I am trying to overwrite a core template and add my custom logic using a viewModel as follows:

<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <referenceBlock name="name.of.the.core.block" template="Vendor_CustomModule::path/to/template.phtml">
           <argument name="viewModel" xsi:type="object">Vendor\CustomModule\ViewModel\Class</argument>

But it's not working.

I know it is possible to inject viewModels into blocks but not sure if it is possible by referencing an existing block?

2 Answers 2


It is possible and it works as expected!

The reason why it was not working was because I was not implementing the right interface in my viewModel class.

All viewModels need to to implement ArgumentInterface.

namespace Vendor\CustomModule\ViewModel;

class Class implements \Magento\Framework\View\Element\Block\ArgumentInterface
    public function __construct()


I'm not exactly clear what's your question and what you're trying to do by <arguments> element. But I can say you can't use "template" attribute inside the "<referenceBlock>" element as it's invalid.

Maybe you can redefine the core block with the same name.

  • 1
    Hi, yes you can. In fact, it is one of the two ways (and I think the only that works) you can use to replace a block template using layout. You can read more about it here: devdocs.magento.com/guides/v2.2/frontend-dev-guide/layouts/…
    – diazwatson
    Commented May 29, 2018 at 3:40
  • But the question is about viewModel and the possibility to inject them in a core block to modify the blocks template.
    – diazwatson
    Commented May 31, 2018 at 12:15

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.