One2Many.php

<?php
 
namespace Vendor\Bundle\Entity;
 
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
 
/**
 * @ORM\Table(name="one")
 * @ORM\Entity
 */
class One
{
    /**
     * @var Many[]|Collection
     * @ORM\OneToMany(targetEntity="Many", mappedBy="one", cascade={"persist"})
     */
    protected $manies;
    
    public function __construct()
    {
        $this->manies = new ArrayCollection();
    }
    
    /**
     * @param Many $many
     * @param bool $stopPropagation
     * @return $this
     */
    public function addMany(Many $many, $stopPropagation = false)
    {
        $this->manies->add($many);
        if(!$stopPropagation) {
            $many->setOne($this, true);
        }
        return $this;
    }
 
    /**
     * @param Many $many
     * @param bool $stopPropagation
     * @return $this
     */
    public function removeMany(Many $many, $stopPropagation = false)
    {
        $this->manies->removeElement($many);
        if(!$stopPropagation) {
            $many->setOne(null, true);
        }
        return $this;
    }
    
    /**
     * @param Many[] $manies
     * @return $this
     */
    public function setManies($manies)
    {
    	foreach($this->manies as $many) {
    	    $this->removeMany($many);
    	}
        foreach($manies as $many) {
            $this->addMany($many);
        }
        return $this;
    }
 
    /**
     * @return Many[]|Collection
     */
    public function getManies()
    {
        return $this->manies;
    }
}
 
/**
 * @ORM\Table(name="many")
 * @ORM\Entity
 */
class Many
{
    /**
     * @var One
     * @ORM\ManyToOne(targetEntity="One", inversedBy="manies")
     * @ORM\JoinColumn(name="one_id", referencedColumnName="id")
     */
    protected $one;
 
    /**
     * @param One $one
     * @param bool $stopPropagation
     * @return $this
     */
    public function setOne(One $one = null, $stopPropagation = false)
    {
        if(!$stopPropagation) {
            if(!is_null($this->one)) {
                $this->one->removeMany($this, true);
            }
            if(!is_null($one)) {
                $one->addMany($this, true);
            }
        }
        $this->one = $one;
        return $this;
    }
 
    /**
     * @return One
     */
    public function getOne()
    {
        return $this->one;
    }
}

@ElectricMaxxx

Its in a very early state, and i will be in 2.0 release, cause BC break:

saxulum-legacy/saxulum-accessor@43a050e