diff options
Diffstat (limited to 'lib/sqlalchemy/ext/automap.py')
| -rw-r--r-- | lib/sqlalchemy/ext/automap.py | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/sqlalchemy/ext/automap.py b/lib/sqlalchemy/ext/automap.py index 55ab325a3..5fa4e8822 100644 --- a/lib/sqlalchemy/ext/automap.py +++ b/lib/sqlalchemy/ext/automap.py @@ -517,6 +517,7 @@ from .declarative import declarative_base as _declarative_base from .declarative.base import _DeferredMapperConfig from .. import util from ..orm import backref +from ..orm import exc as orm_exc from ..orm import interfaces from ..orm import relationship from ..orm.mapper import _CONFIGURE_MUTEX @@ -841,6 +842,16 @@ class AutomapBase(object): """ + @classmethod + def _sa_raise_deferred_config(cls): + raise orm_exc.UnmappedClassError( + cls, + msg="Class %s is a subclass of AutomapBase. " + "Mappings are not produced until the .prepare() " + "method is called on the class hierarchy." + % orm_exc._safe_cls_name(cls), + ) + def automap_base(declarative_base=None, **kw): r"""Produce a declarative automap base. |