See 
http://docs.sqlalchemy.org/en/latest/orm/mapper_config.html#constructors-and-object-initialization



On Mon, Jan 7, 2013 at 4:47 AM, RM <ryan.mckil...@gmail.com> wrote:
> I have a class which inherits from Base. My class has a metaclass which
> inherits from DeclarativeMeta. Among other things, the metaclass adds an
> __init__ method to the class dictionary. When I instantiate an instance of
> my class directly, my __init__ method is invoked, but if I use the ORM to
> retrieve an instance, my __init__ method is not invoked.
>
> A metaclass serves better than a mixin for what I am trying to accomplish.
> However, I did experiment with a mixin and saw the same behavior as
> described above.
>
> Any ideas? Many thanks.
>
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