Symfony join query with One-To-Many relation - symfony

Question

I am quite new to symfony as in DQL. I have a problem with query, namely I want to compare the ID's between 'term_id' from table 'TermAssign' with 'id' from table Term and then, the one's who are matching are to be rendered on a template. Relation between Term and TermAssign is OneToMany. There is also a table Offer, which has relation OneToMany with table TermAssign.
This is my Term.php:
<?php
namespace App\OfferBundle\Entity;
use App\OfferBundle\Repository\TermRepository;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass=TermRepository::class)
* #ORM\Table(name="term")
*/
class Term
{
/**
* #ORM\Id
* #ORM\GeneratedValue
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=255, nullable=true, name="term_description")
*/
private $term_description;
/**
* #ORM\OneToMany(targetEntity=TermAssign::class, mappedBy="term")
*/
private $assign;
public function __construct()
{
$this->assign = new ArrayCollection();
}
function getId(): ?int
{
return $this->id;
}
public function getTermDescription(): ?string
{
return $this->term_description;
}
public function setTermDescription(?string $term_description): self
{
$this->term_description = $term_description;
return $this;
}
/**
* #return Collection|TermAssign[]
*/
public function getAssign(): Collection
{
return $this->assign;
}
public function addAssign(TermAssign $assign): self
{
if (!$this->assign->contains($assign)) {
$this->assign[] = $assign;
$assign->setTerm($this);
}
return $this;
}
public function removeAssign(TermAssign $assign): self
{
if ($this->assign->removeElement($assign)) {
// set the owning side to null (unless already changed)
if ($assign->getTerm() === $this) {
$assign->setTerm(null);
}
}
return $this;
}
}
This is Offer.php:
<?php
namespace App\OfferBundle\Entity;
use App\OfferBundle\Repository\OfferRepository;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints\DateTime;
/**
* #ORM\Entity(repositoryClass=OfferRepository::class)
*/
class Offer
{
/**
* #ORM\Id
* #ORM\GeneratedValue
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string")
*/
private $title;
/**
* #ORM\Column(type="date", name="offer_date")
*/
private $date;
/**
* #ORM\Column(type="string", unique=true)
*/
private $number;
/**
* #ORM\Column(type="string")
*/
private $description;
/**
* #ORM\OneToMany(targetEntity=TermAssign::class, mappedBy="offer")
*/
private $terms;
public function __construct()
{
$this->terms = new ArrayCollection();
}
/**
* Getting offer's id
*/
public function getId(): ?int
{
return $this->id;
}
/**
* getting offer's Title
*/
public function getTitle(): string
{
return $this->title;
}
/**
* Setting offer's name
*/
public function setTitle($title): self
{
$this->title = $title;
return $this;
}
/**
* getting offer's date
*/
public function getDate(): ?\DateTime
{
return $this->date;
}
/**
* Setting offer's date
*/
public function setDate($date): self
{
$this->date = $date;
return $this;
}
/**
* Offer's number
*/
public function getNumber() : string
{
return $this->number;
}
/**
* Setting offer's number
*/
public function setNumber($number): self
{
$this->number = $number;
return $this;
}
/**
* Offer's description
*/
public function getDescription()
{
return $this->description;
}
/**
* Setting offer's description
*/
public function setDescription($description): void
{
$this->description = $description;
}
/**
* #return Collection|TermAssign[]
*/
public function getTerms(): Collection
{
return $this->terms;
}
public function addTerm(TermAssign $term): self
{
if (!$this->terms->contains($term)) {
$this->terms[] = $term;
$term->setOffer($this);
}
return $this;
}
public function removeTerm(TermAssign $term): self
{
if ($this->terms->removeElement($term)) {
// set the owning side to null (unless already changed)
if ($term->getOffer() === $this) {
$term->setOffer(null);
}
}
return $this;
}
}
And this is TermAssign.php:
<?php
namespace App\OfferBundle\Entity;
use App\OfferBundle\Repository\TermAssignRepository;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass=TermAssignRepository::class)
*/
class TermAssign
{
/**
* #ORM\Id
* #ORM\GeneratedValue
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity=Offer::class, inversedBy="terms")
*/
private $offer;
/**
* #ORM\ManyToOne(targetEntity=Term::class, inversedBy="assign")
*/
private $term;
public function getId(): ?int
{
return $this->id;
}
public function getOffer(): ?Offer
{
return $this->offer;
}
public function setOffer(?Offer $offer): self
{
$this->offer = $offer;
return $this;
}
public function getTerm(): ?Term
{
return $this->term;
}
public function setTerm(?Term $term): self
{
$this->term = $term;
return $this;
}
}
I did came up with query of this sort:
/**
* #return Term[] Returns an array of Term objects
*/
public function findByIdField():array
{
$em = $this->getEntityManager();
$query = $em->createQuery("SELECT t, a FROM App\OfferBundle\Entity\Term t JOIN t.term a WHERE a.term_id = t.id");
return $query->getResult();
}
But it's of no use.
Also, this is part of my controller where I invoke query to be passed into the template:
OfferController.php
/**
* #Route("/{id}", name="offer_show", methods={"GET"})
*/
public function show(Offer $offer, int $id): Response
{
$termAssigns = $this->getDoctrine()
->getRepository(TermAssign::class)
->findBy(
['offer'=>$id]
);
$terms = $this->getDoctrine()
->getRepository(Term::class)
->findByIdField();
$conditions = $this->getDoctrine()
->getRepository(Condition::class)
->findAll();
return $this->render('offer/show.html.twig', [
'offer' => $offer,
'terms'=> $terms,
'conditions'=>$conditions,
'termAssigns'=>$termAssigns,
]);
}
The question is, what can I do to achieve something like
SELECT description FROM Term.t where 't.id'='ta.term_id'
'ta' is TermAssign table.

Answer 1

That was WAY much less complicated than I have imagined... I didn't have to create a new query, all I had to do was to import a TermAssign repository to show() function located in OfferController.php and use findBy() function to fetch terms from Term table. Solution below:
OfferController.php:
/**
* #Route("/{id}", name="offer_show", methods={"GET"})
*/
public function show(Offer $offer, int $id, TermAssign $terms): Response
{
**$termAssigns = $this->getDoctrine()
->getRepository(TermAssign::class)
->findBy(
['offer'=>$id]
);
$terms = $this->getDoctrine()
->getRepository(Term::class)
->findBy(
['id'=>$terms->getId()]
);**
$conditions = $this->getDoctrine()
->getRepository(Condition::class)
->findAll();
return $this->render('offer/show.html.twig', [
'offer' => $offer,
'terms'=> $terms,
'conditions'=>$conditions,
'termAssigns'=>$termAssigns,
]);
}