[openstack-dev] [Solum] Some initial code copying for db/migration

Clayton Coleman ccoleman at redhat.com
Fri Nov 1 23:06:27 UTC 2013

----- Original Message -----
> >   https://github.com/openstack/nova/blob/master/nova/db/sqlalchemy/api.py#L420
> >   https://github.com/openstack/nova/blob/master/nova/db/sqlalchemy/models.py#L43
> This API and these models are what we are trying to avoid exposing to
> the rest of nova. By wrapping these in our NovaObject-based structures,
> we can bundle versioned data and methods together which is what we need
> for cross-version compatibility and parity for the parts of nova that
> are not allowed to talk to the database directly.
> See the code in nova/objects/* for the implementations. Right now, these
> just call into the db_api.py, but eventually we want to move the actual
> database implementation into the objects themselves and hopefully
> dispense with most or all of the sqlalchemy/* stuff. This also provides
> us the ability to use other persistence backends that aren't supported
> by sqlalchemy, or that don't behave like it does.
> If you're going to be at the summit, come to the "objects" session on
> Thursday where we'll talk about this in more detail. Other projects have
> expressed interest in moving the core framework into Oslo so that we're
> all doing things in roughly the same way. It would be good to get you
> started on "the right way" early on before you have the migration hassle
> we're currently "enjoying" in Nova :)

Good idea, I'll dig through the code on the plane :) 

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