How to get product rating using object manager in magento 2

Question

i want to get products rating using object manager i tried below mention code but its not working for me please guide me

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$reviewFactory = $objectManager->create('Magento\Review\Model\Review');

$storeId = $this->_storeManager->getStore()->getId();
$reviewFactory->getEntitySummary($product, $storeId);

$ratingSummary = $product->getRatingSummary()->getRatingSummary();

Answer 1

Try to use this below code :

Method 1 :

$product_id = '1';
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$rating = $objectManager->create('\Magento\Review\Model\Rating');
$review = $objectManager->create('\Magento\Review\Model\Review');
$storeManager = $objectManager->create("\Magento\Store\Model\StoreManagerInterface");
$_ratingSummary = $rating->getEntitySummary($product_id);
$ratingCollection = $review->getResourceCollection()
                    ->addStoreFilter($storeManager->getStore()->getId())
                    ->addStatusFilter(\Magento\Review\Model\Review::STATUS_APPROVED)
                    ->addEntityFilter('product', $product_id);
$review_count = count($ratingCollection); // How many review in that specific product
$product_rating = '';
if ($_ratingSummary->getSum() > 0 && $_ratingSummary->getCount() > 0) {
     $product_rating = $_ratingSummary->getSum() / $_ratingSummary->getCount(); // Product rating in percentage
}    

Method 2 :

    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    $rating = $objectManager->create('\Magento\Review\Model\Rating');
    $storeManager = $objectManager->create("\Magento\Store\Model\StoreManagerInterface");
    $ratingCollection = $rating->getResourceCollection()->addEntityFilter(
        'product',$product_id
    )->setPositionOrder()->setStoreFilter(
        $storeManager->getStore()->getId()
    )->addRatingPerStoreName(
        $storeManager->getStore()->getId()
    )->load();
    echo "<pre>";print_r($ratingCollection->getData());

Output Like :

Array
(
    [0] => Array
        (
            [rating_id] => 3
            [entity_id] => 1
            [rating_code] => Rating
            [position] => 0
            [is_active] => 1
            [entity_code] => product
        )

)

Note : Avoid to use Object Manager Method. Use Factory Method Structure.

Reference