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I created a custom category multiselect attribute. (it's even a custom source but that does not matter).

Everything is OK on save, admin forms OK, even the flat contains my values. ( thx to https://github.com/magento/magento2/issues/417 )

BUT, when i do a list/get on front through repository, my category object does not have the values... (flat is activated)

I found an event in \Magento\Catalog\Model\ResourceModel\Category\Flat

// Allow extensions to modify select (e.g. add custom category attributes to select)
$this->_eventManager->dispatch('catalog_category_flat_loadnodes_before', ['select' => $select]);
  • Is that the only way ? It seems weird to me when i think about the XML of Magento 1.
  • Do i have to modify anything else ?

edit: Even with flat disabled, i can't get it...

edit2: ok, i'm stupid. A part of the problem was because i was in \Magento\Catalog\Helper\Category function canShow , and it uses a "hard coded" collection through the getCategoryTree function . Hooray, another plugin to write. The funny thing is that i know have a string instead of an array through get. As if the afterLoad was not called... Another mystery...

But then... the observer i gave. What is its purpose ?

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Doing a search for the event name revealed that it isn't actually used anywhere in the system. So, the best guess I have is what I can ascertain from the comment: the core team wants to expose a way to add custom attributes to the select.

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