLALL):
                 new_fields += item._table
+            elif isinstance(item,str):
+                if regex_table_field.match(item):
+                    tablename,fieldname = item.split('.')
+                    new_fields.append(self.db[tablename][fieldname])
+                else:
+                    new_fields.append(Expression(self.db,item))
             else:
                 new_fields.append(item)
         # ## if no fields specified take them all from the requested tables