<?php namespace SilverStripe\ORM\Tests\DataObjectTest; use SilverStripe\Dev\TestOnly; use SilverStripe\ORM\DataObject; class Fan extends DataObject implements TestOnly { private static $table_name = 'DataObjectTest_Fan'; private static $db = array( 'Name' => 'Varchar(255)', 'Email' => 'Varchar', ); private static $has_one = array( 'Favourite' => DataObject::class, // Polymorphic relation 'SecondFavourite' => DataObject::class ); }