migrate:run不创建表也不会报错

[unicornboat]

迁移的时候报错"extra" is not a valid column option. 应该怎么办？

class Contact extends Migrator
{
    public function change()
    {
        $table = $this->table('contact');
        $table->addColumn('user_id', 'integer', ['comment' => '用户 ID'])
            ->addColumn('contact_id', 'integer', ['comment' => '联系人 ID'])
            ->addColumn('type', 'enum', ['values' => ['normal', 'blocked'], 'default' => 'normal', 'comment' => '关系类型'])
            ->addColumn('created_at', 'datetime', array('null' => true, 'default' => 'CURRENT_TIMESTAMP', 'comment' => '创建时间'))
            ->addColumn('updated_at', 'datetime', array('null' => true, 'default' => 'CURRENT_TIMESTAMP', 'extra' => 'ON UPDATE CURRENT_TIMESTAMP', 'comment' => '更新时间'))
            ->create();
    }

    public function down()
    {
        $this->dropTable('contact');
    }
}

[yuanzhihai]

'extra' => 'ON UPDATE CURRENT_TIMESTAMP', 删除