Thanks a lot Mike! On Wednesday, October 31, 2018 at 7:43:51 PM UTC+1, Mike Bayer wrote:
> here's the issue: > > > https://bitbucket.org/zzzeek/alembic/issues/515/system-true-not-generated-for-column > > <https://www.google.com/url?q=https%3A%2F%2Fbitbucket.org%2Fzzzeek%2Falembic%2Fissues%2F515%2Fsystem-true-not-generated-for-column&sa=D&sntz=1&usg=AFQjCNHl8pc8qFcNHFFEcHTwrEWF415Qug> > > > and here is a patch to resolve: > > https://gerrit.sqlalchemy.org/#/c/zzzeek/alembic/+/910 > > On Wed, Oct 31, 2018 at 11:49 AM Riccardo Magliocchetti > <riccardo.ma...@gmail.com <javascript:>> wrote: > > > > Il 31/10/18 16:32, Mike Bayer ha scritto: > > > On Wed, Oct 31, 2018 at 11:00 AM Riccardo Magliocchetti > > > <riccardo.ma...@gmail.com <javascript:>> 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 > > > > -- > > You received this message because you are subscribed to the Google > Groups "sqlalchemy-alembic" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to sqlalchemy-alembic+unsubscr...@googlegroups.com <javascript:>. > > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "sqlalchemy-alembic" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy-alembic+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
