使用插件方法覆盖核心块

Question

I have created a module in which i am overwriting core functionality of product listing widget. I can achieve this using preference but i want to understand plugin method.. Below is my code for frontend/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">
    <type name="Magento\CatalogWidget\Block\Product\ProductsList">
        <plugin name="widget_product_listing_add_attribute" type="Test\CatalogWidget\Plugin\Block\Product\ProductsListAddAttributePlugin" sortOrder="1"/>
    </type>
</config>

and below is my code for plugin block.

namespace Test\CatalogWidget\Plugin\Block\Product;

class ProductsListAddAttributePlugin
{
    public function beforeCreateCollection(\Magento\CatalogWidget\Block\Product\ProductsList $subject, \Magento\Catalog\Model\ResourceModel\Product\Collection $result)
    {
        /**
        * @var \Magento\CatalogWidget\Block\Product\ProductsList $subject
        * @var \Magento\Catalog\Model\ResourceModel\Product\Collection $result
        */

        die('ProductsListAddAttributePlugin before....');

    }
}

after installing module and running di:compile.. when i reload the page i am getting below error.

Fatal error: Uncaught ArgumentCountError: Too few arguments to function Test\CatalogWidget\Plugin\Block\Product\ProductsListAddAttributePlugin::beforeCreateCollection(), 1 passed in C:\xampp\htdocs\projects\hello\vendor\magento\framework\Interception\Interceptor.php on line 121 and exactly 2 expected in C:\xampp\htdocs\projects\hello\app\code\Test\CatalogWidget\Plugin\Block\Product\ProductsListAddAttributePlugin.php:6 Stack trace: #0 C:\xampp\htdocs\projects\hello\vendor\magento\framework\Interception\Interceptor.php(121): Test\CatalogWidget\Plugin\Block\Product\ProductsListAddAttributePlugin->beforeCreateCollection(Object(Magento\CatalogWidget\Block\Product\ProductsList\Interceptor))

1 C:\xampp\htdocs\projects\hello\vendor\magento\framework\Interception\Interceptor.php(153):

Magento\CatalogWidget\Block\Product\ProductsList\Interceptor->Magento\Framework\Interception{closure}()

2 C:\xampp\htdocs\projects\hello\generated\code\Magento\CatalogWidget\Block\Product\ProductsList\Interceptor.php(26):

Mag in C:\xampp\htdocs\projects\hello\app\code\Test\CatalogWidget\Plugin\Block\Product\ProductsListAddAttributePlugin.php on line 6

Answer 1

Have you run setup:di:compile and clear the cache? after updating the beforeCreateCollection method?

It looks like you're correctly passing two arguments through, but it might be referring to an older DI.