How do I get the base object from within a plugin?

Question

How do I get the object that my plugin is attached to from within an after plugin? I thought it would be the $subject parameter, but that doesn't seem to be it.

My plugin is defined like this

di.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\ConfigurableProduct\Block\Product\View\Type\Configurable">
        <plugin name="MyCompany_Configurable" type="MyCompany\ConfigurableProduct\Plugin\Configurable" sortOrder="10" disabled="false"/>
    </type>
</config>

Configurable.php

public function afterGetJsonConfig($subject, $result)
{
    // ...
}

I assumed that $subject should be an instance of Magento\ConfigurableProduct\Block\Product\View\Type\Configurable, but when the plugin runs, $subject is actually Magento\Swatches\Block\Product\Renderer\Configurable\Interceptor.

The reason that this matters is because I want to call getAttributesForCollection on the object that the plugin is attached to. However, if I call $subject.getAttributesForCollection(...) it returns null. When getAttributesForCollection(...) is called in the base class (Magento\ConfigurableProduct\Block\Product\View\Type\Configurable), it returns an array.

Answer 1

The method getAttributeForCollection is only available in the class Magento\ConfigurableProduct\Model\Product\Type\Configurable

You can check the original getJsonConfig Method on how the attribute data in the JSON is implemented.