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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This file is part of the CCDNForum ForumBundle  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * (c) CCDN (c) CodeConsortium <http://www.codeconsortium.com/>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Available on github <http://www.github.com/codeconsortium/>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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 CCDNForum\ForumBundle\Model\FrontModel;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Security\Core\User\UserInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use CCDNForum\ForumBundle\Model\FrontModel\BaseModel;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use CCDNForum\ForumBundle\Model\FrontModel\ModelInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use CCDNForum\ForumBundle\Entity\Registry;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @category CCDNForum  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package  ForumBundle  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author   Reece Fowell <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license  http://opensource.org/licenses/MIT MIT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @version  Release: 2.0  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link     https://github.com/codeconsortium/CCDNForumForumBundle  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class RegistryModel extends BaseModel implements ModelInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @access public  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  \Symfony\Component\Security\Core\User\UserInterface $user  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \CCDNForum\ForumBundle\Entity\Registry  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function findOrCreateOneRegistryForUser(UserInterface $user)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $registry = $this->findOneRegistryForUserById($user->getId());  | 
            
                            
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                        if (! $registry) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $registry = $this->createRegistry();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $registry->setOwnedBy($user);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->saveRegistry($registry);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $registry;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @access public  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  int                                    $userId  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \CCDNForum\ForumBundle\Entity\Registry  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function findOneRegistryForUserById($userId)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->getRepository()->findOneRegistryForUserById($userId);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @access public  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \CCDNForum\ForumBundle\Entity\Registry  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function createRegistry()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $this->getManager()->createRegistry();  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @access public  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  \CCDNForum\ForumBundle\Entity\Registry                $registryModel  | 
            
                            
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                     * @return \CCDNForum\ForumBundle\Model\FrontModel\RegistryModel  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function saveRegistry(Registry $registry)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getManager()->saveRegistry($registry);  | 
            
                            
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                        return $this;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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: