symfony2
Doktrin-Entity-Beziehungen

Eins-zu-Viele, bidirektional

Dieses bidirektionale Mapping erfordert das mappedBy Attribut auf dem OneToMany Verband und das inversedBy Attribut auf der ManyToOne Vereinigung.

Eine bidirektionale Beziehung hat sowohl eine eigene als auch eine inverse Seite . OneToMany Beziehungen können Join-Tabellen verwenden, daher müssen Sie eine eigene Seite angeben. Die OneToMany Assoziation ist immer die inverse Seite einer bidirektionalen Assoziation.

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 * @ORM\Table(name="users")
 */
class User
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;
     
     /**
     * @var string
     *
     * @ORM\Column(name="username", type="string", length=255)
     */
    protected $username;

    /**
     * @var Group|null
     *
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Group", inversedBy="users")
     * @ORM\JoinColumn(name="group_id", referencedColumnName="id", nullable=true)
     */
    protected $group;

    /**
     * @param string $username
     * @param Group|null $group
     */
    public function __construct($username, Group $group = null)
    {
        $this->username = $username;
        $this->group = $group;
    }

    /**
     * Set username
     *
     * @param string $username
     */
    public function setUsername($username)
    {
        $this->username = $username;
    }

    /**
     * Get username
     *
     * @return string 
     */
    public function getUsername()
    {
        return $this->username;
    }

    /**
     * @param Group|null $group
     */
    public function setGroup(Group $group = null)
    {
        if($this->group !== null) {
            $this->group->removeUser($this);
        }

        if ($group !== null) {
            $group->addUser($this);
        }

        $this->group = $group;
    }

    /**
     * Get group
     *
     * @return Group|null
     */
    public function getGroup()
    {
        return $this->group;
    }
}

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;

/**
 * @ORM\Entity
 * @ORM\Table(name="groups")
 */
class Group
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\Column(name="name", type="string", length=255)
     */
    protected $name;

    /**
     * @ORM\OneToMany(targetEntity="AppBundle\Entity\User", mappedBy="group")
     */
    protected $users;

    /**
     * @param string $name
     */
    public function __construct($name)
    {
        $this->name = $name;
        $this->users = new ArrayCollection();
    }

    /**
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * @param string $name
     */
    public function setName($name)
    {
        $this->name = $name;
    }

    public function addUser(User $user)
    {
        if (!$this->getUsers()->contains($user)) {
            $this->getUsers()->add($user);
        }
    }

    public function removeUser(User $user)
    {
        if ($this->getUsers()->contains($user)) {
            $this->getUsers()->removeElement($user);
        }
    }

    public function getUsers()
    {
        return $this->users;
    }

    public function __toString()
    {
        return (string) $this->getName();
    }
}