Relation between entity doctrine. How to references "foreign key"? - postgresql

Question

I'm currently working with Symfony and Doctrine and I'm having a little bit of trouble to reference two entity.
I have a entity called cinema and another one called theater. It's a relation of OneToMany, where one cinema can have many theater.
I create a cinema_id into theater so I can relate cinema and theater.
I have create a controller to consume data from an API and store the data into a Postgres database. Here is the controller:
TheaterController
namespace App\Controller;
use GuzzleHttp\Client;
use App\Entity\Cinema;
use App\Entity\Theater;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Routing\Annotation\Route;
class TheaterController extends AbstractController
{
/**
* #Route("/theater", name="theater")
*/
public function Theater(Request $request)
{
$client = new Client();
$res = $client->request('GET','api-content');
$arrayContent = json_decode($res->getBody());
foreach ($arrayContent as $value)
{
$entityManager = $this->getDoctrine()->getManager();
$theater_cinema_id = $entityManager->getReference(Cinema::Cinema, $id);
$theater->addId($theater_cinema_id);
$theater_booking_cinema = 'value';
$theater_booking_id = $value->id;
$theater = new theater();
$theater->setId($theater_cinema_id);
$theater->setBookingCinema($theater_booking_cinema);
$theater->setBookingId($theater_booking_id);
//echo $theater;
$entityManager->persist($theater);
$entityManager->flush();
}
}
}
My problem here is, how can I reference the id from cinema to the cinema_id from theater? What am I doing wrong?
The two entities are:
Cinema
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass="App\Repository\CinemaRepository")
*/
class Cinema
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $name;
/**
* #ORM\Column(type="integer")
*/
private $is_active;
/**
* #ORM\Column(type="datetime")
*/
private $created_at;
/**
* #ORM\Column(type="datetime")
*/
private $updated_at;
public function getId(): ?int
{
return $this->id;
}
public function getName(): ?string
{
return $this->name;
}
public function setName(string $name): self
{
$this->name = $name;
return $this;
}
public function getIsActive(): ?int
{
return $this->is_active;
}
public function setIsActive(int $is_active): self
{
$this->is_active = $is_active;
return $this;
}
public function getCreatedAt(): ?\DateTimeInterface
{
return $this->created_at;
}
public function setCreatedAt(\DateTimeInterface $created_at): self
{
$this->created_at = $created_at;
return $this;
}
public function getUpdatedAt(): ?\DateTimeInterface
{
return $this->updated_at;
}
public function setUpdatedAt(\DateTimeInterface $updated_at): self
{
$this->updated_at = $updated_at;
return $this;
}
}
Theater
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass="App\Repository\TheaterRepository")
*/
class Theater
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="App\Entity\Cinema")
* #ORM\JoinColumn(nullable=false)
*/
private $cinema;
/**
* #ORM\Column(type="string", length=255)
*/
private $booking_cinema;
/**
* #ORM\Column(type="integer")
*/
private $booking_id;
public function getId(): ?int
{
return $this->id;
}
public function getCinema(): ?cinema
{
return $this->cinema;
}
public function setCinema(?cinema $cinema): self
{
$this->cinema = $cinema;
return $this;
}
public function getBookingCinema(): ?string
{
return $this->booking_cinema;
}
public function setBookingCinema(string $booking_cinema): self
{
$this->booking_cinema = $booking_cinema;
return $this;
}
public function getBookingId(): ?int
{
return $this->booking_id;
}
public function setBookingId(int $booking_id): self
{
$this->booking_id = $booking_id;
return $this;
}
}

Answer 1

As I understood, you have many cinemas in one theater. So, you have add the following code to your Theater entity:
// ...
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;
// ...
/**
* #var ArrayCollection $cinemas
* #ORM\OneToMany(targetEntity="App\Entity\Theater", mappedBy="theater")
*/
public $cinemas;
// ...
/**
* Theater constructor.
*/
public function __construct()
{
$this->cinemas = new ArrayCollection();
}
// ...
/**
* #return array
*/
public function getCinemas(): array
{
return $this->cinemas->toArray()
}
/**
* #return Theater
*/
public function addCinema(Cinema $cinema): self
{
$this->cinemas->add($cinema);
return $this;
}
// ...
And the following code to your Cinema entity:
// ...
use Doctrine\ORM\Mapping as ORM;
// ...
/**
* #ORM\ManyToOne(targetEntity="App\Entity\Theater", inversedBy="cinemas")
* #ORM\JoinColumn(name="theater_id", referencedColumnName="id", nullable=FALSE)
*/
private $theater;
// ...
Then you can access to your cinemas entities from Theater entity:
$theaterRepository = $this->getDoctrine()->getManager()->getRepository(Theater::class);
$theater = $theaterRepository->findBy(['id' => 1]);
$cinemas = $theater->getCinemas(); // array
/** #var Cinema $cinema */
foreach($cinemas as $cinema) {
// ...
}
Or add new Cinema to your Theater:
$theaterRepository = $this->getDoctrine()->getManager()->getRepository(Theater::class);
$theater = $theaterRepository->findBy(['id' => 1]);
$cinema = new Cinema();
// ...
$theater->addCinema($cinema)
// Persist, flush, e.t.c
About the ArrayCollection you can read here
And you can access to your Theater entity from any Cinema entity:
$cinemaRepository = $this->getDoctrine()->getManager()->getRepository(Cinema::class);
$cinema = $cinemaRepository->findBy(['id' => 1]);
$theater = $cinema->getTheater(); // Theater object
Or add the Theater to your Cinema:
$cinema = new Cinema();
$theater = new Theater();
// ...
$cinema->setTheater($theater);
// ...
// Persist, flush, e.t.c

Answer 2

Doctrine is an ORM, which means you don't have to think about tables, but entities. You don't think about foreign keys, but relations between entities.
Your API is giving you the cinema ID, or you can access it another way? You can retrieve the cinema using this :
$cinema = $entityManager->getRepository('App:Cinema')->findOneById($cinema_id);
You want to tell what cinema the theater belongs to? Use this :
$theater->setCinema($cinema);
Doctrine will itself build and execute the queries to get the desired datas.