Magento 2: Override Magento\Catalog\Block\Product\View Block

Question

I have developed one custom module and i have tried to override product view block by following these two links Overriding Block in Magento 2 and DI & Extending a Block on Magento 2 but when i hit product view page its gives me 404 page. what i have done so far is below

di.xml

 <?xml version="1.0"?>
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/ObjectManager/etc/config.xsd">
 <preference for="Magento\Catalog\Block\Product\View" type="TT\Helloworld\Block\Myproduct"/>
 </config>

Myproduct.php

<?php
namespace TT\Helloworld\Block;
use Magento\Framework\View\Element\Template;
use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Catalog\Model\Product;
class Myproduct extends \Magento\Catalog\Block\Product\View
{
protected $_helper;
protected $_objectManager;
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,
 ProductRepositoryInterface $productRepository,
 \Magento\Framework\Pricing\PriceCurrencyInterface $priceCurrency,
 array $data = [],
 \TT\Helloworld\Helper\Data $helper 
) {
 parent::__construct($context, $urlEncoder, $jsonEncoder, $string, $productHelper, $productTypeConfig, $localeFormat, $customerSession, $productRepository, $priceCurrency, $data,$helper);
 $this->_helper = $helper;
}
protected function _toHtml()
{
 $this->setModuleName($this->extractModuleName('Magento\Catalog\Block\Product\View'));
 return parent::_toHtml();
}

As per DI & Extending a Block on Magento 2 link i have also included all the parent class construct parameter in Myproduct.php constructer.

anyone one know where i'm wrong? or what is the correct way to override this?

• Anand Ontigeri: you will find your solution follow the link. magento.stackexchange.com/questions/86497/…
• chirag dodia: @AnandOntigeri that solution also not working can you add solution here?
• bchatard: TT\Helloworld\Block\Myproduct.php ==> TT\Helloworld\Block\Myproduct (remove .php)
• chirag dodia: @BriceC.that also not working
• bchatard: remove C:\xampp\htdocs\Magento2\var\generation\TT\Helloworld\Block\Myproduct\Intercepto‌​r.php and comment the __construct method and try again please

Answer 1

To resume

• comment __construct method (temporary solution)
• remove Interceptor generated (new one will be generated - need to be removed after each modification of __construct method)
• in your layout use template="TT_Helloworld::myproduct.phtml"

• chirag dodia: i don't understand what is the reason behind remove __construct method from my class?
• bchatard: it was for debug, you can now try to uncomment the method.

Answer 2

you need to enter \TT\Helloworld\Helper\Data $helper before array $data = [] in the __contruct

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,
 ProductRepositoryInterface $productRepository,
 \Magento\Framework\Pricing\PriceCurrencyInterface $priceCurrency,
 \TT\Helloworld\Helper\Data $helper ,
 array $data = []
) {
 parent::__construct($context, $urlEncoder, $jsonEncoder, $string, $productHelper, $productTypeConfig, $localeFormat, $customerSession, $productRepository, $priceCurrency, $data,$helper);