$block-getViewModel() returning NULL

Question

I am overriding the layout and adding ViewModel in that layout but when I try to fetch the ViewModel getting below error

PHP Fatal error: Uncaught Error: Call to a member function getCodes() on null

My XML files look life which resides under

/app/design/frontend/Custom/Theme/Magento_Review/layout/override/base/review_product_list.xml

    <page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="1column" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">+
   <body>
        <referenceBlock name="product_additional_data">
            <arguments>
                <argument name="view_model" xsi:type="object">CustomProductModelViewModelLocaleInfo</argument>
            </arguments>
        </referenceBlock>
     </body>
</page>

and my ViewModel resides under

Custom/ProductModel/ViewModel/LocaleInfo.php

and files look like

use MagentoFrameworkViewElementBlockArgumentInterface;
use MagentoFrameworkAppConfigScopeConfigInterface;
use MagentoFrameworkLocaleResolver as LocaleResolver;
use MagentoStoreModelScopeInterface;

class LocaleInfo implements ArgumentInterface
{
    protected $scopeConfig;
    protected $localeResolver;

    public function __construct(
        ScopeConfigInterface $scopeConfig,
        LocaleResolver $localeResolver
    ) {
        $this->scopeConfig = $scopeConfig;
        $this->localeResolver = $localeResolver;
    }

    public function getCodes($storeId = null)
    {
        $configPath = $this->localeResolver->getDefaultLocalePath();
        $localeCode = $this->scopeConfig->getValue($configPath, ScopeInterface::SCOPE_STORE, $storeId);

        return $localeCode;
    }
}

trying to fetch like below

$myViewModel = $block->getViewModel();
echo $myViewModel->getCodes();

layout magento2 overriding theme

Dasitha Abeysinghe · Answer

I also faced the same situation and it worked once I used the view model argument name with underscore. Same as below as per the M2 Docs.

<referenceBlock name="checkout.cart.item.renderers.default">
    <arguments>
        <argument name="view_model" xsi:type="object">OrangeCompanyCatalogViewModelMyNewViewModel</argument>
    </arguments>
</referenceBlock>

Reference: https://devdocs.magento.com/guides/v2.4/extension-dev-guide/view-models.html

Because on phtml file it was only possible to use $block->getViewModel() when we use name="view_model" otherwise we couldn't access this instance using get() instead of that we may have to use getData('unique_name').

In your sample code, I notice that <referenceBlock name="product_additional_data"> but I think it should be <referenceBlock name="product.additional.data"> as per the M2 Docs and also it should be the same name where that you refer the block name.

Cheers!

Murtuza Zabuawala · Answer

instead of view_model please write viewModel + CustomProductModelViewModelLocaleInfo

Rajeev K Tomy · Answer

This is the block you are referencing in your layout handle XML file. You are referencing this block with its alias name; i.e, product_additional_data which is wrong. You should refer it with its name; i.e, product.info.product_additional_data. So you should change your code like this: + CustomProductModelViewModelLocaleInfo After this changes made please clear your cache and then you are good to go. EDIT Your layout update XML file location also seems wrong. It should be like: app/design/frontend/Custom/Theme/Magento_Review/layout/review_product_list.xml

$block->getViewModel() returning NULL

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