[openstack-dev] Online Migrations.

Dan Smith dms at danplanet.com
Wed Jun 10 21:16:20 UTC 2015

> Well as long as you want to be able to load data and perform updates on
> Instance.name using normal ORM patterns, you'd still have that column
> mapped, if you want to put extra things into it to signal your migration
> tool, there is an .info dictionary available on the Column that you can
> use to do that.  A function like "removed_field()" can certainly wrap
> around a normal column mapping and populate a hint into the .info
> dictionary that online migrations will pick up on.

I intentionally didn't (try to) define RemovedField because I figured it
might contain some nasty proxy bits to make it continue to work.
However, glad to hear that there is already a provision here that we can
use -- that sounds perfect.


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