There is no necessity to change any PHP code for doing this. You just need to create `{MODULE_NAME}/etc/catalog_attributes.xml` with such content: <?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Catalog:etc/catalog_attributes.xsd"> <group name="quote_item"> <attribute name="sample_attr"/> </group> </config> After that apply a commands like: php bin/magento setup:upgrade after that regenerate your static content by running the following command php bin/magento setup:static-content:deploy at last apply permission chmod -R 777 var pub