Laravel 8 ErrorException：尝试访问 null 类型值的数组偏移量

Question

我正在与 Laravel 一起开发我的项目，基本上我想根据我的主题从数据库中编辑一些文章，所以我创建了一个 blade 称为 edit.blade.php 并且在此 blade 中，有一行获取文章的当前图像：

<div class="row">
    @foreach($article->images['images'] as $key => $image) 
        <div class="col-sm-2">
            <label class="control-label">
                {{$key}}
                <input type="radio" name="imagesThumb" value="{{ $image }}" {{ $article->images['thumb'] ? 'checked' : '' }} />
                <a href="{{$image}}"><img src="{{$image}}" width="100%"></a>
            </label>
        </div>
    @endforeach
</div>

文章模型也是这样的：

class Article extends Model
{
    use HasFactory;
    use Sluggable;

    protected $guarded = [];

    protected $casts = [
        'images' => 'array'
    ];

    public function sluggable()
    {
        return [
            'slug' => [
                'source' => 'title'
            ]
        ];
    }

    public function path()
    {
        return "/article/$this->slug";
    }
}

这是调用 blade:

的 ArticleController edit 方法

public function edit(Article $article)
{
    return view('website.backend.articles.edit',compact('article'));
}

现在的问题是，每当我想转到这个 blade 时，它 returns 这个错误：

ErrorException Trying to access array offset on value of type null (View: edit.blade.php)

指的是blade这一行：

@foreach($article->images['images'] as $key => $image)

所以我不知道为什么会显示这个错误，如果你知道请告诉我，我非常感谢你们的任何想法...

提前致谢。

更新#2：

这是我 store ArticleController 的方法：

public function store(ArticleRequest $request)
{
    //auth()->loginUsingId(1);
    $imageUrl = $this->uploadImages($request->file('images'));
    auth()->user()->article()->create(array_merge(['images' => $imageUrl], $request->all()));
    return redirect(route('articles.index'));
}

这里是 UploadImages 方法附带的 AdminController 并由 ArticleController:

扩展

class AdminController extends Controller
{
    protected function uploadImages($file)
    {
        $year = Carbon::now()->year;
        $imagePath = "/upload/images/{$year}/";
        $filename = $file->getClientOriginalName();
        $file = $file->move(public_path($imagePath), $filename);
        $sizes = ["300","600","900"];
        $url['images'] = $this->resize($file->getRealPath(), $sizes, $imagePath, $filename);
        $url['thumb'] = $url['images'][$sizes[0]];
        return $url;
    }
    private function resize($path, $sizes, $imagePath, $filename)
    {
        $images['original'] = $imagePath . $filename;
        foreach($sizes as $size)
        {
            $images[$size] = $imagePath . "{$size}" . $filename;
            Image::make($path)->resize($size, null, function($constraint){
                $constraint->aspectRatio();
            })->save(public_path($images[$size]));
        }
        return $images;
    }
}

更新#1：

dd($article); 的输出是：

    App\Models\Article {#1234 ▼
  #guarded: []
  #casts: array:1 [▼
    "images" => "array"
  ]
  #connection: "mysql"
  #table: "articles"
  #primaryKey: "id"
  #keyType: "int"
  +incrementing: true
  #with: []
  #withCount: []
  #perPage: 15
  +exists: true
  +wasRecentlyCreated: false
  #attributes: array:12 [▼
    "id" => 2
    "user_id" => 1
    "title" => "asdasd"
    "slug" => "asdasd"
    "description" => "asdsadas"
    "body" => "asdsada"
    "images" => "F:\xampp\tmp\php1825.tmp"
    "tags" => "asdsad"
    "viewCount" => 0
    "commentCount" => 0
    "created_at" => "2020-11-09 12:24:33"
    "updated_at" => "2020-11-09 12:24:33"
  ]
  #original: array:12 [▼
    "id" => 2
    "user_id" => 1
    "title" => "asdasd"
    "slug" => "asdasd"
    "description" => "asdsadas"
    "body" => "asdsada"
    "images" => "F:\xampp\tmp\php1825.tmp"
    "tags" => "asdsad"
    "viewCount" => 0
    "commentCount" => 0
    "created_at" => "2020-11-09 12:24:33"
    "updated_at" => "2020-11-09 12:24:33"
  ]
  #changes: []
  #classCastCache: []
  #dates: []
  #dateFormat: null
  #appends: []
  #dispatchesEvents: []
  #observables: []
  #relations: []
  #touches: []
  +timestamps: true
  #hidden: []
  #visible: []
  #fillable: []
}

Answer 1

是因为这一行：

auth()->user()->article()->create(array_merge(['images' => $imageUrl], $request->all()));

$request->all() 包含一个设置为临时路径 (F:\xampp\tmp\php1825.tmp) 的键 images，在 array_merge 中，后面参数中的值会覆盖前面参数中的值。要修复它，只需像这样交换参数：

auth()->user()->article()->create(array_merge($request->all(), ['images' => $imageUrl]));

Laravel 8 ErrorException：尝试访问 null 类型值的数组偏移量

Laravel 8 ErrorException: Trying to access array offset on value of type null

php

laravel

laravel-8

更新#2：

更新#1：