Fixed bug whereby ORM would run the wrong kind of

query when refreshing an inheritance-mapped class
where the superclass was mapped to a non-Table
object, like a custom join() or a select(),
running a query that assumed a hierarchy that's
mapped to individual Table-per-class.
[ticket:2697]

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/sqlalchemy/orm/mapper.py b/lib/sqlalchemy/orm/mapper.py
index d258a20b6..914c29b7f 100644
--- a/lib/sqlalchemy/orm/mapper.py
+++ b/lib/sqlalchemy/orm/mapper.py
@@ -1933,6 +1933,8 @@ class Mapper(_InspectionAttr):
             for mapper in reversed(list(self.iterate_to_root())):
                 if mapper.local_table in tables:
                     start = True
+                elif not isinstance(mapper.local_table, expression.TableClause):
+                    return None
                 if start and not mapper.single:
                     allconds.append(visitors.cloned_traverse(
                                                 mapper.inherit_condition,