How to restrinc user votes

Question

I implemented a vote system for my users on a forumbundle. It works fine but I would like to restrinct and just let vote 1 time for user. So I create a Boolean voted on my bdd. But I don't know how should I can avoid that user's can vote again but at the same time I'd like to let them undo the vote.

So I made this function :

 public function ScoreAction(Request $request){

    $em = $this->getDoctrine()->getManager();

    $idTopic = $request->request->get('id_topic');       

    $idPoster = $request->request->get('id_poster');

    $positive= $request->request->get('positive');
    $negative= $request->request->get('negatiu');

    $user=  $em->getRepository(User::class)->findOneById($idPoster); 

    $topic = $em->getRepository(Topic::class)->findOneById($idTopic); 


    $score= $user->getReputation();
    $voted = $user->getVoted();
    if ($positive!= null) {
        $score= $score+ 1;
        $voted = 1;
    }
    if($negative!= null){
         $score= $score- 1;
         $voted = 1;
    }

    $user->setReputation($score);
    $user->setVoted($voted);
    $em->persist($user);
    $em->flush();


    $redirect = $this->generateUrl('discutea_forum_post', array('slug' => $topic->getSlug())); 

    return $this->redirect($redirect);
}

Update with change boolean for int nullable on my Database and made this code:

     $score = $user->getReputation();
    $voted = $user->getVoted();

    if ($voted == null) {                  
        if ($positive != null) {
            $score = $score + 1;
            $voted = 1;
        }
        if($negative != null){
             $score = $score - 1;
             $voted = 0;
        }
    }else if($voted == 1){
        if ($negative != null) {
            $score = $score - 1;
            $voted = 0;
        }
    }else if($voted == 0){
        if ($positive != null) {
            $score = $score + 1;
            $voted = 1;
        }
    }


    $user->setReputation($score);
    $em->persist($user);
    $em->flush();

Answer 1

$voted = $user->getVoted();

if ($voted) {
    //just redirect somewhere else, without making an actual vote
} else {
    //do your vote stuff
    //persist and flush etc
    //redirect somewhere else
}

something along those lines ?

are you trying to achieve the following ?:

$voted = $user->getVoted();

if ($voted) {
    if ($positive!= null) {
        $user->setReputation($user->setReputation()+2);
    }
    if ($negative!= null){
         $user->setReputation($user->setReputation()-2);
    }
} else {
    if ($positive!= null) {
        $user->setReputation($user->setReputation()+1);
    }
    if ($negative!= null){
         $user->setReputation($user->setReputation()-1);
    }
}

EDIT:

try this

if ($voted === null) {                  
    if ($positive != null) {
        $score = $score + 1;
    }
    if($negative != null){
         $score = $score - 1;
    }
}else if($voted === 1){
    if ($negative != null) {
        $score = $score - 1;
    }
}else if($voted === 0){
    if ($positive != null) {
        $score = $score + 1;
    }
}