Nested jointable joincolumns in symfony 2 with doctrine 2 - php

Question

So given the entity Comment, what is the cleanest way to get the CommentPerson to find out if the CommentPerson isModerator()?
Without getting your fingers dirty using a repository.
/**
* #ORM\Entity(repositoryClass="MyApp\MyBundle\Repository\CommentRepository")
* #ORM\Table(name="comment")
*/
class Comment
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\Column(type="integer")
*/
protected $user_id; //id of entity User
/**
* #ORM\ManyToOne(targetEntity="User")
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
**/
protected $user; //a user can have many comments
/**
* #ORM\Column(type="text")
*/
protected $commentText;
}
/**
* #ORM\Entity(repositoryClass="MyApp\MyBundle\Repository\UserRepository")
* #ORM\Table(name="user")
*/
class User //this is the web user
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\Column(type="integer")
*/
protected $person_id; //id of entity Person
/**
* #ORM\ManyToOne(targetEntity="Person")
* #ORM\JoinColumn(name="person_id", referencedColumnName="id")
**/
protected $person; //many web users can map to one actual person
public function getPerson()
{
return $this->person;
}
}
/**
* #ORM\Entity(repositoryClass="MyApp\MyBundle\Repository\PersonRepository")
* #ORM\Table(name="person")
*/
class Person
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\Column(type="text")
*/
protected $email;
/**
* #ORM\OneToMany(targetEntity="CommentPerson", mappedBy="person")
* #ORM\JoinColumn(name="id", referencedColumnName="person_id")
*/
private $commentPersons; //one person can have many commentPersons (since one person can be part in many different comment sections, not shown in code here, but take it as a fact)
}
/**
* #ORM\Entity(repositoryClass="MyApp\MyBundle\Repository\CommentPersonRepository")
* #ORM\Table(name="comment_Person")
*/
class CommentPerson
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\Column(type="integer")
*/
protected $person_id; //this is the id of the entity Person
/**
* #ORM\Column(type="boolean")
*/
protected $isModerator;
}