试图获取非对象的属性“名称”（查看：C:\xampp\htdocs\COMPLIANCE-FAQ\resources\views\respones\show.blade.php）

Question

我有 4 个表（用户、ask_questions、respones、类别）。 我试图显示每个回答完成的问题，但我收到了这个错误： 试图获取非对象的属性“名称”（查看：C:\xampp\htdocs\COMPLIANCE-FAQ\resources\views\respones\show.blade.php）

模型respone.php

{
    public $table = 'respones';

    protected $dates = [
        'created_at',
        'updated_at',
        'deleted_at',
    ];

    protected $fillable = [
        'updated_at',
        'created_at',
        'deleted_at',
        'category_id',
        'author_name',
        'text_answer',
        'author_email_id',
        'ask_question_id',
    ];

    public static function boot()
    {
        parent::boot();

        Respone::Observe(new \App\Observers\ResponeObserver );

    }

    public function category()
    {
        return $this->belongsTo(Category::class, 'category_id');
    }

    public function author_email()
    {
        return $this->belongsTo(User::class, 'author_email_id');
    }

    public function ask_question()
    {
        return $this->belongsTo(AskQuestion::class, 'ask_question_id');
    }
}

AskQuestion.php

protected $dates = [
    'created_at',
    'updated_at',
    'deleted_at',
];

protected $fillable = [
    'email',
    'created_at',
    'updated_at',
    'deleted_at',
    'text_question',
    'objet_question',
    'assigned_to_user_id',
];

public static function boot()
{
    parent::boot();

    AskQuestion::Observe(new \App\Observers\AskQuestionObserver );

    static::addGlobalScope(new CollaborateurScope);
}

/**
* In this method may be it should belongsto instead of hasmany
*/
public function respones()
{
    return $this->hasOne(Respone::class, 'ask_question_id', 'id');
}

public function assigned_to_user()
{
    return $this->belongsTo(User::class, 'assigned_to_user_id');
}

用户.php

public function askQuestionRespones()
{
    return $this->hasMany(Respone::class, 'user_id', 'id');
}

show.blade.php

               <div class="card-body">
                <table class="table table-bordered table-striped">
                    <tbody>
                        <tr>
                            <th>
                                {{ trans('Thématique') }}
                            </th>
                            <td>
                                {{ $respone->category->name }}
                            </td>
                        </tr>
                        <tr>
                            <th>
                                {{ trans('Nom auteur') }}
                            </th>
                            <td>
                                {{ $respone->author_name }}
                            </td>
                        </tr>
                        <tr>
                            <th>
                                {{ trans('Auteur email') }}
                            </th>
                            <td>
                                {{ $respone->author_email->email }}
                            </td>
                        </tr>
                        <tr>
                            <th>
                                {{ trans('Question') }}
                            </th>
                            <td>
                                {{ $respone->ask_question->text_question }}
                            </td>
                        </tr>
                        <tr>
                            <th>
                                {{ trans('Réponse') }}
                            </th>
                            <td>
                                {{ $respone->text_answer }}
                            </td>
                        </tr>
                    </tbody>
                </table>

管理部分的ResponesController.php

public function show(Respone $respone)
{
    abort_if(Gate::denies('respone_show'), Response::HTTP_FORBIDDEN, '403 Forbidden');

    $respone->load('category', 'author_email', 'ask_question');

    return view('admin.respones.show', compact('respone'));
}

前面部分的ResponeController.php

public function show(Respone $respone, Category $category,
                     User $user, AskQuestion $ask_question)
{
    $respone->load('author_email', 'category', 'ask_question');

    $ask_question->load('Respones');

    return view('respones.show', compact('respone', 'ask_question'));
}

Answer 1

其中一个关系返回 null

$respone->category
$respone->ask_question
$respone->author_email

因此，当您尝试访问空关系（在空值 null->attribute 上）的属性时，您会收到此错误。

您可以尝试在回显属性之前检查每个关系的值，使用@if 或@isset

@if($respone->category)

@endif

或用optional 助手包装关系

<th>
    {{ trans('Thématique') }}
</th>
<td>
    {{ optional($respone->category)->name }}
</td>

Answer 2

您可以使用null coalescing operator ??（在 PHP 7 中引入）。它用于检查值是否设置或为空，或者换句话说，如果值存在且不为空，则返回第一个操作数，否则返回第二个操作数。”

<td>
  {{ $respone->category->name ?? 'Default' }} 
</td>