Ah ok, for sure you're thinking about covering more cases than I am.

Thanks for your reply :)

On Sat, Aug 5, 2017 at 9:02 AM, Mike Bayer <clas...@zzzcomputing.com> wrote:

>
>
> On Aug 5, 2017 8:40 AM, "Philippe Lavoie" <philippe.lavo...@gmail.com>
> wrote:
>
> Let's say you're on branch and you have a migration, you test it out, it
> works: everything is cool. The version in `public.alembic_version` is your
> latest migration.
> Before you merge it you have to switch to a different branch to work on
> something else and you also have a migration there.
>
> You want to use `alembic stamp` to move back to the previous state, but
> `alembic` will complain that it can't find the revision stored in
> `public.alembic_version`, since it was in your other branch.
>
> The work around is to just drop the table and redo the stamp. I think it
> would be convenient for `alembic` to bypass this check, what do you think?
>
>
>
> It's unfortunately not possible in the general case because a stamp may or
> may not affect existing rows in the table depending on their relationship
> to the stamp you are specifying.  Without the version files present, it
> doesn't know anything about them.  If you're sure about the rows which go
> away, you can DELETE them (no need for DROP).
>
>
> I suppose a "purge-all" option to "stamp" could add this delete as a
> convenience but it would need to carry appropriate warnings.
>
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