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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Halapi\ObjectManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\Common\Persistence\ObjectManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Interface ObjectManagerInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Romain Richard  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                class DoctrineOrmObjectManager implements ObjectManagerInterface  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @var ObjectManager  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private $objectManager;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * DoctrineOrmObjectManager constructor.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param ObjectManager $objectManager  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(ObjectManager $objectManager)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->objectManager = $objectManager;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param object $resource  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return mixed  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getIdentifierName($resource)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $classMetadata = $this->objectManager->getClassMetadata(get_class($resource));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $classMetadata->getIdentifier()[0];  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param object $resource  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return mixed  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getIdentifier($resource)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $identifier = new \ReflectionProperty($resource, $this->getIdentifier($resource));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($identifier->isPublic()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $identifier;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $getter = 'get'.ucfirst($identifier);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $getterReflection = new \ReflectionMethod($resource, $getter);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (method_exists($resource, $getter) && $getterReflection->isPublic()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $resource->$getter();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param string $className  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return \Doctrine\Common\Persistence\Mapping\ClassMetadata  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getClassMetadata($className)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->objectManager->getClassMetadata($className);  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param string $className  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param array  $sorting  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param array  $filterValues  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param array  $filerOperators  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function findAllSorted($className, array $sorting, array $filterValues, array $filerOperators)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fields = array_keys($this->getClassMetadata($className)->fieldMappings);  | 
            
                            
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                        $repository = $this->objectManager->getRepository($className);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // If user's own implementation is defined, use it  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (is_callable(array($repository, 'findAllSorted'))) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $repository->findAllSorted($className, $sorting, $filterValues, $filerOperators);  | 
            
                            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $queryBuilder = $repository->createQueryBuilder('e'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($fields as $field) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (isset($sorting[$field])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $direction = ($sorting[$field] === 'asc') ? 'asc' : 'desc';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $queryBuilder->addOrderBy('e.'.$field, $direction); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (isset($filterValues[$field])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $operator = '=';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if (isset($filerOperators[$field])  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    && in_array($filerOperators[$field], ['>', '<', '>=', '<=', '=', '!='])  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $operator = $filerOperators[$field];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $queryBuilder->andWhere('e.'.$field.$operator."'".$filterValues[$field]."'"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return [$queryBuilder];  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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If you access a property on an interface, you most likely code against a concrete implementation of the interface.
Available Fixes
Adding an additional type check:
Changing the type hint: