Get related objects data - php

Question

I have two entities, Classe and students, the class has a OneToMany relation with Student as one class can have many students.
I'm creating a page where I show the names of all the students related to a chosen classes and I can't access the data in students from Classe.
entity class
<?php
namespace App\Entity;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass="App\Repository\ClasseRepository")
*/
class Classe
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=200)
*/
private $label;
/**
* #ORM\OneToMany(targetEntity="App\Entity\Student", mappedBy="classe", orphanRemoval=true)
*/
private $Students;
/**
* #ORM\OneToMany(targetEntity="App\Entity\WorkDays", mappedBy="class")
*/
private $schedule;
public function __construct()
{
$this->Students = new ArrayCollection();
$this->schedule = new ArrayCollection();
}
public function getId(): ?int
{
return $this->id;
}
public function getLabel(): ?string
{
return $this->label;
}
public function setLabel(string $label): self
{
$this->label = $label;
return $this;
}
/**
* #return Collection|Student[]
*/
public function getStudents(): Collection
{
return $this->Students;
}
public function addStudent(Student $student): self
{
if (!$this->Students->contains($student)) {
$this->Students[] = $student;
$student->setClasse($this);
}
return $this;
}
public function removeStudent(Student $student): self
{
if ($this->Students->contains($student)) {
$this->Students->removeElement($student);
// set the owning side to null (unless already changed)
if ($student->getClasse() === $this) {
$student->setClasse(null);
}
}
return $this;
}
/**
* #return Collection|WorkDays[]
*/
public function getSchedule(): Collection
{
return $this->schedule;
}
public function addSchedule(WorkDays $schedule): self
{
if (!$this->schedule->contains($schedule)) {
$this->schedule[] = $schedule;
$schedule->setClass($this);
}
return $this;
}
public function removeSchedule(WorkDays $schedule): self
{
if ($this->schedule->contains($schedule)) {
$this->schedule->removeElement($schedule);
// set the owning side to null (unless already changed)
if ($schedule->getClass() === $this) {
$schedule->setClass(null);
}
}
return $this;
}
}
Entity Student
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass="App\Repository\StudentRepository")
*/
class Student
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=200)
*/
private $firstname;
/**
* #ORM\Column(type="string", length=200)
*/
private $lastname;
/**
* #ORM\ManyToOne(targetEntity="App\Entity\classe", inversedBy="Students")
* #ORM\JoinColumn(nullable=false)
*/
private $classe;
public function getId(): ?int
{
return $this->id;
}
public function getFirstname(): ?string
{
return $this->firstname;
}
public function setFirstname(string $firstname): self
{
$this->firstname = $firstname;
return $this;
}
public function getLastname(): ?string
{
return $this->lastname;
}
public function setLastname(string $lastname): self
{
$this->lastname = $lastname;
return $this;
}
public function getClasse(): ?classe
{
return $this->classe;
}
public function setClasse(?classe $classe): self
{
$this->classe = $classe;
return $this;
}
}
As I said before, a class can have many students and I need to get the names of the students that a related to that class and put them in a list.

Answer 1

Because the entities are related to eachother you can access the student info of a class through the Entity Classe or the other way arround. For example:
Controller:
namespace App\Controller;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
class ClasseController extends AbstractController {
/**
* #Route("/{id}", name="index", methods={"GET"})
*/
public function index(ClasseRepository $repository, $id) {
return $this->render('index.html.twig', [
'students' => $repository->getStudents($id),
]);
}
Repository:
namespace App\Repository;
use App\Entity\Classe;
use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
use Symfony\Bridge\Doctrine\RegistryInterface;
class ClasseRepository extends ServiceEntityRepository
{
public function __construct(RegistryInterface $registry)
{
parent::__construct($registry, Classe::class);
}
public function getStudents($id) {
return $this->createQueryBuilder('c')
->select('c.Students')
->andWhere('c.id = :id')
->setParameter('id', $id)
->getQuery()
->getResult()
;
}
}