Extending entities
We extend entities by adding additional attributes to them. Referring back to the magical getter and setter methods mentioned in the context of Magento\Framework\DataObject, the logical thinking might be: what's the big deal; can't we just add new database columns via UpgradeSchema and use magical getter and setter methods to go around it? The answer is both yes and no, but mainly leaning toward no – we will soon learn why.
To better explain this, let's take a look at Magento\Sales\Model\Order, the entity model. This model implements the Magento\Sales\Api\Data\OrderInterface interface, which further extends Magento\Framework\Api\ExtensibleDataInterface. Here, we can see a constant defining a key for the extension attributes ...
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