If someone new come to the project and they use db.create_all() or some
script to create a fresh new database with declared models. There is no
alembic_version table and he/she will run into problems when doing the
upgrade. Is there something in alembic to support it? I have been poking
around and came up with the following:
alembic_cfg = Config("alembic.ini")
context = MigrationContext.configure(db.engine.connect())
current_rev = context.get_current_revision()
context._ensure_version_table()
script = ScriptDirectory.from_config(alembic_cfg)
head_revision = script.get_current_head()
context.stamp(script, head_revision)
command.downgrade(alembic_cfg, "base")
However, it works with file based sqlite db but no in memory one:
Error: Destination base is not a valid downgrade target from current head(s)
It seems the migrationcontext use different from the one I generated and
the one used in the alembic, so the current revision was empty when I do
the downgrade (just for. Not sure why file based sqlite works.
Thanks.
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