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For products in the admin, I need to have a custom attribute which contains the list of countries. It needs to be multiselect.

I created a multi select attribute in the admin, left the options blank, and in the database changed the source_model to 'Magento\Catalog\Model\Product\Attribute\Source\Countryofmanufacture'

This appeared correctly on a product page in the admin, however when selecting one or more countries and saving, the countries do not save.

What am I doing wrong?

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If you have done all steps you described, it should work.

The condition to make it works is your attribute has:

  • backend_model value is Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend.
  • backend_type value is text (default value) or varchar.
  • frontend_input value is multiselect.
  • source_model value is Magento\Catalog\Model\Product\Attribute\Source\Countryofmanufacture

You can run this SQL query to check if all properties are correct:

SELECT `attribute_id`, `attribute_code`, `backend_model`, `backend_type`, `frontend_input`, `frontend_label`, `source_model` FROM `eav_attribute` WHERE `source_model` = 'Magento\\Catalog\\Model\\Product\\Attribute\\Source\\Countryofmanufacture'

It should show the result like the screenshot below: enter image description here

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  • Thanks, I was missing something there. Additionally I found I needed to either clear the cache or reindex the site in order for the save to work (did both at the same time).
    – jaybong
    Commented Nov 24, 2022 at 2:18
  • @jaybong Great. Glad to help!
    – Tu Van
    Commented Nov 24, 2022 at 3:37

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