SQLAlchemy 0.8 support

flask_admin/contrib/sqlamodel/view.py

@@ -658,7 +658,14 @@ class ModelView(BaseModelView):
                             query = query.join(parts[0])
                             joins.add(parts[0])
                 elif isinstance(sort_field, InstrumentedAttribute):
-                    table = sort_field.parententity.tables[0]
+                    # SQLAlchemy 0.8+ uses 'parent' as a name
+                    mapper = getattr(sort_field, 'parent', None)
+                    if mapper is None:
+                        # SQLAlchemy 0.7.x uses parententity
+                        mapper = getattr(sort_field, 'parententity', None)
+
+                    if mapper is not None:
+                        table = mapper.tables[0]
 
                         if table.name not in joins:
                             query = query.join(table)