Symfony2& Doctine2:removeElement不工作 [英] Symfony2 & Doctine2 : removeElement does'nt work
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问题描述
Members&汽车
$ carMembers = $ car-> getMembers();
echo count($ carMembers); // - > show 2
echo get_class(carMembers [0]); // - >显示MyCars\WSBundle\Entity\Member
$ car-> removeMember($ member);
$ em-> persist($ car);
$ em-> flush();
$ carMembers = $ car-> getMembers();
echo count($ carMembers); // - > show 1
echo get_class(carMembers [0]); // - >显示MyCars\WSBundle\CarsController !!!
有我的实体:
Car
/ **
* @ ORM\ManyToMany(targetEntity =Member ,mappedBy =cars)
* /
private $ members;
/ **
*删除会员
*
* @param MyCars\WSBundle\Entity\Member $ member
* /
public function removeMember(\MyCars\WSBundle\Entity\Member $ member)
{
$ this-> members-> removeElement($ member);
$ member-> removeCar($ this);
}
会员
/ **
* @ ORM\ManyToMany(targetEntity =Car,cascade = {persist})
* ORM\JoinTable(name =cars_membres,
* joinColumns = {@ ORM\JoinColumn(name =member_id,referencedColumnName =member_id)},
* inverseJoinColumns = {@ ORM\\ \\ JoinColumn(name =car_id,referencedColumnName =car_id)}
*)
* /
private $ cars;
任何人都可以帮忙?
解决方案
确保在类构造函数中初始化ArrayCollection,如果要使用 add ,包含或 removeElement
<?php
// ...
使用Doctrine\Common\Collections\ArrayCollection;
class Car
{
/ **
* @ MongoDB \Id
* /
protected $ members;
/ **
*一般构造函数
* /
public function __construct()
{
$ this-> members = new ArrayCollection的();
}
/ **
* @param会员$ member
* @return $ this
* /
public function addMember(Member $ member
{
if(!$ this-> hasMember($ member)){
$ this-> members-> add($ member);
}
return $ this;
}
/ **
* @param会员$会员
* @return $ this
* /
public function removeMember $ member
{
if($ this-> hasMember($ member)){
$ this-> members-> removeElement($ member);
}
return $ this;
}
/ **
* @return mixed
* /
public function getMembers()
{
return $这 - >标签;
}
/ **
* @param会员$ member
* @return mixed
* /
public function hasTag(Member $成员)
{
return $ this-> members-> contains($ member);
}
}
I'm have a small project in Symfony2 and doctrine, and I'm trying to update 2 related entities :
Members & cars
$carMembers = $car->getMembers();
echo count($carMembers); // --> show 2
echo get_class(carMembers[0]); // --> show MyCars\WSBundle\Entity\Member
$car->removeMember($member);
$em->persist($car);
$em->flush();
$carMembers= $car->getMembers();
echo count($carMembers); // --> show 1
echo get_class(carMembers[0]); // --> show MyCars\WSBundle\CarsController !!!
there is my Entities :
Car
/**
* @ORM\ManyToMany(targetEntity="Member", mappedBy="cars")
*/
private $members;
/**
* Remove Member
*
* @param MyCars\WSBundle\Entity\Member $member
*/
public function removeMember(\MyCars\WSBundle\Entity\Member $member)
{
$this->members->removeElement($member);
$member->removeCar($this);
}
Member
/**
* @ORM\ManyToMany(targetEntity="Car", cascade={"persist"})
* @ORM\JoinTable(name="cars_membres",
* joinColumns={@ORM\JoinColumn(name="member_id", referencedColumnName="member_id")},
* inverseJoinColumns={@ORM\JoinColumn(name="car_id", referencedColumnName="car_id")}
* )
*/
private $cars;
Can anyone help ?
解决方案
Make sure to initialise the ArrayCollection in the class constructor, if you want to use the functions add, contains or removeElement
<?php
// ...
use Doctrine\Common\Collections\ArrayCollection;
class Car
{
/**
* @MongoDB\Id
*/
protected $members;
/**
* General constructor
*/
public function __construct()
{
$this->members = new ArrayCollection();
}
/**
* @param Member $member
* @return $this
*/
public function addMember(Member $member)
{
if (!$this->hasMember($member)) {
$this->members->add($member);
}
return $this;
}
/**
* @param Member $member
* @return $this
*/
public function removeMember(Member $member)
{
if ($this->hasMember($member)) {
$this->members->removeElement($member);
}
return $this;
}
/**
* @return mixed
*/
public function getMembers()
{
return $this->tags;
}
/**
* @param Member $member
* @return mixed
*/
public function hasTag(Member $member)
{
return $this->members->contains($member);
}
}
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