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Mike Bayer
428ea01f00
Modified the :class:`.DeclarativeMeta` metaclass to pass ``cls.__dict__`` into the declarative scanning process to look for attributes, rather than the separate dictionary passed to the type's ``__init__()`` method. This allows user-defined base classes that add attributes within an ``__init_subclass__()`` to work as expected, as ``__init_subclass__()`` can only affect the ``cls.__dict__`` itself and not the other dictionary. This is technically a regression from 1.3 where ``__dict__`` was being used. Additionally makes the reference between ClassManager and the declarative configuration object a weak reference, so that it can be discarded after mappers are set up. Fixes: #7900 Change-Id: I3c2fd4e227cc1891aa4bb3d7d5b43d5686f9f27c
