diff options
Diffstat (limited to 'lib/sqlalchemy/ext/declarative.py')
| -rwxr-xr-x | lib/sqlalchemy/ext/declarative.py | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/sqlalchemy/ext/declarative.py b/lib/sqlalchemy/ext/declarative.py index 23346730f..651a94970 100755 --- a/lib/sqlalchemy/ext/declarative.py +++ b/lib/sqlalchemy/ext/declarative.py @@ -1036,7 +1036,7 @@ from sqlalchemy import util, exc from sqlalchemy.sql import util as sql_util, expression from sqlalchemy import event from sqlalchemy.orm.util import polymorphic_union, _mapper_or_none - +import weakref __all__ = 'declarative_base', 'synonym_for', \ 'comparable_using', 'instrument_declarative' @@ -1718,7 +1718,7 @@ def declarative_base(bind=None, metadata=None, mapper=None, cls=object, lcl_metadata.bind = bind if class_registry is None: - class_registry = {} + class_registry = weakref.WeakValueDictionary() bases = not isinstance(cls, tuple) and (cls,) or cls class_dict = dict(_decl_class_registry=class_registry, |