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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This file is part of the Sonata Project package.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * (c) Thomas Rabaix <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * For the full copyright and license information, please view the LICENSE  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * file that was distributed with this source code.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Sonata\DoctrinePHPCRAdminBundle\Tests\Fixtures\App\DataFixtures\Phpcr;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\Common\DataFixtures\FixtureInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\Common\Persistence\ObjectManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use PHPCR\Util\NodeHelper;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Sonata\DoctrinePHPCRAdminBundle\Tests\Fixtures\App\Document\Content;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class LoadTreeData implements FixtureInterface  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function load(ObjectManager $manager): void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        NodeHelper::createPath($manager->getPhpcrSession(), '/test');  | 
            
                            
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                        NodeHelper::createPath($manager->getPhpcrSession(), '/test/content');  | 
            
                            
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                        NodeHelper::createPath($manager->getPhpcrSession(), '/test/routes');  | 
            
                            
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                        $contentRoot = $manager->find(null, '/test/content');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $routeRoot = $manager->find(null, '/test/routes');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $singleRoute = new Content();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $singleRoute->setName('route-1'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $singleRoute->setTitle('Route 1'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $singleRoute->setParentDocument($routeRoot);  | 
            
                            
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                        $manager->persist($singleRoute);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $routeAlikeA = new Content();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $routeAlikeA->setName('route-2'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $routeAlikeA->setTitle('Route 2'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $routeAlikeA->setParentDocument($routeRoot);  | 
            
                            
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                        $manager->persist($routeAlikeA);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $routeAlikeB = new Content();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $routeAlikeB->setName('route-3'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $routeAlikeB->setTitle('Route 3'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $routeAlikeB->setParentDocument($routeRoot);  | 
            
                            
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                        $manager->persist($routeAlikeB);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $child = new Content();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $child->setName('child'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $child->setTitle('Content Child'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content = new Content();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content->setName('content-1'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content->setTitle('Content 1'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content->setSingleRoute($singleRoute);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content->addRoute($routeAlikeA);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content->addRoute($routeAlikeB);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content->setChild($child);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content->setParentDocument($contentRoot);  | 
            
                            
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                        $manager->persist($content);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $childA = new Content();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $childA->setName('content-3'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $childA->setTitle('Content Child A'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $childB = new Content();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $childB->setName('content-3'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $childB->setTitle('Content Child B'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content = new Content();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content->setName('content-2'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content->setParentDocument($contentRoot);  | 
            
                            
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                        $content->addChild($childA);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content->addChild($childB);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $content->setTitle('Content 2'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $manager->persist($content);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $manager->flush();  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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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: