public function getInputFilterSpecification()
    {
        return array(
            'fsOne' => array(
                'spec' => array(
                    'email' => array(
                        'validators' => array(
                            array(
                                'name' => 'DoctrineModule\Validator\NoObjectExists',
                                'options' => array(
                                    'object_repository' => $this->repository,
                                    'fields' => 'email',
                                ),
                                'messages' => array(
                                    'objectFound' => 'Sorry guy, a user with this email already exists !'
                                )
                            )
                        )
                    )
                )
            )
        );
    }