Applicant.php

/**
 * @ORM\Entity(repositoryClass="ApplicantRepository")
 */
class Applicant extends BaseEntity
{
    /** @var string
    @ORM\Column(type="string") @ORM\Id*/
    protected $email;

    /**
     * @ORM\OneToMany(targetEntity="Comment", mappedBy="applicant")
     */
    protected $comments;
    /**
     * @ORM\OneToMany(targetEntity="Payment", mappedBy="applicant")
     */
    protected $payments;


}

ApplicantQuery.php

 public function listOfApplicants()
    {
        $qb = $this->applicantRepository->createQueryBuilder()
            ->select('a')
            ->from('\App\model\entity\Applicant','a')
            ->getQuery();
        return $qb->execute();
    }

Comment.php

class Comment extends BaseEntity
{
    /**
     * @var Applicant
     * @ORM\ManyToOne(targetEntity="Applicant", inversedBy="comments")
     * @ORM\JoinColumn(name="applicant_email", referencedColumnName="email")
     */
    protected $applicant;
}

Payment.php

class Payment extends BaseEntity
{

    /**
     * @var Applicant
     * @ORM\ManyToOne(targetEntity="Applicant", inversedBy="payments")
     * @ORM\JoinColumn(name="applicant_email", referencedColumnName="email")
     */
    protected $applicant;

} 

template.latte

<tbody>
  <tr n:foreach="$applicants as $applicant">
    <td>
      <a>komentář {$applicant->comments->count()}</a>
    </td>
    <td>
      <a>platba {$applicant->payments->count()}</a>
    </td>
  </tr>
</tbody>

////////////////////////////////////
$applicant->comments->count()

Call to a member function count() on a non-object