On 06/08/2016 09:21 AM, Søren Løvborg wrote:
Hi,
What's the best practice for "tagging" an Alembic revision, that is to
denote e.g. that 1ffbeb5179a5 is the database revision matching version
1.4.0 of the software?
I can do it in documentation, of course, but would prefer a method
allowing e.g. "alembic downgrade v1.2.1".
I guess I could simply rename the revision identifier to "v1.4.0", since
Alembic apparently doesn't strictly enforce that identifiers must be
hexadecimal? That does seem like quite a hack, though, and causes
problems with prefix-matching ("v1.1" could match "v1.12"). It's also
not clear whether it's safe to assume that Alembic will continue to
allow arbitrary strings as revision IDs.
Branch labels does not seem like a good fit for solving the problem either.
Branch labels are exactly what solves this? What's wrong with using a
branch label? you put "v1.2.1" as a branch label in the target revision
and then your "alembic downgrade v1.2.1" command works exactly.
if this is just a matter of documentation update and perhaps adding
another entry "tags" which just adds itself to "branch_labels", that's
fine.
of course, if you actually git tag your project, the head revision file
can be located from that git tag. That is, I can write a script right
now to deliver the correct alembic revision given a git tag against the
repo. To make it seamless, a recipe that adds a new Alembic command
would be fine however Alembic would need to have a nicer way to add new
commands and/or to extend the existing commands.
Would there be interest in adding a dedicated tagging feature?
Best,
Søren
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