Doctrine : how to set value to null instead entity - php

Question

I have a problem with my Doctrine Entity.
In my module, I have a history to list actions performed by users.
During the process, I use a ManyToOne relation of my Entity towards herself.
When I update an item in my database, I use "setGain()" to refer this result to another, but if I want to cancel an action from user I need to set as null the value of setGain(), but Doctrine doesn't accept it and return :
PHP Catchable fatal error: Argument 1 passed to Paris\Entity\Historique::setGain() must be an instance of Paris\Entity\Historique, null given
My Entity is :
<?php
namespace Paris\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* Historique
*
* #ORM\Table(name="paris__historique")
* #ORM\Entity
*/
class Historique {
/**
* #var integer
*
* #ORM\Column(name="id_historique", type="integer", precision=0, scale=0, nullable=false, unique=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id_historique;
/**
* #var integer
*
* #ORM\Column(name="id_jol", type="integer", length=11, precision=0, scale=0, nullable=true, unique=false)
*/
private $id_jol;
/**
* #var string
*
* #ORM\Column(name="action", type="string", length=50, precision=0, scale=0, nullable=false, unique=false)
*/
private $action;
/**
* #var string
*
* #ORM\Column(name="detail", type="text", precision=0, scale=0, nullable=true, unique=false)
*/
private $detail;
/**
* #var integer
*
* #ORM\ManyToOne(targetEntity="\Paris\Entity\Historique")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="id_gain", referencedColumnName="id_historique", nullable=true)
* })
*/
private $id_gain;
/**
* #var integer
*
* #ORM\ManyToOne(targetEntity="\Paris\Entity\Parieur")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="id_participant", referencedColumnName="id_participant", nullable=true)
* })
*/
private $id_participant;
/**
* #var integer
*
* #ORM\ManyToOne(targetEntity="\Paris\Entity\Concours")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="id_concours", referencedColumnName="id_concours", nullable=true)
* })
*/
private $id_concours;
/**
* #var integer
*
* #ORM\ManyToOne(targetEntity="\Paris\Entity\Periode")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="id_periode", referencedColumnName="id_periode", nullable=true)
* })
*/
private $id_periode;
/**
* #var integer
*
* #ORM\ManyToOne(targetEntity="\Paris\Entity\Paris")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="id_paris", referencedColumnName="id_paris", nullable=true)
* })
*/
private $id_paris;
/**
* #var integer
*
* #ORM\ManyToOne(targetEntity="\Paris\Entity\Mise")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="id_mise", referencedColumnName="id_mise", nullable=true)
* })
*/
private $id_mise;
/**
* #var integer
*
* #ORM\Column(name="date_historique", type="integer", length=11, precision=0, scale=0, nullable=false, unique=false)
*/
private $date_historique;
public function getIdHistorique() {
return $this->id_historique;
}
public function setIdJol($idJol) {
$this->id_jol = $idJol;
return $this;
}
public function getIdJol() {
return $this->id_jol;
}
public function setAction($action) {
$this->action = $action;
return $this;
}
public function getAction() {
return $this->action;
}
public function getGain() {
return $this->id_gain;
}
public function setGain(\Paris\Entity\Historique $id_gain) {
$this->id_gain = $id_gain;
return $this;
}
public function setDetail($detail) {
$this->detail = $detail;
return $this;
}
public function getDetail() {
return $this->detail;
}
public function setParieur(\Paris\Entity\Parieur $id_participant) {
$this->id_participant = $id_participant;
return $this;
}
public function getParieur() {
return $this->id_participant;
}
public function setConcours(\Paris\Entity\Concours $id_concours) {
$this->id_concours = $id_concours;
return $this;
}
public function getConcours() {
return $this->id_concours;
}
public function setPeriode(\Paris\Entity\Periode $id_periode) {
$this->id_periode = $id_periode;
return $this;
}
public function getPeriode() {
return $this->id_periode;
}
public function setPari(\Paris\Entity\Paris $id_paris) {
$this->id_paris = $id_paris;
return $this;
}
public function getPari() {
return $this->id_paris;
}
public function setmise(\Paris\Entity\Mise $id_mise) {
$this->id_mise = $id_mise;
return $this;
}
public function getMise() {
return $this->id_mise;
}
public function setDate($dateHistorique) {
$this->date_historique = $dateHistorique;
return $this;
}
public function getDate() {
return $this->date_historique;
}
}
In my database, the associated field is correctly set to Null by default and Nullable.
Can you help me ? ^^
Thank you in advance for your answer.

Answer 1

Define setGain as:
public function setGain(?\Paris\Entity\Historique $id_gain) {
$this->id_gain = $id_gain;
return $this;
}
? in front of class typehint allows to pass null as an argument.
Another option is:
public function setGain(\Paris\Entity\Historique $id_gain = null) {
$this->id_gain = $id_gain;
return $this;
}