I extend Magento\Review\Block\Product\View\ListView with my own custom class, called Review.

As learned I need to extend the constructor with the same data that gets used in Magento\Review\Block\Product\View, which is extended by ListView.

However, as soon as I bring a constructor into my code, it fails. The question is: why?

Review.php (Custom Extend):


namespace MS\RealReviews\Block;

 * Entity rating block

class Review extends \Magento\Review\Block\Product\View\ListView

    protected $customer_id;
    protected $_orderCollectionFactory;

    public function __construct(    
        \Magento\Catalog\Block\Product\Context $context,
        \Magento\Framework\Url\EncoderInterface $urlEncoder,
        \Magento\Framework\Json\EncoderInterface $jsonEncoder,
        \Magento\Framework\Stdlib\StringUtils $string,
        \Magento\Catalog\Helper\Product $productHelper,
        \Magento\Catalog\Model\ProductTypes\ConfigInterface $productTypeConfig,
        \Magento\Framework\Locale\FormatInterface $localeFormat,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Catalog\Api\ProductRepositoryInterface $productRepository,
        \Magento\Framework\Pricing\PriceCurrencyInterface $priceCurrency,
        \Magento\Review\Model\ResourceModel\Review\CollectionFactory $collectionFactory,
        \Magento\Sales\Model\ResourceModel\Order\CollectionFactory $orderCollectionFactory,
        array $data = []
    ) {
        $this->_orderCollectionFactory = $orderCollectionFactory;

    protected function _setCustomerID($input){
        $this->customer_id = $input;

    protected function _getCustomerID(){
        return $this->customer_id;

    public function isRealReview($customer_id){

        $html = '';
        $product = $this->getProductId();

        $html .= $this->_getCustomerID();

        return $html;


If I delete the constructor from the code, it works again. How can I fix that?

  • Did you try to clear the var/generation folder after adding the constructor ? – Raphael at Digital Pianism Mar 30 '17 at 8:29
  • I'm at developer mode, so there isn't really a need for that AFAIK – Max Mar 30 '17 at 8:44
  • you still need to clear that var/generation folder manually even in dev mode as soon as you modify the constructors of classes – Raphael at Digital Pianism Mar 30 '17 at 8:53
  • Cool. Actually that seemed to work. Thanks, Raphael. If you write an answer with that and maybe a little more detail I'm happy to mark it as the correct answer to help others in the future! – Max Mar 30 '17 at 8:58

The solution is to clear the var/generation code.

This is indeed required as soon as you start dealing with class constructors, you can find out more here in the official documentation: http://devdocs.magento.com/guides/v2.0/howdoi/php/php_clear-dirs.html

| improve this answer | |
  • Using $ rm -rf var/generation/* has worked perfectly fine. Magento2 could handle this a little better IMHO, but its fine. Thanks for the hint, Raphael. – Max Mar 30 '17 at 9:04

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