so, alembic not support `default` ( pgsql create columnn ) ?
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
> <javascript:>> 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.
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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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