By fago on
Change record status: 
Published (View all published change records)
Project: 
Entity API
Introduced in branch: 
7.x-1.x
Introduced in version: 
7.x-1.2
Issue links: 
https://www.drupal.org/node/1980412
Description: 
+ * - extra fields controller class: (optional) A controller class for providing
+ *   field API extra fields. Defaults to none.
+ *   The class must implement the EntityExtraFieldsControllerInterface. Display
+ *   extra fields that are exposed that way are rendered by default by the
+ *   EntityAPIController. The EntityDefaultExtraFieldsController class may be
+ *   used to generate extra fields based upon property metadata, which in turn
+ *   get rendered by default by the EntityAPIController.

Watch out, if you enable to default extra field controller some entity properties might be rendered by default. So if you do that for existing entity types, take care!

Impacts: 
Module developers