wx.sstbc.com/app/Models/Book.php

<?php

namespace App\Models;

class Book extends SoftDeletesModel
{

    /**
     * The attributes that should be cast.
     *
     * @var array
     */
    protected $casts = [
        'other_data' => 'json'
    ];

    /**
     * Get the cover image for the book.
     */
    public function cover()
    {
        return $this->hasOne(Upload::class, 'id', 'cover_id');
    }
}