orm中访问器跟关系起冲突怎么解决

查询媒体附件信息

$medium = CasesMedia::query()->find(1);
dd($medium->thumbAttachment);

获取不到数据,后来发现定义了getThumbAttribute访问器, 在ORM关系中数据被修改了,无法查询到

模型定义

<?php

namespace App\Models;

use Illuminate\Support\Facades\Storage;

class CasesMedia extends BaseModel
{
    protected $table = 'cases_media';
    protected $guarded = [];
    protected $primaryKey = 'id';

    /**
     * 设置缩略图完整路径
     * @param $url
     * @return string
     */
    public function getThumbAttribute($url): string
    {
        return config('filesystems.disks.his.driver') == 'local' ? tenant_asset($url) : Storage::disk('his')->url($url);
    }

    /**
     * 设置媒体文件完整路径
     * @param $url
     * @return string
     */
    public function getFilePathAttribute($url): string
    {
        return config('filesystems.disks.his.driver') == 'local' ? tenant_asset($url) : Storage::disk('his')->url($url);
    }

    /**
     * 缩略图附件
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function thumbAttachment()
    {
        return $this->belongsTo(Attachment::class, 'thumb', 'file_path')
            ->where('model_id', $this->cases_id);
    }

    /**
     * 大图附件
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function filePathAttachment()
    {
        return $this->belongsTo(Attachment::class, 'file_path', 'file_path')
            ->where('model_id', $this->cases_id);
    }
}