Why I can not call Implementation method from library class? - laravel

Question

In laravel 9 app I created class app/Implementations/LocalStorageUploadedFileManagement.php :
<?php
namespace App\Implementations;
use App\Interfaces\UploadedFileManagement;
...
use Intervention\Image\Facades\Image as Image;
class LocalStorageUploadedFileManagement implements UploadedFileManagement
{
...
public function getImageFileDetails(string $itemId, string $image = null, string $itemUploadsDirectory = '',
bool $skipNonExistingFile = false): array {
\Log::info('++ getImageFileDetails$image ::');
\Log::info( $image );
}
...
and Interface class in app/Interfaces/UploadedFileManagement.php :
<?php
namespace App\Interfaces;
use Illuminate\Http\Request;
interface UploadedFileManagement
{
...
public function getImageFileDetails(string $itemId, string $image = null, string $itemUploadsDirectory = '',
bool $skipNonExistingFile = false): array;
}
In app/Providers/AppServiceProvider.php I have:
class AppServiceProvider extends ServiceProvider
{
public function register()
{
$this->app->bind('App\Interfaces\UploadedFileManagement', 'App\Implementations\LocalStorageUploadedFileManagement');
}
so I can use it in my controller app/Http/Controllers/Admin/ProductController.php:
<?php
namespace App\Http\Controllers\Admin;
...
use App\Interfaces\UploadedFileManagement;
class ProductController extends Controller // http://local-mng-products.com/admin/products
{
public function __construct()
{
}
public function edit(string $productId, UploadedFileManagement $uploadedFileManagement)
{
...
$productImgProps = $uploadedFileManagement->getImageFileDetails(
itemId : $product->_id,
itemUploadsDirectory : Product::getUploadsProductDir(),
image : $product->image,
skipNonExistingFile : true);
...
abd it works ok
But I got error :
Cannot instantiate interface App\Interfaces\UploadedFileManagement
when I try to use UploadedFileManagement in library app/Library/ReportProduct.php class :
<?php
namespace App\Library;
use App\Interfaces\UploadedFileManagement;
...
class ReportProduct
{
public function getImageProps()
{
$uploadedFileManagement= new UploadedFileManagement(); // This line raised the error
$imgProps = $uploadedFileManagement->getImageFileDetails($this->product->_id, $this->product->image, Product::getUploadsProductDir(),true);
return $imgProps;
}
getImageProps method is called from ProductCardReport component, which I created with command :
php artisan make:component ProductCardReport
and it has in file app/View/Components/ProductCardReport.php :
<?php
namespace App\View\Components;
use App\Library\ReportProduct;
use Illuminate\View\Component;
class ProductCardReport extends Component
{
public string $productId;
public function __construct(string $productId)
{
$this->productId = $productId;
}
public function render()
{
$reportProduct = new ReportProduct($this->productId);
$reportProduct->loadProduct();
$productData = $reportProduct->getProductData(true);
$productImgProps = $reportProduct->getImageProps();
...
Why I got error in ReportProduct.php class on using of UploadedFileManagement service?
How that can be done ?
MODIFIED BLOCK :
I tried to inject it in the same way I did in ProductController edit function.
But I failed as If I try to edit app/Library/ReportProduct.php with similar injection :
<?php
namespace App\Library;
use App\Interfaces\UploadedFileManagement;
...
class ReportProduct
{
public function __construct(Product | string $product, UploadedFileManagement $uploadedFileManagement = null)
{
$this->uploadedFileManagement = $uploadedFileManagement;
...
But as I create ReportProduct and call getImageProps from app/View/Components/ProductCardReport.php component
I need to UploadedFileManagement class from somewhere for the 1st time . I can not inject
UploadedFileManagement in app/View/Components/ProductCardReport.php.
Not shure how injection works here and how can I use it in chain Component->customClass?
Thanks!

Answer 1

Your UploadedFileManagement is an object interface and interfaces are not instantiable (a fancy way of saying you can't create an instance of an interface - i.e. new UploadedFileManagement()).
Binding an interface and an implementation in the Laravel service container doesn't magically transform your code to use the implementation wherever you have made use of the interface. All it does is tell Laravel how to resolve a dependency when it encounters one.
To clarify this when you run your application
$service = new UploadedFileManagement();
Doesn't get converted to
$service = new LocalStorageUploadedFileManagement();
That is not how dependency injection or the service container work.
If you want to make use of your LocalStorageUploadedFileManagement() class in the ReportProduct class, you will need to inject it in the same way you have done with your ProductController edit function.

Answer 2

Valid decision is :
$uploadedFileManagement= app(UploadedFileManagement::class);
$productImgProps = $uploadedFileManagement->getImageFileDetails(
itemId : $product->_id,
itemUploadsDirectory : Product::getUploadsProductDir(),
image : $product->image,
skipNonExistingFile : true);