Association Management Methods

Association-management-methods.md

Altough the Doctrine documentation about Working with associations states: "proper bidirectional association management in plain OOP is a non-trivial task and encapsulating all the details inside the classes can be challenging" I've used the following management methods (getters. setters, adders and removers) quite successfully.

Many.php

<?php
namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/** @ORM\Entity */
class Many
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue
     */
    private $id;

    /**
     * @ORM\ManyToOne(targetEntity="Many", inversedBy="manys")
     */
    private $one;

    /**
     * @return One|null
     */
    public function getOne()
    {
        return $this->one;
    }

    /**
     * @param One $one
     * @return $this
     */
    public function setOne(One $one = null)
    {
        if ($one != $this->one) {
            if ($this->one) { $this->one->removeMany($this); }
            $this->one = $one;
            if ($one) { $this->one->addMany($this); }
        }
        return $this;
    }
}

One.php

<?php
// Entitty/One.php
namespace AppBundle\Entity;

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

/**
 * @ORM\Entity
 */
class One
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue
     */
    private $id;

    /**
     * @ORM\OneToMany(targetEntity="Many", mappedBy="one", cascade={"persist"})
     * @var ArrayCollection
     */
    private $manys;

    /**
     * One constructor.
     */
    public function __construct()
    {
        $this->manys = new ArrayCollection();
    }

    /**
     * @return ArrayCollection
     */
    public function getManys(): ArrayCollection
    {
        return $this->manys;
    }

    /**
     * @param ArrayCollection $manys
     * @return $this
     */
    public function setManys(ArrayCollection $manys)
    {
        $this->manys = $manys;
        return $this;
    }

    /**
     * @param Many $many
     * @return $this
     */
    public function addMany(Many $many)
    {
        if (!$this->manys->contains($many)) {
            $this->manys->add($many);
            $many->setOne($this);
        }
        return $this;
    }

    /**
     * @param Many $many
     * @return $this
     */
    public function removeMany(Many $many)
    {
        $many->setOne(null);
        $this->manys->removeElement($many);
        return $this;
    }
}