- [feature] New standalone function with_polymorphic()

provides the functionality of query.with_polymorphic()
in a standalone form.   It can be applied to any
entity within a query, including as the target
of a join in place of the "of_type()" modifier.
[ticket:2333]
- redo a large portion of the inheritance docs in terms
of declarative, new with_polymorphic() function
- upgrade examples/inheritance/polymorph, rename to "joined"

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/sqlalchemy/orm/mapper.py b/lib/sqlalchemy/orm/mapper.py
index 0771bbf3d..795447763 100644
--- a/lib/sqlalchemy/orm/mapper.py
+++ b/lib/sqlalchemy/orm/mapper.py
@@ -1358,7 +1358,8 @@ class Mapper(object):
                 spec = self.with_polymorphic[0]
             if selectable is False:
                 selectable = self.with_polymorphic[1]
-
+        elif selectable is False:
+            selectable = None
         mappers = self._mappers_from_spec(spec, selectable)
         if selectable is not None:
             return mappers, selectable