Question

我有一个控制器和FileUploader :: class。上载器已注入控制器__construct方法。当我在代码中使用这个注入的实例时（请参见下面的内容），每次都得到相同的obj。我在不使用注入属性的情况下重构了类（请参阅第二部分代码）-它可以工作。但是我想在整个项目中遵循相同的风格。

当它是一个文件上传时，它可以正常工作，但是对于具有循环的多个文件上传解决方案，它不起作用。

class ProposalFileController extends Controller
{
    public $fileUploader;

    public function __construct(FileUploader $fileUploader)
    {
        $this->fileUploader = $fileUploader;
    }

    public function upload(ProposalFileUpload $request)
    {
        $files = [];

        foreach ($request->file('files') as $file)
        {

            /** !!! Attention here !!!!!!!
               In this loop, $this->fileUploader is same obj each time 
             **/
            $files[] = $this->fileUploader->upload($file);
        }

        return response()
            ->json([
               'data' => $files
            ]);
    }
}

我每次都需要一个新的上载器实例。该类波纹管有效，但我不喜欢这种风格。如何用DI解决方案解决呢？

class ProposalFileController extends Controller
{
    public $fileUploader;

    public function __construct(FileUploader $fileUploader)
    {
        $this->fileUploader = $fileUploader;
    }

    public function upload(ProposalFileUpload $request)
    {
        $files = [];

        foreach ($request->file('files') as $file)
        {
            $uploader = new FileUploader(new File());
            $files[] = $uploader->upload($file);
        }

        return response()
            ->json([
               'data' => $files
            ]);
    }
}

FileUpload :: class

class FileUploader implements Uploader
{
    use UploadHelper;

    private $file;

    public function __construct(File $file)
    {
        $this->file = $file;
    }

    public function upload(UploadedFile $file)
    {
        $saveName = $this->fileName($file);

        /** Save file to s3 */
        $storagePath = Storage::disk('s3')->put(...);

        /** Set cover_rel - relative path needed for delete file needs */
        $this->file->setAttribute('file_rel', $storagePath);

        $this->file->save();

        return $this->file;
    }
}

最后，我得到了具有相同File n次的数组（与循环步骤相同）

Answer 1

您可以使用下面的app方法在循环中注入FileUploader实例

$uploader = app(FileUploader::class)

Laravel控制器DI

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