screen/application/common/model/Comment.php

<?php

namespace app\common\model;

use think\Collection;
use think\Model;
use traits\model\SoftDelete;

/**
 * 短信验证码
 * @property Collection|Model commentable
 */
class Comment Extends Model
{
    use SoftDelete;
    protected $deleteTime='deleted_at';
    // 开启自动写入时间戳字段
    protected $autoWriteTimestamp = true;
    protected $createTime='created_at';
    protected $updateTime=false;
    protected $hidden=[
        'deleted_at',
        'commentable_id',
    ];
    public static $alias=[
        'video'=>Video::class,
    ];
    protected $append=[
    ];

    public function commentable(){
        return $this->morphTo('commentable',self::$alias);
    }
    public function user(){
        return $this->belongsTo(User::class);
    }













    /** system */
    protected static function init()
    {
        self::afterInsert(function (self $comment){
            if($comment->commentable_type=='video'){
                $info=Video::find($comment->commentable_id);
                $info && $info->setInc('comment_num');
            }
        });
        self::afterDelete(function (self $comment){
        });
    }
}