Unable to override Fulltext\Collection in module etc/di.xml

Question

Preconditions

1. Magento 2.1.1
2. Using Ubuntu/trusty64 vagrant-box, php7, apache

Steps to reproduce

1. Add a new custom module

2. Update etc/di.xml in your custom module

   <?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\CatalogSearch\Model\ResourceModel\Fulltext\Collection" type="Sanimarkt\App\Model\ResourceModel\Fulltext\Collection" /> 
   </config>
   

3. Add new Collection.php file and override _renderFiltersBefore() method

   namespace Sanimarkt\App\Model\ResourceModel\Fulltext;
   class Collection extends \Magento\CatalogSearch\Model\ResourceModel\Fulltext\Collection
   {
     protected function _renderFiltersBefore()
     {
       die('stopping here')
     }
   }
   

4. clear cache

5. Make a search request

Expected result

1. The search request should stop and show 'stopping here' on the screen

Actual result

1. Nothing happens the custom class

Sanimarkt\App\Model\ResourceModel\Fulltext\Collection.php is not executed.

Answer 1

It's opened on official repo - https://github.com/magento/magento2/issues/7734

Looks like it's not a bug for core team understanding. Yes, maybe, it's not a good idea, to override Fulltext\Collection, but I think it limitation, because you can not extend this class:

• Plugins don't work because of a protected method
• Events don't work, because no event is fired
• Override doesn't work, because of virtual types
• Override of virtual type doesn't work, because it breaks the search result

Answer 2

After that, you have to recompile.

bin/magento setup:upgarde

bin/magento setup:di:compile

Then check