symfony2
Doctrine-relaties

Eén op veel, bidirectioneel

Deze bidirectionele mapping vereist de mappedBy attribuut op de OneToMany vereniging en de inversedBy attribuut op de ManyToOne vereniging.

Een bidirectionele relatie heeft zowel een eigendomsrecht als een omgekeerde kant . OneToMany relaties kunnen join-tabellen gebruiken, dus u moet een eigendomszijde opgeven. De OneToMany associatie is altijd de keerzijde van een bidirectionele associatie.

<?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();
    }
}