zyedu/application/wap/model/topic/TestPaperCategory.php

<?php
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namespace app\wap\model\topic;

use traits\ModelTrait;
use basic\ModelBasic;
use service\UtilService as Util;

/**
 * 试卷分类 Model
 * Class TestPaperCategory
 */
class TestPaperCategory extends ModelBasic
{
    use ModelTrait;

    public function children()
    {
        return $this->hasMany('TestPaperCategory', 'pid', 'id')->where(['is_del' => 0, 'is_show' => 1])->order('sort DESC,id DESC');
    }
}