Hi everyone!
I'm trying to port my application from SA 0.5.8 to 0.6.5, and I'm
having a problem with __mapper_args__.. :/
The application uses the declarative plugin, and every class derives
from a customized declarative base that aims to add to each one the
"version_id_col".
Right now the code is like this:
class MyMeta(DeclarativeMeta):
def __init__(cls, classname, bases, dict_):
cls.version = Column(Integer)
cls.__mapper_args__ = { "version_id_col" : cls.version }
return DeclarativeMeta.__init__(cls, classname, bases, dict_)
Base = declarative_base(metaclass=MyMeta)
class Entity(Base):
__tablename__ = "entities"
....whatever...
but I think I'm missing something, since even a simple
print Entity().__mapper__.version_id_col
produces a "(no name)" instead of something like "entities.version",
so I'm guessing that some part of SA doesn't "see" the
version_id_col...?
I understand that SA 0.6 includes a "Declarative Mixin" feature, but
that would require to touch-up every class declaration to include the
mixin, am I right? It'd be no big deal, but I'd prefer to keep that
"complexity" away, if it's possible... :)
So my question is: since it was possible with SA 0.5, is there a way
to specify a version_id_col in a custom DeclarativeMeta using 0.6?
Many thanks for your attention!
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