xtu_mall/app/admin/model/links/Links.php

<?php
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// | Links模型
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namespace app\admin\model\links;

use think\facade\Db;
use think\Model;

/**
 * 模型
 */
class Links extends Model
{
    protected $autoWriteTimestamp = true;

    public function getStatusList()
    {
        return ['未通过', '已通过'];
    }

    public static function onBeforeWrite($row)
    {
        if (isset($row['termsname']) && $row['termsname']) {
            $res = Terms::where(["name" => $row['termsname'], "module" => "links"])->find();
            if ($res > 0) {
                throw new \Exception("该分类已经存在！");
            }
            $term = Terms::create([
                "name"   => $row['termsname'],
                "module" => "links",
            ]);
            $row['terms_id'] = $term->id;
        }
    }

    public static function onBeforeDelete($row)
    {
        Db::name('links_data')->where('did', $row->id)->delete();
    }
}