这样行不行

public function rules()
{
   return [
        [['name'],'integer','on'=>['add']],
        [['name'],'required']
    }

这样不知道行不行，你试试

        [['username'],'unique','when' => function ($model) {
            return $this->isNewRecord || ($this->username != $model->username);
        }],

@oldnew $oldName要自己设置吗