Selecting If One Row From Entity Exists in Symfony / Twig - symfony

Question

I am making a web app using Symfony 4.
The app has (among others) a User entity, Post entity, and a PostLike entity. A user can create many posts, and a post can have many likes. So PostLike references User and Post. Below is my PostLike entity:
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Mapping\Annotation as Gedmo;
/**
* #ORM\Entity(repositoryClass="App\Repository\PostLikeRepository")
*/
class PostLike
{
/**
* #ORM\Id()
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="App\Entity\User", inversedBy="postLikes")
* #ORM\JoinColumn(nullable=true)
*/
private $user;
/**
* #ORM\ManyToOne(targetEntity="App\Entity\Post", inversedBy="postLikes")
* #ORM\JoinColumn(nullable=true)
*/
private $post;
/**
* #Gedmo\Timestampable(on="create")
* #ORM\Column(type="datetime")
*/
private $createdAt;
/**
* #return mixed
*/
public function getId()
{
return $this->id;
}
/**
* #param mixed $id
*/
public function setId($id): void
{
$this->id = $id;
}
/**
* #return mixed
*/
public function getUser()
{
return $this->user;
}
/**
* #param mixed $user
*/
public function setUser($user): void
{
$this->user = $user;
}
/**
* #return mixed
*/
public function getPost()
{
return $this->post;
}
/**
* #param mixed $post
*/
public function setPost($post): void
{
$this->post = $post;
}
public function getCreatedAt()
{
return $this->createdAt;
}
}
When I am on the view page for an individual post, how would I reference whether a user has liked this post in TWIG? This will be the ‘many’ side of the relationship, but I just need one row (if it exists), and I’m not sure how to do this...
TIA.

Answer 1

In the controller you can check whether such PostLike with such user and post exist or not and pass it to the view:
$liked = false;
$postLike = $this->getDoctrine()->getManager()->getRepository('AppBundle:PostLike')->findOneBy(['user'=>$user->getId(),'post'=>$post->getId()]);
if($postLike !== null){
$liked = true;
}

Answer 2

If you want to simply show whether Likes exist you can add a field to the Post entity:
public function hasLikes()
{
return (0 === count($this->likes)) ? false : true;
}
and include in twig something like {% if post.hasLikes %}Liked{% endif %}.
You could do something similar with a count and a badge to show the number of likes.