de-user24-repo/app/Models/Course.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;

class Course extends Model
{
    /** @use HasFactory<\Database\Factories\UserFactory> */
    use HasFactory, Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var list<string>
     */
    protected $fillable = [
        'name',
        'description',
        'price',
    ];

    public function application(): HasOne
    {
        return $ths->hasOne(Application::class);
    }

    public function getFormatPrice(): string
    {
        return number_format($this->price, 0, ",", " ") . " Руб"; 
    }
}