未定义属性: Illuminate\Database\Eloquent\Relations\BelongsTo

Question

我得到了一个未定义的错误属性：

Illuminate\Database\Eloquent\Relations\BelongsTo::$name

(视图: C:\xampp\htdocs\ESchool\resources\views\front\index.blade.php) )

我不知道是怎么回事

这是我的索引页面中获得错误<的部分。

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

在这里我的分类模型

    <?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');
    }
}

在这里我的课程模型

    <?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 );
    }
}

Answer 1

我解决了，问题是以外键的名义命名为cat_id，但肯定是category_id在laravel https://laravel.com/docs/9.x/eloquent-relationships#one-to-many的文档中找到的。

Answer 2

1. 将public function categories()改为public function category()

(其他职能相同。BelongsTo返回一个对象，因此函数名应该是单数)

• --在您的模型中没有看到category_id，但我假设它在那里。

$course->category->name