17fd243e4dc4_make_description_not_nullable_and_unique.py 文件源码

def downgrade():
    # ### commands auto generated by Alembic - please adjust! ###
    op.drop_constraint(None, 'event', type_='unique')
    op.alter_column('event', 'description',
               existing_type=sa.VARCHAR(),
               nullable=True)
    # ### end Alembic commands ###