diff options
| -rw-r--r-- | lib/sqlalchemy/orm/mapper.py | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/mapper.py b/lib/sqlalchemy/orm/mapper.py index 316617835..fd23f5563 100644 --- a/lib/sqlalchemy/orm/mapper.py +++ b/lib/sqlalchemy/orm/mapper.py @@ -161,7 +161,9 @@ class Mapper(object): if isinstance(self.local_table, expression._SelectBaseMixin): util.warn("mapper %s creating an alias for the given " - "selectable - use Class attributes for queries." % self) + "selectable. References to the original selectable " + "may be misinterpreted by queries, polymorphic_on, etc. " + " Consider passing an explicit selectable.alias() construct instead." % self) self.local_table = self.local_table.alias() if self.with_polymorphic and isinstance(self.with_polymorphic[1], expression._SelectBaseMixin): |