Rating.php

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<?php
namespace Magento\Review\Model;

use Magento\Framework\DataObject\IdentityInterface;

class Rating extends \Magento\Framework\Model\AbstractModel implements IdentityInterface
{
    const ENTITY_PRODUCT_CODE = 'product';

    const ENTITY_PRODUCT_REVIEW_CODE = 'product_review';

    const ENTITY_REVIEW_CODE = 'review';

    protected $_ratingOptionFactory;

    protected $_ratingCollectionF;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Review\Model\Rating\OptionFactory $ratingOptionFactory,
        \Magento\Review\Model\ResourceModel\Rating\Option\CollectionFactory $ratingCollectionF,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->_ratingOptionFactory = $ratingOptionFactory;
        $this->_ratingCollectionF = $ratingCollectionF;
        parent::__construct($context, $registry, $resource, $resourceCollection, $data);
    }

    protected function _construct()
    {
        $this->_init(\Magento\Review\Model\ResourceModel\Rating::class);
    }

    public function addOptionVote($optionId, $entityPkValue)
    {
        $this->_ratingOptionFactory->create()->setOptionId(
            $optionId
        )->setRatingId(
            $this->getId()
        )->setReviewId(
            $this->getReviewId()
        )->setEntityPkValue(
            $entityPkValue
        )->addVote();
        return $this;
    }

    public function updateOptionVote($optionId)
    {
        $this->_ratingOptionFactory->create()->setOptionId(
            $optionId
        )->setVoteId(
            $this->getVoteId()
        )->setReviewId(
            $this->getReviewId()
        )->setDoUpdate(
            1
        )->addVote();
        return $this;
    }

    public function getOptions()
    {
        $options = $this->getData('options');
        if ($options) {
            return $options;
        } elseif ($this->getId()) {
            return $this->_ratingCollectionF->create()->addRatingFilter(
                $this->getId()
            )->setPositionOrder()->load()->getItems();
        }
        return [];
    }

    public function getEntitySummary($entityPkValue, $onlyForCurrentStore = true)
    {
        $this->setEntityPkValue($entityPkValue);
        return $this->_getResource()->getEntitySummary($this, $onlyForCurrentStore);
    }

    public function getReviewSummary($reviewId, $onlyForCurrentStore = true)
    {
        $this->setReviewId($reviewId);
        return $this->_getResource()->getReviewSummary($this, $onlyForCurrentStore);
    }

    public function getEntityIdByCode($entityCode)
    {
        return $this->getResource()->getEntityIdByCode($entityCode);
    }

    public function getIdentities()
    {
        // clear cache for all reviews
        return [Review::CACHE_TAG];
    }
}