d59114c46ac4_change_constrains.py 文件源码

def downgrade():
    table_prefix = context.config.get_main_option('table_prefix')
    op.drop_constraint('_repo_name_unique',
                       table_prefix + 'repos')

    op.alter_column(table_prefix + 'repos',
                    'user_key',
                    existing_type=sa.UnicodeText(),
                    type_=sa.String(255))