How can I fetch rows using Docrine2 in a ManytoOne relationship - php

Question

I have the following tables, where I have no problem in inserting, updating etc. But, how can I fetch the result rows for this kind of mapping?
Organizations
-->id
-->name
users
-->id
-->first_name
doctors
-->id
-->user_id
org_doctors
-->id
-->org_id
-->doctor_id
This is my OrgDoctor Entity:
<?php
namespace Doctor\Entity;
use Doctrine\ORM\Mapping as ORM;
use Library\Entity\BaseEntity;
use User\Entity\User;
use Doctor\Entity\Doctor;
use Organization\Entity\Organization;
/**
* #ORM\Entity
* #ORM\Table(name="org_doctors")
*/
class OrgDoctor extends BaseEntity{
/**
* #ORM\ManyToOne(targetEntity="Doctor\Entity\Doctor", inversedBy="orgDoctor")
* #ORM\JoinColumn(name="doctor_id",referencedColumnName="id",nullable=false)
*/
protected $doctor;
/**
* #ORM\ManyToOne(targetEntity="Organization\Entity\Organization", inversedBy="orgDoctor")
* #ORM\JoinColumn(name="org_id", referencedColumnName="id", nullable=false)
*/
protected $organization;
public function setDoctor(Doctor $doctor = null)
{
$this->doctor = $doctor;
return $this;
}
public function getDoctor()
{
return $this->doctor;
}
public function setOrganization(Organization $organization = null)
{
$this->organization = $organization;
return $this;
}
public function getOrganization()
{
return $this->organization;
}
}
And this is my Doctor Entity:
<?php
namespace Doctor\Entity;
use Library\Entity\BaseEntity;
use Users\Entity\User;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
* #ORM\Table(name="doctors")
*/
class Doctor extends BaseEntity {
/**
* #ORM\OneToOne(targetEntity="Users\Entity\User")
* #ORM\JoinColumn(name="user_id", referencedColumnName="id", nullable=false)
* #var Users\Entity\User
*/
private $user;
/**
* #ORM\Column(name="summary", type="string")
* #var string
*/
private $summary;
function getUser() {
return $this->user;
}
function setUser(User $user) {
$this->user = $user;
}
function getSummary() {
return $this->summary;
}
function setSummary($summary) {
$this->summary = $summary;
}
}
This is how I'm fetching the result for a single doctor:
$doctor = $this->entityManager->find('Doctor\Entity\Doctor', (int) $doctorId);
How can I fetch rows from the OrgDoctor entity?
this is how i tried using queryBuilder:
$qb = $this->entityManager->createQueryBuilder();
$qb->select('od', 'd', 'o')
->from('Doctor\Entity\OrgDoctor', 'od')
->join('od.organization', 'o')
->join('od.doctor', 'd')
->where('od.organization = :organization')
->setParameter('organization', $orgId);
$query = $qb->getQuery();
$results = $query->getResult();
var_dump($results);
Notice: Undefined index: orgDoctor in C:\xampp\htdocs\corporate-wellness\vendor\doctrine\orm\lib\Doctrine\ORM\Internal\Hydration\ObjectHydrator.php on line 125
In Organization Entity:
/**
* #ORM\OneToMany(targetEntity="Doctor\Entity\OrgDoctor", mappedBy="organization")
*/
protected $orgDoctor;

Answer 1

Given your entity mapping, Doctrine should provide you with an out of the box repository for your OrgDoctor entity. That repository implements a few methods for you to retrieve entities of that type. One of them is findBy, which return arrays of OrgDoctor entities:
$this->getEntityManager()->getRepository(OrgDoctor::class)->findBy(['doctor' => $doctorId]));
$this->getEntityManager()->getRepository(OrgDoctor::class)->findBy(['organization' => $organizationId]));
$this->getEntityManager()->getRepository(OrgDoctor::class)->findBy(['doctor' => $doctorId, 'organization' => $organizationId]));
The last example, would be quite similar to findOneBy, which would return an OrgDoctor entity instead of an array:
$this->getEntityManager()->getRepository(OrgDoctor::class)->findOneBy(['doctor' => $doctorId, 'organization' => $organizationId]));
If you're planning to loop through the results and access their properties or other relationships, you might want to change the default repository strategy and define a custom repository for your OrgDoctor entity. What this will allow you to do, is to write your custom queries for retrieving your entities by means of a query builder class and DQL.
In order to avoid N+1 problems, you want to fetch join before a loop to fetch all the necessary associations in one go, so you won't be running N queries within your loop:
$qb->select('od', 'd', 'o')
->from(OrgDoctor::class, 'od')
->join('od.organization', 'o')
->join('od.doctor', 'd')
->where('od.doctor = :doctor')
->setParameter('doctor', $doctorId)
;