Calling same overridden custom class from 2 modules

Question

I have a custom overriden class say Result.php overridden from CatalogSearch module.

Now if i have to use this Result class in 2 different modules(Module1 and Module2), do i have to override the class in both the modules (in the 'type' attribute of di)??

etc/di of Module1:

<preference for="Magento\CatalogSearch\Block\Result" type="Vendor/Module1/Block/Result">

etc/di of Module2:

<preference for="Magento\CatalogSearch\Block\Result" type="Vendor/Module2/Block/Result">

In the above case, if i want to track as to which Result from my custom module is getting called?

PROBLEM:

I tried echo in Module1's Result class somefun(), i get it, but i comment out the same and try in Module2's Result class somefun(), i dont get

Why?

Can i use something like this in Module2 di.

<preference for="Magento\CatalogSearch\Block\Result" type="Vendor/Module1/Block/Result">

I gave module1 in type

Answer 1

You can try below code

UPDATED

<preference for="Vendor\Module2\​Block\Result" type="Vendor\Module1‌\Block\Result">

Do not use all functions unless you need to modify, if function is not found it will look into parent class.

I have added a small example to have the basic fallback.

1. First module (Vendor\Module)

\app\code\Vendor\Module\etc\frontend\di.xml

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

Create Block

\app\code\Vendor\Module\Block\Result.php

<?php
namespace Vendor\Module\Block;
class Result extends \Magento\CatalogSearch\Block\Result
{
        protected function _prepareLayout()
    {
        echo "Vendor\Module";
        exit;

        //return parent::_prepareLayout();

    }
}

2. Second module (Vendor\Moduletwo)

\app\code\Vendor\Moduletwo\etc\frontend\di.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
<preference for="Vendor\Module\Block\Result" type="Vendor\Moduletwo\Block\Result" />
</config>

Create Block

\app\code\Vendor\Moduletwo\Block\Result.php

<?php

namespace Vendor\Moduletwo\Block;
class Result extends \Vendor\Module\Block\Result
{
    protected function _prepareLayout()
    {
        echo "Vendor\Moduletwo";
        exit;

        //return parent::_prepareLayout();
    }
}

Run setup-upgrade, remove cache and search some string in header mini search.

Please consider this is an example.

Hope this helps.