Неопределенное свойство: Illuminate\Database\Eloquent\Relations\BelongsTo

Я получаю эту ошибку Неопределенное свойство:

Illuminate\Database\Eloquent\Relations\BelongsTo::$name (View: C:\xampp\htdocs\ESchool\resources\views\front\index.blade.php)

и я не знаю, что не так

это часть моей индексной страницы, где я получаю сообщение об ошибке <

div class = "special_cource_text">
                        <a href = "../../../../../../Users/Khaldoun%20Alhalabi/Desktop/etrain/course-details.html"
                            class = "btn_4">{{$course->categories()->name}}</a>

а вот моя модель категории

    <?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Category extends Model
{
    use HasFactory;
    protected $table = "categories"  ;
    protected $primaryKey = "id" ;
    public $timestamps = true ;
    protected $fillable =
    [
        'name' ,
    ] ;


    /**
     * Get all of the comments for the Category
     *
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function courses()
    {
        return $this->hasMany(Course::class, 'foreign_key');
    }
}

а вот моя курсовая модель

    <?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Course extends Model
{
    use HasFactory;
    protected $table = "courses"  ;
    protected $primaryKey = "id" ;
    public $timestamps = true ;
    protected $fillable =
    [
        'name' ,
        'image' ,
        'price' ,
        'small_description' ,
        'description' ,

    ] ;
  public function categories()
    {
        return $this->belongsTo(Category::class);
    }
    public function trainers()
    {
        return $this->belongsTo(Trainer::class);
    }
    public function students()
    {
        return $this->belongsTo( Student::class );
    }
}