update

Author: tomkralidis

pycsw/core/repository.py

@@ -462,7 +462,10 @@ def query(self, constraint=None, sortby=None, typenames=None,
         if sortby is not None:  # apply sorting
             LOGGER.debug('sorting detected')
             # TODO: Check here for dbtype so to extract wkt from postgis native to wkt
-            sortby_column = self.query_mappings.get(sortby['propertyname'])
+            if self.database is not None:
+                sortby_column = getattr(self.dataset, sortby['propertyname'])
+            else:
+                sortby_column = self.query_mappings.get(sortby['propertyname'])
 
             if sortby['order'] == 'DESC':  # descending sort
                 if 'spatial' in sortby and sortby['spatial']:  # spatial sort