Get the average rating of the current category

Question

I'm new to magento and i'm currently working on the CE1.9 for work. I'm having trouble to get the average rating of the current category.

$category_id = Mage::getModel('catalog/layer')->getCurrentCategory()->getId();
$category = Mage::getModel('catalog/category')->load($category_id);
$products = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('*')->addCategoryFilter($category)->load();

$reviews = array();

foreach ($products as $product) {
    $productId = $product->getId();
    array_push($reviews, Mage::getModel('review/review')
            ->getResourceCollection()
            ->addStoreFilter(Mage::app()->getStore()->getId())
            ->addEntityFilter('product', $productId)
            ->addStatusFilter(Mage_Review_Model_Review::STATUS_APPROVED)
            ->setDateOrder()
            ->addRateVotes()
    );
}


foreach ($reviews as $review) {
    $_votes = $review->getRatingVotes()->getFirstItem();
    if($_votes->
    $totalRating += $_votes->getFirstItem()->getValue();
}
Zend_debug::dump(100 * $totalRating / (5 * $reviews));

Answer 1

Okay, I solved it myself.

For those interested, here is the code:

    $categoryId = Mage::getModel('catalog/layer')->getCurrentCategory()->getId();
    $currentCategory = Mage::getModel('catalog/category')->load($categoryId);
    $productList = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('*')->addCategoryFilter($currentCategory)->load();
    $reviewList = array();
    $storeId = Mage::app()->getStore()->getId();
    foreach ($productList as $product) {
        $summaryData = Mage::getModel('review/review_summary')->setStoreId($storeId)->load($product->getEntityID());
        $reviewData[] = $summaryData['rating_summary'] / 20;
    }
    $nbReview = 0;
    foreach ($reviewData as $review) {
        if ($review != Null)
            $nbReviews++;
            $totalReviewIntoStar += $review;
    }
    return $AvgRating = $totalReviewIntoStar / $nbReviews;