| 1 |  |  | <?php | 
            
                                                                                                            
                            
            
                                    
            
            
                | 2 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 3 |  |  | namespace Sylius\ShopApiPlugin\Factory; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  | use Sylius\Component\Attribute\Model\AttributeValueInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  | use Sylius\Component\Core\Model\ChannelInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 7 |  |  | use Sylius\Component\Core\Model\ProductImageInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 8 |  |  | use Sylius\Component\Core\Model\ProductInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  | use Sylius\Component\Core\Model\TaxonInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  | use Sylius\ShopApiPlugin\View\ProductView; | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 11 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 12 |  |  | final class ProductViewFactory implements ProductViewFactoryInterface | 
            
                                                                        
                            
            
                                    
            
            
                | 13 |  |  | { | 
            
                                                                        
                            
            
                                    
            
            
                | 14 |  |  |     /** | 
            
                                                                        
                            
            
                                    
            
            
                | 15 |  |  |      * @var ImageViewFactoryInterface | 
            
                                                                        
                            
            
                                    
            
            
                | 16 |  |  |      */ | 
            
                                                                        
                            
            
                                    
            
            
                | 17 |  |  |     private $imageViewFactory; | 
            
                                                                        
                            
            
                                    
            
            
                | 18 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 19 |  |  |     /** | 
            
                                                                        
                            
            
                                    
            
            
                | 20 |  |  |      * @var ProductAttributeValueViewFactoryInterface | 
            
                                                                        
                            
            
                                    
            
            
                | 21 |  |  |      */ | 
            
                                                                        
                            
            
                                    
            
            
                | 22 |  |  |     private $attributeValueViewFactory; | 
            
                                                                        
                            
            
                                    
            
            
                | 23 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 24 |  |  |     /** | 
            
                                                                        
                            
            
                                    
            
            
                | 25 |  |  |      * @var string | 
            
                                                                        
                            
            
                                    
            
            
                | 26 |  |  |      */ | 
            
                                                                        
                            
            
                                    
            
            
                | 27 |  |  |     private $fallback; | 
            
                                                                        
                            
            
                                    
            
            
                | 28 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 29 |  |  |     /** | 
            
                                                                        
                            
            
                                    
            
            
                | 30 |  |  |      * @param ImageViewFactoryInterface $imageViewFactory | 
            
                                                                        
                            
            
                                    
            
            
                | 31 |  |  |      * @param ProductAttributeValueViewFactoryInterface $attributeValueViewFactory | 
            
                                                                        
                            
            
                                    
            
            
                | 32 |  |  |      * @param string $fallback | 
            
                                                                        
                            
            
                                    
            
            
                | 33 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 34 |  |  |     public function __construct( | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  |         ImageViewFactoryInterface $imageViewFactory, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 36 |  |  |         ProductAttributeValueViewFactoryInterface $attributeValueViewFactory, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  |         $fallback | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  |     ) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  |         $this->imageViewFactory = $imageViewFactory; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  |         $this->attributeValueViewFactory = $attributeValueViewFactory; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |         $this->fallback = $fallback; | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 42 |  |  |     } | 
            
                                                                        
                            
            
                                    
            
            
                | 43 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 44 |  |  |     /** | 
            
                                                                        
                            
            
                                    
            
            
                | 45 |  |  |      * {@inheritdoc} | 
            
                                                                        
                            
            
                                    
            
            
                | 46 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 47 |  |  |     public function create(ProductInterface $product, ChannelInterface $channel, $locale) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |         $productView = new ProductView(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 50 |  |  |         $productView->name = $product->getTranslation($locale)->getName(); | 
                            
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                | 51 |  |  |         $productView->code = $product->getCode(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |         $productView->slug = $product->getTranslation($locale)->getSlug(); | 
                            
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                | 53 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 54 |  |  |         /** @var ProductImageInterface $image */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 55 |  |  |         foreach ($product->getImages() as $image) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 56 |  |  |             $imageView = $this->imageViewFactory->create($image); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 57 |  |  |             $productView->images[] = $imageView; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 58 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 59 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 60 |  |  |         /** @var TaxonInterface $taxon */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 61 |  |  |         foreach ($product->getTaxons() as $taxon) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 62 |  |  |             $productView->taxons[] = $taxon->getCode(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 63 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 64 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 65 |  |  |         /** @var AttributeValueInterface $attribute */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 66 |  |  |         foreach ($product->getAttributesByLocale($locale, $this->fallback) as $attribute) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 67 |  |  |             $productView->attributes[] = $this->attributeValueViewFactory->create($attribute); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 68 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 69 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 70 |  |  |         return $productView; | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 71 |  |  |     } | 
            
                                                        
            
                                    
            
            
                | 72 |  |  | } | 
            
                                                        
            
                                    
            
            
                | 73 |  |  |  | 
            
                        
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: