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Magento 2: Dependency Injection and API Calls


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This one came out of a conversation in my Patreon mentoring Slack room. Someone was having trouble with their Magento 2 object manager configurations (di.xml) not showing up — but only during checkout. Their problem? They were dropping their di.xml files into the frontend folder


This is good enough to get class preferences and plugins set for the page that renders the checkout, as well as any pages that make ajax requests through a frontend controller. However — the stock Magento checkout application also accesses Magento’s rest API directly, and rest API requests happen in a custom area call webapi_rest. This means di.xml configuration needs to go into


if Magento’s making a rest request via javascript/ajax and you want your code to run during that request.

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Originally Posted: 14th November 2017