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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Basis\Provider;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Basis\Service;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use League\Container\ServiceProvider\AbstractServiceProvider;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Tarantool\Client\Client;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Tarantool\Mapper\Mapper;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Tarantool\Mapper\Plugin\Sequence;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Tarantool\Mapper\Plugin\Spy;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Tarantool\Mapper\Plugin\Temporal;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Tarantool\Mapper\Pool;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class PoolProvider extends AbstractServiceProvider  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected $provides = [  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        Pool::class,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    ];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function register()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getContainer()->share(Pool::class, function () { | 
            
                            
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                            $pool = new Pool();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $container = $this->getContainer();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $pool->registerResolver(function ($name) use ($container) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if ($name == 'default' || $name == $container->get(Service::class)->getName()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $mapper = $container->get(Mapper::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $mapper->serviceName = $container->get(Service::class)->getName();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    return $mapper;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $service = $container->get(Service::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if (in_array($name, $service->listServices())) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $address = $service->getHost($name.'-db')->address;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $client = Client::fromDsn('tcp://'.$address.':3301'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $client->evaluate("box.session.su('admin')"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $mapper = new Mapper($client);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $mapper->getPlugin(Sequence::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $mapper->getPlugin(Spy::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $mapper->getPlugin(Temporal::class)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        ->getAggregator()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        ->setReferenceAggregation(false);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $mapper->serviceName = $name;  | 
            
                            
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                                    return $mapper;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            });  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $pool;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        });  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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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: