User.php

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Laratrust\Traits\LaratrustUserTrait;
use App\Book;
use App\BorrowLog;
use App\Exceptions\BookException;
use Illuminate\Support\Facades\Mail;

class User extends Authenticatable
{
    use LaratrustUserTrait;
    use Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password',
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
  

    public function borrow(Book $book)
    {
        if ($book->stock < 1) {
            throw new BookException("Makanan $book->title sedang tidak tersedia.");
        }

        if($this->borrowLogs()->where('book_id',$book->id)->where('is_returned', 0)->count() > 0 ) {
            throw new BookException("Makanan $book->title sedang Anda pesan.");
        }

        $borrowLog = BorrowLog::create(['user_id'=>$this->id, 'book_id'=>$book->id]);
        return $borrowLog;
    }

    public function borrowLogs()
    {
        return $this->hasMany('App\BorrowLog');
    }

   
}