protected function useRelationInterfaceInEntityInterface(string $classPath, string $interfacePath): void
    {
        $entityFqn           = PhpClass::fromFile($classPath)->getQualifiedName();
        $entityInterfaceFqn  = $this->namespaceHelper->getEntityInterfaceFromEntityFqn($entityFqn);
        $entityInterfacePath = (new \ts\Reflection\ReflectionClass($entityInterfaceFqn))->getFileName();
        $entityInterface     = PhpInterface::fromFile($entityInterfacePath);
        $relationInterface   = PhpInterface::fromFile($interfacePath);
        $entityInterface->addInterface($relationInterface);
        $this->codeHelper->generate($entityInterface, $entityInterfacePath);
    }