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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Sylius\ShopApiPlugin\Factory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Sylius\Component\Attribute\Model\AttributeValueInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Sylius\Component\Core\Model\ChannelInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Sylius\Component\Core\Model\ProductImageInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Sylius\Component\Core\Model\ProductInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Sylius\Component\Core\Model\TaxonInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Sylius\ShopApiPlugin\View\ProductView;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                final class ProductViewFactory implements ProductViewFactoryInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var ImageViewFactoryInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $imageViewFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var ProductAttributeValuesViewFactoryInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $attributeValuesViewFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $fallback;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param ImageViewFactoryInterface $imageViewFactory  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param ProductAttributeValuesViewFactoryInterface $attributeValuesViewFactory  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $fallback  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ImageViewFactoryInterface $imageViewFactory,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ProductAttributeValuesViewFactoryInterface $attributeValuesViewFactory,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fallback  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->imageViewFactory = $imageViewFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->attributeValuesViewFactory = $attributeValuesViewFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->fallback = $fallback;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    public function create(ProductInterface $product, ChannelInterface $channel, $locale)  | 
            
            
                                                        
            
                                    
            
            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        $productView = new ProductView();  | 
            
            
                                                        
            
                                    
            
            
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                        $productView->name = $product->getTranslation($locale)->getName();  | 
            
                            
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                        $productView->code = $product->getCode();  | 
            
            
                                                        
            
                                    
            
            
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                        $productView->slug = $product->getTranslation($locale)->getSlug();  | 
            
                            
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                        /** @var ProductImageInterface $image */  | 
            
            
                                                        
            
                                    
            
            
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                        foreach ($product->getImages() as $image) { | 
            
            
                                                        
            
                                    
            
            
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                            $imageView = $this->imageViewFactory->create($image);  | 
            
            
                                                        
            
                                    
            
            
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                            $productView->images[] = $imageView;  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        /** @var TaxonInterface $taxon */  | 
            
            
                                                        
            
                                    
            
            
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                        foreach ($product->getTaxons() as $taxon) { | 
            
            
                                                        
            
                                    
            
            
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                            $productView->taxons[] = $taxon->getCode();  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        $productView->attributes = $this->attributeValuesViewFactory->create($product->getAttributesByLocale($locale, $this->fallback));  | 
            
                            
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                        return $productView;  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: