Validate the combination of 2 filed in same Entity - symfony

Question

I have an entity called Note , for every Note ther's etudiant_id and evaluation_id .
I want that the combination of etudiant_id and evaluation_id should be unique .
For exmple when i give him a Note object1(etudiant_id=1,evaluation_id=1) and Note2 object2(etudiant_id=1,evaluation_id=1) : this should throw an exception. but
in case of :
Note object1(etudiant_id=1,evaluation_id=2) and Note2 object2(etudiant_id=1,evaluation_id=1) : this will not throw anything .
By the way i tried :* #UniqueEntity(fields={"evaluation","etudiant"}) but this didnt work correcte.
Here's my Note Entity :
<?php
namespace EcoleBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
/**
* Note
* #ORM\Entity
* #UniqueEntity(fields={"evaluation","etudiant"})
* #ORM\Table(name="note")
* #ORM\Entity(repositoryClass="EcoleBundle\Repository\NoteRepository")
*/
class Note
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var float
*
* #ORM\Column(name="valeur", type="float", nullable=true)
*/
private $valeur;
/**
* #ORM\ManyToOne(targetEntity="EcoleBundle\Entity\Evaluation", inversedBy="notes")
*/
private $evaluation;
/**
* #ORM\ManyToOne(targetEntity="EcoleBundle\Entity\Etudiant", inversedBy="notes")
*/
private $etudiant;

Answer 1

You should have only one #Entity annotation. Try to substitute with this and clean the cache
/**
* Note
* #ORM\Entity(repositoryClass="EcoleBundle\Repository\NoteRepository")
* #UniqueEntity(fields={"evaluation","etudiant"})
* #ORM\Table(name="note")
*/