<?php
namespace app\portal\model;

use think\facade\Db;
use think\Model;
\\在模型引入
use think\model\concern\SoftDelete;

class CopTopicsModel extends Model
{
  
    \\模型中使用
    use SoftDelete;
    protected $name = 'cop_topics';
    protected $autoWriteTimestamp=true;
    protected $deleteTime="delete_time";
    
    public function user(){
        return $this->belongsTo(User::class,"uid","id");
    }
}

软删除时候delete_time默认是为NULL

使用Db::name(“xxxx”)->where($where)->delete()这样是不使用软删除，必须使用模型实例化才可以。