Il 31/10/18 16:32, Mike Bayer ha scritto:
On Wed, Oct 31, 2018 at 11:00 AM Riccardo Magliocchetti
<riccardo.magliocche...@gmail.com> wrote:
Hello,
we'd like to use Postgresql xmin column for optimistic concurrency, so we
declared the column as:
xmin = Column("xmin", Integer, system=True, server_default=FetchedValue())
The problem is when autogenerating a migration with alembic (via flask-migrate)
the xmin column is added to
the operations so the migrations fails.
is the column generated inside the migration including the
"system=True" flag? if that flag is present then the column won't be
created. Or are you referring to an alter table operation? Need
specifics on the failure and then we need to post a bug report if
there is in fact a problem.
It's a create table, the flag is not there:
op.create_table('user',
...
sa.Column('xmin', sa.Integer(), server_default=FetchedValue(),
nullable=True),
--
Riccardo Magliocchetti
@rmistaken
http://menodizero.it
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