yxbd-fangke/app/Models/Study.php

<?php

namespace App\Models;

class Study extends SoftDeletesModel
{
    protected $guarded = ['id'];

    protected $casts = [
        'file' => 'json'
    ];
    protected $appends = ['file_detail'];

    public function asks()
    {
        return $this->hasMany(StudyAsk::class, 'study_id', 'id');
    }

    public function getFileDetailAttribute()
    {
        if (empty($this->file)) {
            return [];
        }
        return Upload::whereIn('id', $this->file)->get();
    }

}