Symfony Doctrine Relationships between 3 Tables - php

Question

I am new with Symfony. I am working with version 3. I simplified my example. I have 3 Tables, for this tables I created a class for each one.
Table "Person": id | name
Table "Group": id | groupname
Table "PersonGroup": id | person | group
Every Person could be in several groups and every groups can have several persons. In the table PersonGroup I connect the persons with the groups. In my Controller I want to request in which group the selected person is. But in the Dump I only have the data from the PersonGroup table and not the details from the Group (in this example the name):
PersonGroup {#485 ▼
-id: 5
-person: Person {#456 ▼
-id: 4
-name: "Adam"
-personGroups: PersistentCollection {#445 ▶}
}
-group: Group {#486 ▼
+__isInitialized__: false
-id: 5
-name: null
-personGroups: null
…2
}
}
My Controller:
/**
* #Route("/person/{personId}", name="personController")
*/
public function showAction($personId)
{
$em = $this->getDoctrine()->getManager();
$item = $em->getRepository('AppBundle:Person')
->findOneBy(['id' => $personId]);
foreach ($person->getPersonGroup() as $personGroup) {
dump($personGroup);
}
return $this->render('person/detail.html.twig', [
'person' => $person
]);
}
Person class / entity:
class Person
{
/**
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string")
*/
private $name;
/**
* #ORM\OneToMany(targetEntity="AppBundle\Entity\PersonGroup", mappedBy="person")
*/
private $personGroups;
/**
* Item constructor.
*/
public function __construct()
{
$this->personGroups= new ArrayCollection();
}
/**
* #return mixed
*/
public function getId()
{
return $this->id;
}
/**
* #param mixed $id
*/
public function setId($id)
{
$this->id = $id;
}
/**
* #return mixed
*/
public function getName()
{
return $this->name;
}
/**
* #param mixed $name
*/
public function setName($name)
{
$this->name = $name;
}
/**
* #return ArrayCollection*
*/
public function getPersonGroups()
{
return $this->personGroups;
}
}
Group class/Entity:
class Group
{
/**
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string")
*/
private $name;
/**
* #ORM\OneToMany(targetEntity="AppBundle\Entity\PersonGroup", mappedBy="group")
*/
private $personGroups;
/**
* Item constructor.
*/
public function __construct()
{
$this->personGroups= new ArrayCollection();
}
/**
* #return mixed
*/
public function getId()
{
return $this->id;
}
/**
* #param mixed $id
*/
public function setId($id)
{
$this->id = $id;
}
/**
* #return mixed
*/
public function getName()
{
return $this->name;
}
/**
* #param mixed $name
*/
public function setName($name)
{
$this->name = $name;
}
/**
* #return ArrayCollection*
*/
public function getPersonGroups()
{
return $this->personGroups;
}
}
PersonGroup class / entity:
class PersonGroup
{
/**
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\Person", inversedBy="group")
* #ORM\JoinColumn(nullable=false)
*/
private $person;
/**
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\Group", inversedBy="person")
* #ORM\JoinColumn(nullable=false)
*/
private $group;
/**
* #return mixed
*/
public function getId()
{
return $this->id;
}
/**
* #param mixed $id
*/
public function setId($id)
{
$this->id = $id;
}
/**
* #return Person
*/
public function getPerson()
{
return $this->person;
}
/**
* #param Person $person
*/
public function setPerson(Person $person)
{
$this->person = $person;
}
/**
* #return Group
*/
public function getGroup()
{
return $this->group;
}
/**
* #param Group $group
*/
public function setGroup(Group $group)
{
$this->group = $group;
}
}

Answer 1

You can access to your Group entity from PersonGroup
/**
* #Route("/person/{personId}", name="personController")
*/
public function showAction($personId)
{
$em = $this->getDoctrine()->getManager();
$item = $em->getRepository('AppBundle:Person')
->findOneBy(['id' => $personId]);
foreach ($person->getPersonGroup() as $personGroup) {
dump($personGroup->getGroup());
}
return $this->render('person/detail.html.twig', [
'person' => $person
]);
}
But you should create a custom function in Group repository and Person repository to retrieve the correct entity.
EDIT
If you want te retrieve all the Group entity you should add a parameter fetch="EAGER" to your relations, it will automatically do aan innerJoin on your relation.
class PersonGroup
{
/**
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\Person", inversedBy="group", fetch="EAGER")
* #ORM\JoinColumn(nullable=false)
*/
private $person;
/**
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\Group", inversedBy="person", fetch="EAGER")
* #ORM\JoinColumn(nullable=false)
*/
private $group;
For example if you want to get All Groups from a Person you can do a custom repository function.
Ex:
<?php
namespace AppBundle\Repository;
use AppBundle\Entity\Person;
/**
* GroupRepository
*
* This class was generated by the Doctrine ORM. Add your own custom
* repository methods below.
*/
class GroupRepository extends \Doctrine\ORM\EntityRepository
{
public function findByPerson(Person $person){
return $this->createQueryBuilder('g')
->leftJoin('g.personGroups', 'pg')
->leftJoin('pg.person', 'p')
->where('p.id = :personId')
->setParameter('personId', $person->getId())
->getQuery()->getResult();
}
}