Override block function

Question

I want to filter wishlist product collection with a unique id. I have tried to override a method _createWishlistItemCollection located at the path /vendor/magento/module-wishlist/Block/AbstractBlock.php using preference method.

This is my di.xml file

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\Wishlist\Controller\Index\Send" type="Vendor\Module\Controller\Index\Send"/>

    <preference for="Magento\Wishlist\Block\Share\Email\Items" type="Vendor\Module\Block\Share\Email\Items"/>

</config>

This is my block file

namespace Vendor\Module\Block\Share\Email;

    class Items extends \Magento\Wishlist\Block\Share\Email\Items
    {
        protected function _createWishlistItemCollection() {
            $writer = new \Zend\Log\Writer\Stream(BP . '/var/log/testmulti.log');
            $logger = new \Zend\Log\Logger();
            $logger->addWriter($writer);
            $logger->info('Your text message');
            $collection = $this->_getWishlist()->getItemCollection();
            if($this->getMid()){
               $id = $this->getMid();
               if($this->getMid() == 'default')
                    $id = 0;
              $collection ->addFieldToFilter('multiwishlist_id', $id);
            }
            return $collection;

        }

    }

It is not entering into the overrided file. Plese help me with a solution.

Answer 1

di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
        <preference for="Magento\Wishlist\Block\Share\Email\Items" type="Vendor\Module\Block\Share\Email\Items"
</config>

Block.php

<?php
/**
 * Copyright © 2016 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */

/**
 * Wishlist block customer items
 *
 * @author     Magento Core Team <core@magentocommerce.com>
 */
namespace Vendor\Module\Block\Share\Email;

class Items extends \Magento\Wishlist\Block\Share\Email\Items
{
       public function __construct(
         \Magento\Framework\View\Element\Template\Context $context,        
         array $data = []
       ) {
            ...
             parent::__construct($context, $data);
             echo"<pre/>"; print_r("test");exit;
         } 
}

Try This code for testing After apply code remove var/ and public/static and apply setup:static-content:deploy.