silverstripe-framework/tests/php/ORM/DataObjectTest/SubTeam.php

<?php

namespace SilverStripe\ORM\Tests\DataObjectTest;

use SilverStripe\Dev\TestOnly;

class SubTeam extends Team implements TestOnly
{
	private static $table_name = 'DataObjectTest_SubTeam';

	private static $db = array(
		'SubclassDatabaseField' => 'Varchar'
	);

	private static $has_one = array(
		"ParentTeam" => Team::class,
	);

	private static $many_many = array(
		'FormerPlayers' => Player::class
	);

	private static $many_many_extraFields = array(
		'FormerPlayers' => array(
			'Position' => 'Varchar(100)'
		)
	);
}