Symfony2删除并保存多对多关系 [英] Symfony2 remove and save many to many relations

问题描述

我今天需要你的帮助.我正在使用Symfony 2.1开发一个小型应用程序，但是我有一个基本问题，我必须使用具有多对多关系的表来创建第三个表:

I need your help today. I'm working on a small application using Symfony 2.1 but I have a base problem, I have to tables with a many to many relation which creates a third table:

class Usuario implements UserInterface {
/**
* @ORM\ManyToMany(targetEntity="Alood\BackBundle\Entity\Alergeno", inversedBy="usuarios")
* @ORM\JoinTable(name="UsuariosProductos",
 *      joinColumns={@ORM\JoinColumn(name="usuario_user", referencedColumnName="user")},
 *      inverseJoinColumns={@ORM\JoinColumn(name="alergeno_id", referencedColumnName="id")}
 *      )
**/
protected $alergenos;
}


public function __construct(){
    $this->alergenos = new ArrayCollection();
}

public function getAlergenos() { return $this->alergenos; }

和:

/**
* @ORM\ManyToMany(targetEntity="Alood\BackBundle\Entity\Usuario", mappedBy="alergenos")
**/
protected $usuarios;

然后我需要删除未选择的Alergenos，这是我的控制器:

Then I need to remove the non selected Alergenos, this is my controller:

$alergenosUser = $em->getRepository("BackBundle:Usuario")->find($usuario);

$resultSym = array_diff($alergenosUsuarioIds, $alergen);

foreach($resultSym as $result) {
    $alergenosUser->getAlergenos()->remove($result);
}
$em->persist($alergenosUser);
$em->flush();

您能帮我弄清楚我做错了什么吗?非常感谢你！

Could you please help me to figure out what I'm doing wrong? Thanks you so much!

推荐答案

要从集合中删除项目，请使用以下命令:

In order to remove an item from a collection use the following:

$collection->removeElement($item);

remove($key)函数将按键删除，而removeElement($item)将从集合中删除该项目(如果找到).在 ArrayCollection代码此处.

The remove($key) function will remove by key while removeElement($item) removes the item from the collection if found. Have a look at the ArrayCollection code here.

请注意，学说只会检查关系的所有权方是否发生变化.

Be aware that doctrine will only check the owning side of a relation for changes.

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