like this:
old model:
class TestModel:
ip = db.Column(db.INET, nullable=False)
new Model:
class TestModel:
ip = db.Column(db.VARCHAR(), nullable=False, server_default='127.0.0.1')
got migration:
op.alter_column('test', 'ip',
existing_type=postgresql.INET(),
type_=sa.VARCHAR(),
nullable=False)
no default set.
在 2018年9月6日星期四 UTC+8下午9:54:23，Mike Bayer写道：
>
> On Thu, Sep 6, 2018 at 3:50 AM, Yingchen Zhang <cevin....@gmail.com
> <javascript:>> wrote:
> > so, alembic not support `default` ( pgsql create columnn ) ?
>
> it does. use server_default. "default" in SQLAlchemy refers to a
> Python-side default.
>
>
> >
> > 在 2018年9月6日星期四 UTC+8上午12:24:54，Mike Bayer写道：
> >>
> >> On Wed, Sep 5, 2018 at 11:51 AM, Yingchen Zhang <cevin....@gmail.com>
> >> wrote:
> >> > db.Column('text_column', db.VARCHAR(20), default='test_text',
> >> > server_default='test_text', nullable=True)
> >> >
> >> > but, generated code like:
> >> >
> >> > sa.Column('text_column', sa.VARCHAR(20), nullable=True),
> >>
> >> I assume you are using Alembic autogeneration. The Python-side
> >> default "test_text" is not needed in an alembic autogeneration. The
> >> server_default however will be rendered.
> >>
> >>
> >> I ran your column as given:
> >>
> >> target_metadata = MetaData()
> >>
> >> Table(
> >> 't', target_metadata,
> >> Column('text_column', VARCHAR(20), default='test_text',
> >> server_default='test_text', nullable=True)
> >> )
> >>
> >> alembic generates:
> >>
> >> def upgrade():
> >> # ### commands auto generated by Alembic - please adjust! ###
> >> op.create_table('t',
> >> sa.Column('text_column', sa.VARCHAR(length=20),
> >> server_default='test_text', nullable=True)
> >> )
> >> # ### end Alembic commands ###
> >>
> >>
> >>
> >> >
> >> >
> >> > how to set column default value ?
> >> >
> >> > --
> >> > SQLAlchemy -
> >> > The Python SQL Toolkit and Object Relational Mapper
> >> >
> >> > http://www.sqlalchemy.org/
> >> >
> >> > To post example code, please provide an MCVE: Minimal, Complete, and
> >> > Verifiable Example. See http://stackoverflow.com/help/mcve for a
> full
> >> > description.
> >> > ---
> >> > You received this message because you are subscribed to the Google
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> >> > "sqlalchemy" group.
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> >> > an
> >> > email to sqlalchemy+...@googlegroups.com.
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> >> > For more options, visit https://groups.google.com/d/optout.
> >
> > --
> > SQLAlchemy -
> > The Python SQL Toolkit and Object Relational Mapper
> >
> > http://www.sqlalchemy.org/
> >
> > To post example code, please provide an MCVE: Minimal, Complete, and
> > Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> > description.
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--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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