On Mon, Mar 21, 2011 at 5:42 PM, Brian Schott <[email protected]> wrote:
> 1.a.) Not yet, but our branch unit tests (when we get there) will certainly 
> test the architecture-related columns we added to instances, instance_types, 
> and compute_node tables.
>
> 1.b) Is that a unit test responsibility or an integration test farm with 
> different "typical" configurations that gets built, deployed, populated, and 
> tested?  Agree it should happen before a branch gets merged.

Either one :) Having a test for scenarios where a column is moved from
one table to another is critical, IMHO, as failing that test
introduces a data loss bug, which is unacceptable to me.

> 2) They were pretty simple changes, so I just replicated from a previous 
> python script examples in migrate_repo/versions.
>
> The point I was making that I did what anybody in a hurry will do, crib from 
> the previous example.  I just added downgrade() because the example I 
> followed didn't do that.  We can be propagating bad habits.  Realize, this is 
> Nova, not Glance, so sorry if off topic.

No worries at all. Nova hasn't seen these issues (yet) for two reasons:

a) No test cases for the migrations
b) None of the models in Nova have a column that is created with
index=True. The index=True creates a secondary index on the column. In
the case of SQLite, this leads to the bug (issue 117 in sa-migrate)
described in the original post when you try to alter the table with a
Python migrate script.

Anyway, here's the good news (I hope!) :)

It occurred to me sometime as I slept last night that I might be able
to have *both* a Python migrate script *and* a SQL migrate script
(just for SQLite) that would be picked up properly by sa-migrate for
the same database version. After reviewing the code this morning, I
believe this is true. I'm testing the theory out this morning and will
update this thread with what I find.

-jay

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