sqlite detects version and disables CAST if version < 3.2.3

fixes to unittests, mapper extension to work better with setting/unsetting extensions
objectstore objects get 'session' attribute

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/sqlalchemy/orm/mapper.py b/lib/sqlalchemy/orm/mapper.py
index 92d10ad10..beccb16af 100644
--- a/lib/sqlalchemy/orm/mapper.py
+++ b/lib/sqlalchemy/orm/mapper.py
@@ -201,6 +201,7 @@ class Mapper(object):
         self.extension = None
         previous = None
         for ext in extlist:
+            ext.unchain()
             if self.extension is None:
                 self.extension = ext
             if previous is not None:
@@ -1164,6 +1165,8 @@ class MapperExtension(object):
     def chain(self, ext):
         self.next = ext
         return self
+    def unchain(self):
+        self.next = None
     def get_session(self):
         """called to retrieve a contextual Session instance with which to
         register a new object. Note: this is not called if a session is