Many to many relation with keeping old database - php

Question

I have to rewrite application from zf1 to sf2.
But I need to keep old database schema.
And I have problem with many to many relations.
There are 2 entities: Exceptions, Regions and it was too Exceptionregions, but I deleted it.
There are 3 tables in database - exceptions, regions and exceptionregions, which is hash table.
Below I attach screen with relations:
My code:
1. Exception entity:
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;
/**
* Exceptions
*
* #ORM\Table(name="Exceptions")
* #ORM\Entity
*/
class Exceptions
{
/**
* #var integer
*
* #ORM\Column(name="ExceptionID", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $exceptionid;
/**
* Many exceptions have many regions.
* #ORM\ManyToMany(targetEntity="Regions", inversedBy="exceptions")
* #ORM\JoinTable(name="exceptionregions"),
* joinColumns={#ORM\JoinColumn(name="ExceptionID", referencedColumnName="ExceptionID")},
* inverseJoinColumns={#ORM\JoinColumn(name="RegionID", referencedColumnName="RegionID")}
* )
*/
private $regions;
public function __construct()
{
$this->regions = new \Doctrine\Common\Collections\ArrayCollection();
}
/**
* Add region
*
* #param AppBundle\Entity\Regions $region
*/
public function addRegion(\AppBundle\Entity\Regions $regions)
{
$this->regions[] = $regions;
}
/**
* Get regions
*
* #return \Doctrine\Common\Collections\Collection
*/
public function getRegions()
{
return $this->regions;
}
...
}
Region entity:
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* Regions
*
* #ORM\Table(name="Regions")
* #ORM\Entity
*/
class Regions
{
/**
* #var string
*
* #ORM\Column(name="RegionName", type="string", length=45, nullable=false)
*/
private $regionname;
/**
* #var integer
*
* #ORM\Column(name="RegionID", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $regionid;
/**
* #ORM\ManyToMany(targetEntity="Exceptions", mappedBy="regions")
*/
private $exceptions;
...
}
And I got this error:
The column id must be mapped to a field in class AppBundle\Entity\Exceptions since it is referenced by a join column of another class.
Of course entity Exceptions is connected with few entities, not only regions.
I got stuck with this issue, I can't resolve this problem and continue my project.
Anybody has any idea how to repair this or any advice? What am I doing wrong?
I'd be grateful for any comment.

Answer 1

I found a solution for this problem.
Maybe someone will benefit from this too.
So, the working code:
/**
* Many exceptions have many regions.
* #ORM\ManyToMany(targetEntity="AppBundle\Entity\Regions", inversedBy="exceptions")
* #ORM\JoinTable(name="exceptionregions",
* joinColumns={
* #ORM\JoinColumn(name="ExceptionID", referencedColumnName="ExceptionID")
* },
* inverseJoinColumns={
* #ORM\JoinColumn(name="RegionID", referencedColumnName="RegionID")
* })
*/
private $regions;
#Alvin, thank you for your commitment.

Answer 2

Have you tried to make the relation bi-directional like so:
class Exceptions{
...
/**
* Many exceptions have many regions.
* #ORM\ManyToMany(targetEntity="Regions", inversedBy="exceptions")
* #ORM\JoinTable(name="regions_exceptions")
*/
private $regions;
class Regions{
...
/**
* #ORM\ManyToMany(targetEntity="Exceptions", mappedBy="regions")
*/
private $exceptions;
Not sure if that will work, but can you try it.
Documentation here:
http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/association-mapping.html#many-to-many-bidirectional
** EDIT #2 **
Can you try this change:
class Exceptions
{
/**
* #var integer
*
* #ORM\Id
* #ORM\Column(name="ExceptionID", type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $exceptionid;
Also, if that doesn't work, try:
php bin/console doctrine:schema:update --force