requies minimum number of characters to match version numbers in commands

[claweyenuk]

Can version matching get more strict?

https://github.com/sqlalchemy/alembic/blob/master/alembic/script/revision.py#L376

Ideally, something like if len(resolved_id) < 3 set revs = [].

I went to downgrade an database, and accidentally typed alembic downgrade 1 instead of alembic downgrade -1 and happened to have a single revision start with a "1", so the downgrade continued.

DB migrations can result in data loss, I think it's ok to require a certain number of characters when identifying the migration.

[zzzeek]

this is acceptable if someone wants to work on it.

[claweyenuk]

Great! Thanks!

I'll plan to do it in the next few weeks (though if anyone sees this message, feel free to pick this change up)

[zzzeek]

please ensure your PR has tests in tests/test_command.py

[claweyenuk]

Will do

[sqla-tester]

Mike Bayer has proposed a fix for this issue in the master branch:

Only allow partial revision match for > 3 characters https://gerrit.sqlalchemy.org/1466

[claweyenuk]

Thanks for making a fix. (Sorry I never got around to it). This is exactly what I was thinking of.