<?php namespace SilverStripe\ORM\Tests\ManyManyThroughListTest; use SilverStripe\Dev\TestOnly; use SilverStripe\ORM\DataObject; class PolyJoinObject extends DataObject implements TestOnly { private static $table_name = 'ManyManyThroughListTest_PolyJoinObject'; private static $db = [ 'Title' => 'Varchar', 'Sort' => 'Int', ]; private static $has_one = [ 'Parent' => DataObject::class, // Polymorphic parent 'Child' => PolyItem::class, ]; }