protected function createRules()
    {
        $rules = new Kdyby\Validation\EntityRules($this->identityRepository->getEntityManager());

        // .. 1
        $rules->require('username')->pass('IsUniqueInStorage')->pass('filled');

        // .. 2
        $rules->require('email', 'IsUniqueInStorage');

        // .. 3
        $rules['email']
            ->IsUniqueInStorage()
            ->Required()
            ->IsEmail();

        $rules['password']
            ->Required();

        // .. 4
        $rules
            ->IsUniqueInStorage('email')
            ->Required('email')
            ->IsEmail('email');

        // .. 5
        $rules
            ->email('IsUniqueInStorage')
            ->email('Required')
            ->email('IsEmail');

        // .. 5
        $rules
            ->email('IsUniqueInStorage', ~'IsEmpty', 'IsEmail');

        return $rules;
    }