[Setup Scripts] Adding Order Attributes (Pseudo EAV)

[sprankhub]

By #51 and the related videos, most of the important topics of adding EAV attributes seem to be covered. However, I had a hard time adding an order attribute. Theoretically, order is an EAV entity as well. However, practically, it is just a pseudo EAV entity (at least in Magento Open Source). Through Magento\Sales\Setup\SalesSetup, the "EAV" attributes are actually mapped to flat tables. So you cannot use Magento\Eav\Setup\EavSetup to add order attributes. You have to use the SalesSetup for that. This is worth a short video I think :-)

[Vinai]

Thanks, yes, you are right!
Legacy everywhere!