Support for Logging Embedded MongoDB Documents

[cnizzardini]

For me, it wasn't clear if this library supports Logging mongo db embedded documents and I frankly couldn't determine whether or not some of the past PRs added support for this or not. Using gedmo/doctrine-extensions:^3.0 with gedmo/doctrine-extensions:2.1.2 I have a document with an ODM\EmbedMany of ratings. While I can log on the parent document, I get the following error when logging on the embedded documents:

Cannot apply versioning to field [ratings] as it is collection in object - App\Document\Services

<?php

namespace App\Document;

use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
use Gedmo\Mapping\Annotation as Gedmo;

/**
 * @ODM\Document
 * @Gedmo\Loggable
 */
class Services
{
    //use InvestmentTrait;

    /**
     * @ODM\Id(strategy="INCREMENT", type="integer")
     */
     private $id;

    /**
     * @ODM\Field(type="string")
     * @Gedmo\Versioned
     */
    private $title;

    /**
     * @ODM\EmbedMany(targetDocument=Rating::class)
     * @Gedmo\ReferenceMany(type="document", class="Rating", mappedBy="ratings", inversedBy="Services")
     * @Gedmo\Versioned
     */
    private $ratings;

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

    public function setId(int $id)
    {
        $this->id = $id;

        return $this;
    }

    public function getId()
    {
      return $this->id;
    }

    public function getRatings()
    {
        return $this->ratings;
    }

    public function setRatings(array $ratings) : self
    {
        foreach ($ratings as $rating) {
            if (!$rating instanceof Rating) {
                $rating = new Rating($rating);
            }
            $this->addRatings($rating);
        }

        return $this;
    }

    public function addRatings(Rating $rating) : self
    {
        $this->ratings[] = $rating;

        return $this;
    }

    public function getTitle(): ?string
    {
        return $this->title;
    }

    public function setTitle(string $title): self
    {
        $this->title = $title;

        return $this;
    }
}

Not sure if this library is meant to support this. I only added Gedmo\ReferenceMany as a troubleshooting step.

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