Symfony 4 : doctrine, relationships and twig - doctrine

Question

I'm currently working on my first symfony 4 project and I'm having a problem with my twig templating.
First of all here is a UML diagram of my created objects.
And my layout should look sorta like this :
Here are my entities :
Region
<?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\RegionRepository")
*/
class Region
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $designation;
/**
* #ORM\OneToMany(targetEntity="App\Entity\Country", mappedBy="region", orphanRemoval=true)
*/
private $countries;
/**
* #ORM\Column(type="string", length=255)
*/
private $initials;
public function __construct()
{
$this->countries = new ArrayCollection();
}
public function getId()
{
return $this->id;
}
public function getDesignation(): ?string
{
return $this->designation;
}
public function setDesignation(string $designation): self
{
$this->designation = $designation;
return $this;
}
/**
* #return Collection|Country[]
*/
public function getCountries(): Collection
{
return $this->countries;
}
public function addCountry(Country $country): self
{
if (!$this->countries->contains($country)) {
$this->countries[] = $country;
$country->setRegion($this);
}
return $this;
}
public function removeCountry(Country $country): self
{
if ($this->countries->contains($country)) {
$this->countries->removeElement($country);
// set the owning side to null (unless already changed)
if ($country->getRegion() === $this) {
$country->setRegion(null);
}
}
return $this;
}
public function getInitials(): ?string
{
return $this->initials;
}
public function setInitials(string $initials): self
{
$this->initials = $initials;
return $this;
}
public function __toString()
{
return $this->getInitials();
}
}
Continent
<?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\ContinentRepository")
*/
class Continent
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $name;
/**
* #ORM\Column(type="string", length=255)
*/
private $code;
/**
* #ORM\OneToMany(targetEntity="App\Entity\Country", mappedBy="continent", orphanRemoval=true)
*/
private $countries;
public function __construct()
{
$this->countries = new ArrayCollection();
}
public function getId()
{
return $this->id;
}
public function getName(): ?string
{
return $this->name;
}
public function setName(string $name): self
{
$this->name = $name;
return $this;
}
public function getCode(): ?string
{
return $this->code;
}
public function setCode(string $code): self
{
$this->code = $code;
return $this;
}
/**
* #return Collection|Country[]
*/
public function getCountries(): Collection
{
return $this->countries;
}
public function addCountry(Country $country): self
{
if (!$this->countries->contains($country)) {
$this->countries[] = $country;
$country->setContinent($this);
}
return $this;
}
public function removeCountry(Country $country): self
{
if ($this->countries->contains($country)) {
$this->countries->removeElement($country);
// set the owning side to null (unless already changed)
if ($country->getContinent() === $this) {
$country->setContinent(null);
}
}
return $this;
}
public function __toString()
{
return $this->getName();
}
}
Country
<?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\CountryRepository")
*/
class Country
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $name;
/**
* #ORM\Column(type="string", length=255)
*/
private $iso;
/**
* #ORM\ManyToOne(targetEntity="App\Entity\Region", inversedBy="countries")
* #ORM\JoinColumn(name="region_id", referencedColumnName="id")
*/
private $region;
/**
* #ORM\OneToMany(targetEntity="App\Entity\Document", mappedBy="country", orphanRemoval=true)
*/
private $documents;
/**
* #ORM\ManyToOne(targetEntity="App\Entity\Continent", inversedBy="countries")
* #ORM\JoinColumn(name="continent_id", referencedColumnName="id")
*/
private $continent;
public function __construct()
{
$this->documents = new ArrayCollection();
}
public function getId()
{
return $this->id;
}
public function getName(): ?string
{
return $this->name;
}
public function setName(string $name): self
{
$this->name = $name;
return $this;
}
public function getIso(): ?string
{
return $this->iso;
}
public function setIso(string $iso): self
{
$this->iso = $iso;
return $this;
}
public function getRegion(): ?Region
{
return $this->region;
}
public function setRegion(?Region $region): self
{
$this->region = $region;
return $this;
}
/**
* #return Collection|Document[]
*/
public function getDocuments(): Collection
{
return $this->documents;
}
public function addDocument(Document $document): self
{
if (!$this->documents->contains($document)) {
$this->documents[] = $document;
$document->setCountry($this);
}
return $this;
}
public function removeDocument(Document $document): self
{
if ($this->documents->contains($document)) {
$this->documents->removeElement($document);
// set the owning side to null (unless already changed)
if ($document->getCountry() === $this) {
$document->setCountry(null);
}
}
return $this;
}
public function getContinent(): ?Continent
{
return $this->continent;
}
public function setContinent(?Continent $continent): self
{
$this->continent = $continent;
return $this;
}
}
Document
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
use Vich\UploaderBundle\Mapping\Annotation as Vich;
use Symfony\Component\HttpFoundation\File\File;
/**
* #ORM\Entity(repositoryClass="App\Repository\DocumentRepository")
* #Vich\Uploadable()
*/
class Document
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="App\Entity\Country", inversedBy="documents")
* #ORM\JoinColumn(name="country_id", referencedColumnName="id")
*/
private $country;
/**
* #ORM\Column(type="string")
*/
private $level;
/**
* NOTE: This is not a mapped field of entity metadata, just a simple property.
*
* #Vich\UploadableField(mapping="country_document", fileNameProperty="documentName", size="documentSize")
*
* #var File
*/
private $documentFile;
/**
* #ORM\Column(type="string", length=255)
*
* #var string
*/
private $documentName;
/**
* #ORM\Column(type="integer")
*
* #var integer
*/
private $documentSize;
/**
* #ORM\Column(type="datetime")
*
* #var \DateTime
*/
private $updatedAt;
public function getId()
{
return $this->id;
}
public function getCountry(): ?Country
{
return $this->country;
}
public function setCountry(?Country $country): self
{
$this->country = $country;
return $this;
}
public function getLevel(): ?int
{
return $this->level;
}
public function setLevel(int $level): self
{
$this->level = $level;
return $this;
}
public function setDocumentFile(?File $document = null): void
{
$this->documentFile = $document;
if (null !== $document) {
// It is required that at least one field changes if you are using doctrine
// otherwise the event listeners won't be called and the file is lost
$this->updatedAt = new \DateTimeImmutable();
}
}
public function getDocumentFile(): ?File
{
return $this->documentFile;
}
public function setDocumentName(?string $documentName): void
{
$this->documentName = $documentName;
}
public function getDocumentName(): ?string
{
return $this->documentName;
}
public function setDocumentSize(?int $documentSize): void
{
$this->documentSize = $documentSize;
}
public function getDocumentSize(): ?int
{
return $this->documentSize;
}
}
I have 4 regions. These regions each have multiple countries who are affiliated to a continent and have 2 documents attributed to them.
How should I proceed to get the layout I want ?