- added 'passive_deletes="all"' flag to relation(), disables all

  nulling-out of foreign key attributes during a flush where the parent
  object is deleted.

- fix to FK compile fix from yesterday

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/sqlalchemy/schema.py b/lib/sqlalchemy/schema.py
index 212fdac82..3b7f08f79 100644
--- a/lib/sqlalchemy/schema.py
+++ b/lib/sqlalchemy/schema.py
@@ -509,6 +509,8 @@ class Column(SchemaItem, expression._ColumnClause):
         if not self._is_oid:
             self._pre_existing_column = table._columns.get(self.key)
             table._columns.add(self)
+        else:
+            self._pre_existing_column = None
         if self.primary_key:
             table.primary_key.add(self)
         elif self.key in table.primary_key:
@@ -555,6 +557,7 @@ class Column(SchemaItem, expression._ColumnClause):
         c.orig_set = self.orig_set
         c.__originating_column = self.__originating_column
         c._distance = self._distance + 1
+        c._pre_existing_column = self._pre_existing_column
         if not c._is_oid:
             selectable.columns.add(c)
             if self.primary_key: