Laravel - Collection::delete 方法不存在

Question

我正在尝试测试 boot() static::deleting 方法，该方法应该在通过 Eloquent 删除模型时触发。

tinker App\User::find(6)->delete(); 中的命令返回“方法 [...]Collection::delete 不存在”。

如果我尝试使用 App\User::where('id', 6)->delete(); 那么 static::deleting 方法不会被触发，因为没有加载 Eloquent .如果我用 ->first() 加载 Eloquent，那么我会得到同样的错误，指出方法不存在。

这是整个用户模型

 <?php

namespace App;

use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;

class User extends Authenticatable
{
    use Notifiable;

    public function profile() {
        return $this->hasOne(Profile::class);
    }

    public function posts() {
        return $this->hasMany(Post::class);
    }

    public function tempUploads() {
        return $this->hasMany(TempUploads::class);
    }
    
    protected static function boot() {
        parent::boot();
        
        static::created(function ($user) {
            $user->profile()->create(['id' => $user->username, 'avatar' => '/storage/avatars/edit-profile.png']);
            mkdir(public_path() . "/storage/images/" . $user->username , 0755);

            // $data = [
            //  'user_id' => $user->username
            // ];
            // Mail::to($user->email)->send(new WelcomeMail($data));
        });

        static::deleting(function ($user) {
            $user->posts->delete();
            if ($user->profile->avatar != '/storage/avatars/edit-profile.png') {
                if ($user->profile->cover != NULL && $user->profile->cover != '') {
                    $oldAvatar = $_SERVER['DOCUMENT_ROOT'] . $user->profile->avatar;
                    $oldCover = $_SERVER['DOCUMENT_ROOT'] . $user->profile->cover;
                    if (is_file($oldAvatar) && is_file($oldCover)) {
                        unlink($oldAvatar);
                        unlink($oldCover);
                    } else {
                        die("Грешка при изтриване на стария файл. File does not exist in profile deleting method.");
                    }
                }
            }
            $user->profile->delete();
        });
    }

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

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'email_verified_at' => 'datetime',
    ];
}

我现在已经花了几个小时在谷歌上寻找可能的解决方案，但还没有找到。

如何在触发引导删除方法时正确删除用户模型？

Answer 1

在您的 deleting 监听器中，您正试图删除其他内容，这是导致错误的集合。

$user->posts 是与 Posts 的关系，它是一个复数形式，是一个 hasMany 关系(最有可能)，因此它返回一个 Collection always。集合没有 delete 方法。您将必须遍历集合并在每个帖子上调用 delete

// calling `delete()` on a Collection not a Model
// will throw the error you see
$user->posts->delete();

// iterate through the Collection
foreach ($user->posts as $post) {
    $post->delete();
}

旁注:您不能对模型和查询批量执行任何操作，也不能触发事件。所有模型事件都基于模型的单个实例。直接查询绕过模型。