diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/sqlalchemy/orm/session.py | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/sqlalchemy/orm/session.py b/lib/sqlalchemy/orm/session.py index 0b1a3b101..eccd60fe2 100644 --- a/lib/sqlalchemy/orm/session.py +++ b/lib/sqlalchemy/orm/session.py @@ -2110,6 +2110,13 @@ class Session(_SessionClassMethods): key = state.key if key is None: + if state in self._new: + util.warn( + "Instance %s is already pending in this Session yet is " + "being merged again; this is probably not what you want " + "to do" % state_str(state) + ) + if not load: raise sa_exc.InvalidRequestError( "merge() with load=False option does not support " |